TOUCH SENSOR TYPE: B6TS-08NF USER MANUAL
Contents
1. 2 3 Anexample circuit Mid B T OENF cuoc 1 TESTO RESET RESET TESTI MEAS HEAS OUTO DUTI SCK BUTI sCK OUT3 HOSI DUT2HOSI DUTY MEC BuraAisa SETUP SETUP QUTA aura lt OUTS BUTE our lt Burr Note 1 Connect Rr Cr Rc and Cc to each touch electrode as shown in the above figure Refer to the design tool BGTW Workbench for their actual values Rr0 7 Protective resistors Cr0 7 Capacitors for comparison 0 3 Resistors for charge control 0 3 Charge capacitors Md em Reo n m Rri cht Fr cha ore P ER Rei Cel NA Rr3 25 24 Rrd cha crt ra 2 52 E Est T m B Ch5 a RrT Ch Note 2 Connect a bypass capacitor of about 0 1 uF between Vdd and Vss using as short wires as possible 3 Operating modes This chip has three operating modes Each mode is selected by inputs to the MEAS pin and SETUP pin 1 Normal measurement mode Mode to detect touch no touch In this mode one of the following modes can be selected according to the output signal form 1 1 On off output mode Out0 3 signals are used Touch no touch detection results are output from the respective channels with low high signal 1 22. 110305 Package surface temperature Time sec Fig 1 Reflow method temperature profile Wave soldering method known as flow soldering or dip soldering Number of times Once Temperature The temperature profile is shown in Fig 2 The optimum preheating temperature must be set according to the type of flux 10s Primary and secondary flux passing time Solder temperature Number of times once 80 1506 Package surface temperature Temperature C Time sec Fig 2 Wave soldering method temperature profile Soldering iron manual soldering Solder using a soldering iron for semiconductor devices under the following conditions Iron tip temperature higher than 370 C Soldering time No longer than 5 sec pin Recommended wash conditions When using rosin flux wash check the following items 1 Amount of contamination containing residual ions or no ions 2 Administrative directions and regulations 3 Melting resistance of parts Handling after mounting parts on PWB When dividing a PWB on which ICs are mounted do not apply any excessive force to the ICs Otherwise the internal IC chips may be broken Applied voltages and currents 1 Do not apply to any pin any voltage or current that exceeds the maximum absolute rating 2 Use the device within the recommended specifications to enhance the quality of the device 3 Do not apply any forward bias to any of the pins Other
3. Command code 0x16 Channel 3 CHYS3 Command code 0x19 Channel 4 CHYS4 Command code 0x1C Channel 5 CHYS5 Command code Ox1F Channel 6 CHYS6 Command code 0x22 Channel 7 CHYS7 Command code 0x25 6 2 7 CHEN Measurement enable for each channel read write enabled only in setup mode Whether or not measurement 15 executed in each channel is set with 1 0 1 measurement executed 0 not executed Only lower order 4 bits are valid If the other bits are written they are ignored M B 10 8 7 6 5 4 3 2 1 0 Ch7 Ch6 Ch5 Ch4 Ch3 Ch Ch Ch 1 1 1 1 1 2 110 Command code 15 12 9 0x39 6 2 8 TCAL Teaching measurement count read write enabled only in setup mode Sets the measurement count when teaching Teaching measurement is executed 32 times the value of TCAL The teaching operation must be performed during this period each electrode must be touched three times or more Reference value REFx quantity of variation judged as on THRx and hysteresis HYSx changed by teaching When TCAL is set to 0 only the reference value THRx is changed in teaching Only lower order 8 bits are valid If the other bits are written they are ignored Command code 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 a 6 2 9 Toggle action read write enabled only in setup mode Sets whether or not to make each channel perform toggle action This setting takes effect on the signals output from OUTO 3 command data
4. Hysteresis of each channel This parameter sets the hysteresis value in teaching approximate value On judgment ratio Refer to 6 2 17 RTHRx On judgment ratio for each channel amp Hysteresis ratio Refer to 6 2 17 RHYSx Hysteresis ratio for each channel These parameters set the ratios of the quantity of variation judged as on THRx and hysteresis HYSx to the variation of the measured value caused by touch During teaching each electrode must be touched three times or more Then the minimum value of the quantity of variation caused by touch is calculated for each electrode of the chip Minimum value of quantity of variation The new quantity of variation judged as on and the new hysteresis are calculated using the minimum value of quantity of variation AA as Quantity of variation judged as on THRx AAx On judgment ratio RTHRx 1 16 Hysteresis HYSx AAx Hysteresis ratio RHYSx 16 Measured value manna Touch on electrode THRx AAx On judgment ratio RTHRx 1 16 AA HYSx AAx Hysteresis ratio RHYSx 16 Time 7 3 7 4 Performing teaching There are two ways to enter teaching mode 1 SETUP pin low and MEAS pin high 2 Write 0 into bit15 TS using the MODE command in setup mode When entering teaching mode by method 1 set the SETUP pin to high or the MEAS pin to low before teaching finishes If SETUP pin high and the MEAS pin low teaching will commence again Wh
5. Serial communication mode Measured results are transmitted in serial with a three wire SPI function using SCK SD and SCS signals 2 Setup mode Chip operation is set for serial communication in this mode 3 Teaching mode Teaching refers to the automatic setting of threshold values for touch and no touch while somebody touches the sensor SETUP pin MEAS pin Operation mode High High Normal measurement mode Normal measurement mode standby status without High Low executing measurement Low High Teaching mode Low Low Setup mode MEAS pin High or MODE command bit15 0 Tea L Teaching finish and SETUP pin Low SETUP pin Low and High MEAS pin High SETUP pin Low and MEAS pin Low Teaching finish and SETUP pin High Normal measurement mode Setup mode is entered and MODE command bit0 0 On off output mode O gt communication mode Setup mode is entered and MODE command bit0 1 Measurement The chip measures the discharge of the charge stored in the charge capacitor When a finger is placed close to the touch electrode the electrostatic capacitance of the electrode increases and the discharge period for the charge becomes shorter The chip has a built in counter to measure the discharge period and whether or not the sensor has been touched is judged according to whether the length of the discharge peri
6. 1 Toggle mode off momentary action turned on only with a touch 0 Toggle mode on alternate action turned on with a touch and off with the next touch Only lower order 4 bits are valid If the other bits are written they are ignored Command code 15 14 13 12 11 10 9 8 7 6 3 4 3 2 1 Ox3B Ch7 Ch6 Ch5 Ch4 Ch3 Ch Chl Ch 1 1 1 1 1 1 1 2 0 6 2 10 ACD Cumulative judgment count read write enabled only setup mode Only after consecutive measurement ACD value one times a touch or no touch is judged and this output is varied This output takes effect on the signals output from OUTO 3 and BDATA command data For example with ACD 2 only after three consecutive measurements are judged as a touch or no touch does this output signal turn on or off Only lower order 8 bits are valid If the other bits are written they are ignored Command code 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 LL O OO 6 2 11 SLP Sleep time read write enabled only in setup mode Sets the standby time between one measurement and the next measurement sleep time Sleep continues for SOP valuex10mS typ When SLP is set to 0 measurements are made consecutively without sleep time Only lower order 8 bits are valid If the other bits are written they are ignored Command code 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 LT DDTTTTFFFFFFF 6 2 12 MODE Operation mode read write enabled only in setup mode Sets various mod
7. 4 5 5 5 V Vin High input voltage 0 8Vaa Vad V Low input voltage 0 0 2V aa V High output voltage 5 mA Low output voltage 5 mA Note 1 Unless otherwise specified Vdd 4 5 5 5V Topr 20 85 C Electrical characteristics Designation Item Condition Rated value Unit Minimum Standard Maximum High Output voltage lon SmA Vaa 2 0 Vad V Vor Low Output voltage 2 2 0 V In High Input voltage V 5V 5 uA In Low Input voltage V 0V 5 pA Supply voltage Normal measurement 4 mA mode Number of times of 0 60 10000 Times EEPROM write EEPROM write time Va4 5 V Toprr 25 C 0 3 S Note 2 EEPROM data retention Topr 55 C 20 Years period Note 1 Unless otherwise specified Vdd 4 5 5 5V Topr 20 85 C Note 2 The period following receipt of the EEPROM write command in setup mode until the data write finishes Necessary timing conditions Designation Item Condition Rated value Unit Minimum Maximum tesck Serial communication clock cycle time 8650 nS tw SCKH Serial communication clock high pulse width 100 nS tw SCKL Serial communication clock low pulse width 100 nS tao Serial communication output delay time 80 ns 50 Serial communication output hold time 0 nS 5 Serial communication input setup time 35 ns tnis Serial communication input hold time 90 ns Serial communication byte to byte interva
8. 8 channels 0 1 Cr 18pF For all 8 channels Cc 0 14F Rc 5 6k2 Vdd 5V Topr 20 C Vdd 5V Topr 20 C Cr 10pF Cr 15pF Cr 18pF Cr 22pF Cr 33pF for all 8 channels finish ms The time that elapses before the measurements for all 8 channels finish ms The time that elapses before the measurements Temperature characteristics Cc 0 1pF Cr 18pF 5 6 Cx 4pF Vdd 5V Measured value 40 20 0 20 40 60 80 100 Temperature 9 Supply voltage characteristics Cc 0 1pF Cr 18pF 5 6 Cx 4pF Topr 20 C 160 140 120 100 gt 80 Z 60 40 20 0 3 4 5 6 7 Supply voltage Vdd V Appearance and dimensions T Eno Recommended pad dimensions 5 1 Note 1 Dimensions do not include burrs or dye bars 2 Pins are plated with Sn Cu Detailed dimensions of section A 10 1 Warranty Details 1 Warranty period The warranty period for an Omron product is one year from purchase or delivery to a customer specified place 2 Scope of warranty If any Omron product fails under Omron liability within the above warranty period Omron shall supply a replacement or repair the product free of charge at the place of purchase However if the reason for the product failure falls
9. Command code 0x05 Channel 4 DCH4 Command code 0x06 Channel 5 DCH5 Command code 0x07 Channel 6 DCH6 Command code 0x08 Channel 7 DCH7 Command code 0x09 6 2 4 CREFx Current reference value for each channel read only Current reference value for each channel is indicated by an unsigned 16 bit integer Command code 15 va aa Channel 0 CREF0 Command code 0x0E Channel 1 CREF1 Command code 0x11 Channel 2 CREF2 Command code 0x14 Channel 3 CREF3 Command code 0x17 Channel 4 CREF4 Command code 0x1A Channel 5 5 Command code 0x1D Channel 6 CREF6 Command code 0x20 Channel 7 CREF7 Command code 0x23 6 2 5 CTHRx Current variation for each channel judged as read only Current variation for each channel judged as on is indicated by an unsigned 16 bit integer Command code 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 EZ PPP PEE Channel 0 CTHR0 Command code 0x0F Channel 1 CTHR1 Command code 0x12 Channel 2 CTHR2 Command code 0x15 Channel 3 CTHR3 Command code 0x18 Channel 4 CTHR4 Command code 0x1B Channel 5 CTHR5 Command code Ox1E Channel 6 CTHR6 Command code 0x21 Channel 7 CTHR7 Command code 0x24 6 2 6 CHYSx Current hysteresis for each channel read only Current hysteresis for each channel is indicated by an unsigned 16 bit integer Command code 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 oe PPP eT T Channel 0 CHYSO Command code 0x10 Channel 1 CHYS1 Command code 0x13 Channel 2 CHYS2
10. into any of the following categories the warranty will not apply a The product has been used or handled under conditions or in an environment not listed in the product s specifications catalog or operation manual hereinafter referred to as the catalog and the like b The failure has been caused by a non Omron product c The product has been modified or repaired by somebody or corporation other than Omron d The product has been used for other than its intended use e The failure could not have been predicted based on the level of science or technology at the time of shipment f The failure has been caused by a natural or other disaster an accident or the like that is not Omron s liability This warranty applies only to the Omron product itself and any damage induced by a failed Omron product is excluded from this warranty 3 Scope of service The price of an Omron product does not include service expenses such as the cost of sending out technicians If you wish to request non inclusive services please consult Omron sales personnel 4 Scope of application The above apply only to business and usage in Japan Please consult Omron sales personnel about business and usage in other countries
11. OMRON TOUCH SENSOR 6 5 08 USER MANUAL OMRON KURAYOSHI Co Ltd 2773681 0A Introduction Thank you very much for purchasing the touch sensor The touch sensor is a product that has been developed based on Omron s advanced technology and rich experience This user manual describes the information necessary for use of the sensor such as its functions capabilities and proper usage When using the touch sensor please keep the following in mind Only specialists with knowledge of electricity must handle the touch sensor Please read and understand the contents of this manual thoroughly to use the touch sensor appropriately Keep this manual handy to refer to at any time you need it Points to note when using the touch sensor e Although Omron makes constant efforts to improve the quality and reliability of its semiconductor products products such as this touch sensor may malfunction or break Before using the touch sensor please contact Omron s business development personnel if necessary to confirm product specifications while also paying attention to using the sensor with a sufficient margin allowed for its ratings and capabilities and taking safety measures such as installing safety circuits to minimize hazards in the unlikely event that a failure of the sensor might occur Basically this product is not designed and manufactured for use in equipments or systems operated under pot
12. ade to write read only data the operation will be invalid Some of the data are not accessible in some operation modes If inaccessible data are read out the read data is indefinite If inaccessible data are written the data is ignored Command code Designation Main function Read write Access restriction restriction Normal measurement Setup mode mode in serial communication mode 0x00 ID 0x25 CHYS7 Measured data Read only Accessible Accessible 0x39 CHEN 0x67 RHYS7 Parameter setting Read write Inaccessible When writable data are written in this chip the built in register corresponding to each command is rewritten Then if the normal measurement mode is entered the chip can be operated with the written parameters mode etc In this case because only the built in register is rewritten the value in each register returns to its original value value stored in EEPROM when power is turned off and on again To store the built in register value in EEPROM an EEPROM write command must be received When an EEPROM write command is received the content of the register is stored in EEPROM 6 1 List of commands Command Desig Description Access limit Remark code nation o H 5 H 2 2 S o S E 8 v2 E 2 SE 58 2 2 0x00 ID Chip ID R o o 0x01 BDATA Detected result of each channel R 1 channel 1 bit 0
13. aired accumulated electrostatic charges may damage the product or the electrode may corrode Adopt a structure that covers the surface of the touch electrode with nonconductive material and does not allow anybody to touch the metal part of the electrode directly The recommended thickness for the nonconductive material 15 Resin material dielectric constant of 2 to 3 no more than 2mm Glass material dielectric constant of about 5 no more than 4mm Proper usage 1 Method of transportation and storage 1 Do not drop or apply any shock to the touch sensor because it is a precision device If the sensor is thrown or dropped it may break 2 When carrying or storing the touch sensor keep its packaging properly oriented If the packaging is placed upside down or tilted the sensor may be subjected to some undue force and may break 3 Store the touch sensor under the following conditions to prevent the package from absorbing moisture Otherwise the sensor may break when the package is mounted Storage conditions A Before opening the moisture proof pack aluminum laminate pack Temperature humidity 5 40 20 80 RH Term of validity One year When the sensor 15 used after a long period of storage make sure that no damage dirt or rust Is present on the pack B After opening the moisture proof pack aluminum laminate pack Until the package is mounted the following conditions are recommended for storage of
14. dged as on can be set automatically through actual touches on the electrode This operation is called Teaching When teaching the reference value REFx quantity of variation judged as on THRx and hysteresis HYSx are updated appropriately and stored in the EEPROM built into the chip Before performing a teaching operation some preparation is required The processing flow 15 as follows During teaching serial communication is not available However checking the CHG pin allows status to be checked Once teaching mode is entered any input other than RESET is invalid until the measurement finishes and the chip comes out of teaching mode Be aware that serial communication cannot be performed concurrently Parameter setting preparation Quantity of variation judged as on THRx approximate value Hysteresis HYSx Teaching measurement count TCAL On judgment ratio RTHRx Hysteresis ratio RHYSx MEAS pin high SETUP pin low or MODE command 15 bits 1 Calculate REFx and HYSx and store in Ri Teaching ends State of CHG pin indicating teaching status High T Low During this period touch each electrode at least three times Low 7 2 Preparation for teaching perform teaching this chip must be brought into setup mode and some parameters must be set The parameters commands associated with teaching are as follows 7 2 1 7 2 2 7 2 3 7 2 4 T
15. e 0x50 Channel 4 THR4 Command code 0x55 Channel 5 THR5 Command code 0x5A Channel 6 THR6 Command code Ox5F Channel 7 THR7 Command code 0x64 6 2 16 HYSx Hysteresis for each channel read write enabled only in setup mode Hysteresis for each channel can be set with an unsigned 16 bit integer Users can alter this setting in setup mode or rewrite it by teaching It cannot be changed by drift correction or the like Command code va Oe TT LT Channel 0 HYSO Command code 0x42 Channel 1 HYSI Command code 0x47 Channel 2 HYS2 Command code 0x4C Channel 3 HYS3 Command code 0x51 Channel 4 HYS4 Command code 0x56 Channel 5 55 Command code 0 5 Channel 6 HYS6 Command code 0x60 Channel 7 HYS7 Command code 0x65 6 2 17 RTHRx On judgment ratio for each channel read write enabled only in setup mode Used in teaching Sets the ratio of the quantity of variation judged as on THRx to the measured value observed in teaching with an unsigned 4 bit integer Refer to 7 Teaching for details Only the lower order 4 bits are valid If the other bits are written to they are ignored If the measured value changes by AA due to a touch during teaching the quantity of variation judged as on that is newly set in teaching THRx 15 calculated as Quantity of variation judged as on THRx AA X on judgment ratio RTHRx 1 16 For example if RTHRx 10 the quantity of variation judged as on i
16. eaching measurement count Refer to 6 2 8 TCAL Teaching measurement count During teaching measurement is executed x number of times where x 15 the value of this parameter x 32 Hereafter this is referred to as the teaching measurement count It takes 30 100 msec for one teaching measurement depending on external circuit constants and if this parameter is set to 10 the touches must be executed within 10 30 seconds Unless each electrode is touched three times within the number of teaching measurements after starting teaching the teaching is regarded as faulty and none of the parameters are updated However when this parameter is set to 0 only the reference value REFx is updated In this case no touching is required and the teaching is not regarded as faulty even if no touches are executed Quantity of variation judged as on Refer to 6 2 15 THRx Quantity of variation judged as on This parameter contains the quantity of variation of the measured value that will allow judgment of a touch approximate value To distinguish between variation of the measured value caused by a noise or the like and variation caused by touching during teaching this parameter must be set to an approximate value If variation of half of this set value occurs during teaching the electrode is judged touched Therefore an approximate value for variation likely to have been caused by touch may be entered Hysteresis Refer to 6 2 16 HYSx
17. ed 0x18 CTHR3 PUE Ch3 variation judged as o o Result of drift correction is reflected n 0x19 CHYS3 Current Ch3 hysteresis value R o o Result of drift correction is reflected OxlA CREF4 Current reference value R o o Result of drift correction is reflected Ox1B CTHR4 Current Ch4 variation judged as R o o Result of drift correction is reflected On Ox1C CHYS4 Current Ch4 hysteresis value R o o Result of drift correction is reflected 0x1D CREF5 Current Ch5 reference value R o o Result of drift correction is reflected 0x1E CTHR5 Current Ch5 variation judged as R o o Result of drift correction is reflected On 0x1F CHYS5 Current Ch5 hysteresis value R o o Result of drift correction is reflected 0x20 CREF6 Current Ch6 reference value R o o Result of drift correction is reflected 0x21 CTHR6 Current Ch6 variation judged as R o o Result of drift correction is reflected On 0x22 CHYS6 Current Ch6 hysteresis value R o o Result of drift correction is reflected 0x23 CREF7 Current Ch7 reference value R o o Result of drift correction is reflected 0x24 CTHR7 Current Ch7 variation judged as R o o Result of drift correction is reflected On 0x25 CHYS7 Current Ch7 hysteresis value R o Result of drift correction is reflected 0x26 System reservation 0x38 0x39 CHEN Channel measurement enable R W 0x3A TCAL Teaching count number R W 0 3 TOG Toggle action R W 0 3 ACD C
18. ed with an SPI compliant method using SCK transfer clock MOSI data reception host B6TS and MISO data transmission B6TS gt host The SPI communication method works as follows Refer to 8 Electrical specifications for specific communication timing etc Operation in SPI slave mode Supply SCK transfer clock from outside e SCK transfer clock is set to high during idling The data is latched at the rising edge of the clock data is MSB first This chip sends receives data using 4 bytes consisting of commands dummy data and data Command 1 byte MSB 1 bit is used for the read write flag Dummy data 1 byte ignored Data 2 bytes Read data flow BGTS host MOSI S BeTS Host Write data flow host B6TS SCK sl le Ppt i MSB 6 4 3 2 LILSB 8 7 6 5 4 3 2 1 LSB MOSI 1 Command 7bit Dummy data 8 bi lt lt Data higher order 8 bit Data lower order 8 bit Host BSTS MISO dummy data 8 bit lt dummy data 8 bit Dummy data 8 bit Dummy data 8 bit B6TS Host If data communication is performed during normal measurement mode the measurement operation stops while the data is communicated After communication finishes measurement restarts Commands The commands and data used in serial communication are listed below The data comprises read only data read and read write data read write If serial communication is m
19. en entering teaching mode the CHG pin changes to high indicating entry to teaching mode Just after teaching has started the chip calibrates the reference value REFx the measured value with no touch The measurement is performed eight times for each electrode and the average of the eight measured values 18 taken as REFx After the calibration finishes the CHG pin output changes to low Do not touch the touch electrode until the CHG pin changes to low After REFx has been calibrated the chip starts the teaching measurement count TCAL X 32 times During this period touch each electrode three times or more The order for touching each of the electrodes is not defined After the specified number of teaching measurements have finished the CHG pin changes to high However if the number of touches the number of times the chip recognizes a touch reaches 32 the chip finishes measuring and changes the CHG pin to high even if the teaching measurement count has not been reached When touching the electrodes do not touch two or more electrodes at the same time If you do teaching cannot be performed correctly If more than one electrode is touched simultaneously error touch each of the electrodes touched simultaneously again Touch all of the electrodes three times or more within the teaching measurement time After the touch measurements have finished the chip updates the quantity of variation judged as on THRx and hysteresis HYS
20. entially hazardous conditions If you intend to use the touch sensor with any of the following systems facilities or equipment be sure to consult Omron sales personnel or an agent or dealership first A Atomic power control equipment incineration facilities railroads aircraft vehicle equipment medical appliances amusement machines safety devices and facilities that must comply with the regulations of administrative agencies and their respective industries B Systems machines and devices that are potentially hazardous to humans and property C Other usages that require a high degree of safety The technical information contained in this manual is prepared only to describe typical performances and application examples of the product Application of the products based on the information does not infer the grant of any Omron or third party intellectual property right or license 1 Preventing malfunction caused by contact with an electric conductor other than a human finger with the touch electrode Because this product measures the electrostatic capacitance of the detector electrode the product may operate if something other than a human finger is brought into contact with the electrode Therefore a fail safe design is required for use of the product so that it does not cause any functional or safety problem even on such occasions Substances etc that may cause a malfunction if they are present near to or on the detector are e Wate
21. es Only the bits described are valid If the other bits are written they are ignored Command code 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 TS Teaching start Teaching mode is entered when 0 is written in this bit During read out this bit is always 1 TER Teaching error flag Set reset according to result of teaching Set to 17 when teaching finishes normally If a teaching error occurs this bit is set to 0 This flag is not cleared automatically To clear this flag write 1 to this bit DC Drift correction Sets whether or not to execute drift correction 1 Drift correction executed 2 Not executed CHG pin function The signal 1s specified from the CHG pin in normal measurement mode serial communication mode With this pin set to 1 when on off changes in any channel when any channel is touched comes on or changes from touch to no touch goes off the signal 1s high When this pin is set to 0 the signal is high every time a measurement finishes CON Output setting Sets output mode in normal measurement mode When set to 1 on off output mode is entered When set to 0 serial communication mode is entered 6 2 13 ROMSTR EEPROM write only write is enabled in setup mode When this command is issued by setting the data to 0x5354 all the parameter data are written in the EEPROM built in this chip When the data is other than 0x5354 this command is ignored Until this command
22. g handling Keep the relevant electric equipment work bench and worker at the same potential Lay a conductive mat with a surface resistance of 10 kO 10 MO on the work bench and ground the mat The worker must make sure that there is no electric leakage from the electric equipment and ground himself herself through a resistor of about 1 for safety safety regulations must be observed Any electric leakage from the electric equipment is undesirable from the viewpoint of worker safety Check to be sure that there is no electric leakage from the tester curve tracer oscilloscope or the like and then ground the equipment Any electric leakage can break the MOS The same precautions apply to soldering irons 3 Recommended soldering conditions Temperature conditions for mounting the IC chip 1 2 3 When mounting the IC chip at a high temperature using reflow soldering the melting temperature of the solder depends on the mounting board and paste adhesive materials Referring to the mounting temperature profile shown in Fig 1 choose the optimum soldering temperature within the profile Reflow method infrared light reflow and air reflow Number of times Up to three times Complete the last reflow under storage condition B in Section 1 Temperature The surface temperature profile of the device is shown in Fig 1 260 C max 255 C or higher 10 16 sec max 220 C or higher 60 sec max 175157
23. hing 0x58 RHYS4 Ch4 hysteresis ratio R W o Used in teaching 0x59 5 Ch5 reference value R W 0 5 THR5 Ch5 variation judged as on R W 0 5 HYS5 Ch5 hysteresis R W 0x5C RTHR5 Ch5 On judgment ratio R W o Usedin teaching 0x5D RHYS5 Ch5 hysteresis ratio R W o Used in teaching 0 5 REF6 Ch6 reference value R W 0 5 THR6 Ch6 variation judged as on R W 0 60 HYS6 Ch6 hysteresis R W 0 61 RTHR6 Ch6 On judgment ratio R W Usedin teaching 0x62 RHYS6 Ch6 hysteresis ratio R W o Used in teaching 0x63 REF7 Ch7 reference value R W 0 64 THR7 Ch7 variation judged as on R W 0 65 HYS7 Ch7 hysteresis R W 0 66 7 Ch7 On judgment ratio R W o Usedin teaching 0x67 RHYS7 Ch7 hysteresis ratio R W o Used in teaching 0x68 Ox7F System reservation 6 2 Description of commands 6 2 1 ID Chip ID read only Used as ID of the chip The data is fixed to 0x018 Command code 6 2 2 BDATA Detection result of touch no touch for each channel read only Measured value for each channel is indicated by 1 0 1 Off no touch 0 On touch Command code 15 6 2 3 DCHx Measured value for each channel read only Measured value for each channel is indicated by an unsigned 16 bit integer Command code 15 e TEPP Channel 0 DCH0 Command code 0x02 Channel 1 DCH1 Command code 0x03 Channel 2 DCH2 Command code 0x04 Channel 3 DCH3
24. is issued received write data are stored in volatile memory While data is being written in EEPROM the CHG pin is low Also during the write inputs to the SETUP and MEAS pins are ignored Accordingly it is not possible to change the operation mode Command code 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 SN dL 6 2 14 REFx Reference value for each channel read write enabled only in setup mode The reference value for each channel can be set with an unsigned 16 bit integer Users can alter this setting in setup mode or rewrite it by teaching It cannot be changed by drift Dp e zr x Command code oo OT EET Channel 0 REF0 Command code 0x40 Channel 1 Command code 0x45 Channel 2 REF2 Command code 0x4A Channel 3 REF3 Command code 0x4F Channel 4 REF4 Command code 0x54 Channel 5 REF5 Command code 0x59 Channel 6 REF6 Command code 0 5 Channel 7 REF7 Command code 0x63 6 2 15 THRx Quantity of variation judged as on for each channel read write enabled only in setup mode Quantity of variation judged as on for each channel can be set with an unsigned 16 bit integer Users can alter this setting in setup mode or rewrite it by teaching It cannot be changed by drift correction or the like Command code 15 0 41 dens D7 EEE D6 JEE EER xj Channel 0 THRO Command code 0x41 Channel 1 THR1 Command code 0x46 Channel 2 THR2 Command code 0x4B Channel 3 THR3 Command cod
25. l 70 us tw CD Serial communication command reception 265 uS interval TwcHo CHG pulse width Note 2 85 uS Tsu SETUP Mode shift delay time Note 3 150 uS TWRESET Reset pulse width 500 uS Note 1 Unless otherwise specified Vdd 4 5 5 5V Topr 20 85 C Note 2 This is the time period when the condition that CHG pulse width is at its minimum in the serial communication mode of normal measurement mode is set CHG pin function is set to output at the end of every measurement CHG bit 0 with MODE command and the sleep time is set to zero SLP command value 0 Note 3 The delay time for the mode shift between normal measurement mode and setup mode SCK MISO SCK MISO MOSI te 5ck Tw SCKH tu SCKL tarso th 50 tsusi thesi __tcisck tweed mc 1 2 3 4 5 6 7 8 8 10 11 12 13 141516 17 18 18 20 21 22 23 24 25 26 27 28 29 30 31 32 ee Command Dummy data Data 1 NN IL SETUP CHG tsu sETUP lt lt 85 Measurement characteristics typical example Measured value Cc 0 1 Cr 18pF Vdd 5V Topr 20 C Measured value Cc 0 1 Rc 5 6kO Vdd 5V Topr 20 C 800 300 700 Ro 1kQ 200 600 Rc 2 2kQ 560 Rc 4 7k 9 Rc 6 8kQ Rc 10kQ Re 15kQ Rc 22kQ 150 Measured value Measured value Measurement time Measurement time For all
26. od exceeds a specified value or not Hereafter the length of the discharge period is referred to as the measured value With this chip the measured value when the sensor is not touched reference value the amount of variation of the measured value which allows a judgment that the sensor 1s touched amount judged on and the amount of variation of the measured value when returning from on status hysteresis can be set for each channel respectively The relationships between the measured value and the above values are as follows Measured value lt Reference value Variation judged on Touch Measured value gt Reference value Variation judged on Hysteresis Return from touch to no touch Measured value mu Touch on electrode Reference value Amount of variation allowing a touch judgment mn 4 Hysteresis Time Touch judged Even inthe touched state the measured value changes according to variation in the environment output drift The chip is provided with an automatic drift correction function which can cancel mild changes of the measured value due to variation in the environment drift correction function It is possible to select whether or not to execute drift correction in setup mode Serial communication It is possible to read out measured values and set the operation mode by sending receiving data to from this chip through serial communication Serial communication is perform
27. onnect to Vdd through a pull up resistor Note 2 Pin Vref is provided to stabilize internal power When using this pin connect it to Vss through a capacitor of about 0 1 pF 2 2 Pin functions Pin Desig Input E No nation Output unction Indicates the chip s operational status Normal measurement mode Outputs when measurement 15 complete Two output modes are available 1 High signal output every time a measurement finishes 1 CHG 2 High signal output when the condition changes in any one of the channels touch no touch no touch touch Setup mode When setup mode is entered CHG pin is high However when EEPROM write command is received and data 1s being written in EEPROM CHG pin is low 2 TESTO Connect to Vss through a pull down resistor Reset signal input Inputting low to this pin resets the chip Connect this pin to VDD through a pull up resistor of about 5 When VDD starts 3 RESET up the power on reset function operates and the chip is initialized When the power on reset function is used no other reset signal is needed when power is turned on 4 TESTI Connect this pin to Vdd through a pull up resistor 5 21 Vss I Ground Pin Desig Input No nation Output 6 MEAS Initiation of measurement Capacitance measurement is initiated by inputting high to this pin While low i
28. r metal animals other conductive materials 2 Preventing operational error Because this product detects human touch it may operate if the detector electrode 1s touched only lightly or if somebody remains nearby When incorporating this product into a device check the detection range thoroughly and employ measures to prevent the device from malfunctioning caused by operational error Especially 1f the device is used where children may come into contact with it provide some safety measure such as a child safety lock 3 Preventing the entry of water or corrosive gases If water or a corrosive gas enters the operating part of the sensor electrode in the event of a short circuit or corrosion of the electrode the sensor may malfunction or its detection sensitivity may be lowered If the product is supposed to be used in an environment where this may occur employ some structure to prevent the entry of water or gas and check to be sure in actual operation that the device 15 protected securely against such an event 4 Preventing malfunction caused by noise The product may malfunction if subjected to excessive noise Check to be sure that no safety problems are caused by excessive noise 5 Preventing direct touching of the electrode Do not employ any structure that exposes the surface of the touch electrode to the air and allows somebody to touch the metal part of the touch electrode directly Otherwise the safety of the product may be imp
29. s THRx AAx 10 1 16 AAx0 69 about 70 of AA Commandcode 15 14 B 12 l0 9 8 7 6 5 4 2 1 0 Channel 0 RTHR0 Command code 0x43 Channel 1 RTHR1 Command code 0x48 Channel 2 RTHR2 Command code 0x4D Channel 3 RTHR3 Command code 0x52 Channel 4 RTHR4 Command code 0x57 Channel 5 RTHR5 Command code 0x5C Channel 6 RTHR6 Command code 0x61 Channel 7 RTHR7 Command code 0x66 6 2 17 RHYSx Hysteresis ratio for each channel read write enabled only in setup mode Used in teaching Sets the ratio of hysteresis HYSx to the measured value observed in teaching with an unsigned 4 bit integer Refer to 7 Teaching for details Only the lower order 4 bits are valid If the other bits are written to they are ignored If the measured value changes by AA due to a touch during teaching the new hysteresis that is set in teaching HYSx is calculated as Hysteresis HY Sx AAx Hysteresis ratio RHY Sx 16 For example if RHYSx 2 hysteresis HYSx is HYSx AAx2 16 AAx0 13 about 13 of AA Commandcode 15 14 13020100 9 8 6 5 4 3 2 1 0 Channel 0 RHYSO Command code 0x43 Channel 1 RHYS1 Command code 0x49 Channel 2 RHYS2 Command code Ox4E Channel 3 RHYS3 Command code 0x53 Channel 4 RHYS4 Command code 0x58 Channel 5 RHYS5 Command code 0x5D Channel 6 RHYS6 Command code 0x62 Channel 7 RHYS7 Command code 0x67 7 Teaching 7 1 Outline of teaching Such parameters as the quantity of variation ju
30. s input to this pin the chip 1s held in standby status 7 19 Vdd I Supply input 4 5 5 5V 8 O Output pin for channel 0 active low Output pin for measured result 9 OUTI On off output mode channel 1 output active low SCK Serial communication mode serial communication clock input Output pin for measured result 10 OUT2 o On off output mode channel 2 output active low MOSI Serial communication mode serial communication clock input Output pin for measured result 11 OUT3 On off output mode channel 3 output active low MISO Serial communication mode serial communication clock input 12 SETUP I Setup mode Low input to this pin moves the chip into setup mode 13 O Output pin for channel 4 active low 14 lours 0 Output pin for channel 5 active low 15 OUT6 0 Output pin for channel 6 active low 16 our O Output pin for channel 7 active low 17 CH7A 20 CH6A 22 5 25 CH4A vO Measurement pins channel 7 0 26 CH3A Connect these pins to the touch electrode through resistors 29 CH2A 30 CHIA 32 CHOA Iioc EIS Common use measurement pins channel 7 0 24 COM45 Common use measurement pins two channels each Connect these pins to charge capacitors through resistors 31 COM01 4 23 Vref 1 Pin for stabilization of internal power s Connect this pin to Vss through a capacitor of about 0 1 uF 28 TEST2 I Connect to Vdd through a pull up resistor
31. the package Temperature humidity higher than 30 C No more than 70 RH Term of validity One week C Temporary storage after opening the moisture proof pack When storing an unused sensor package temporarily restore the package together with some desiccating agent into a moisture proof bag as early as possible within about 10 minutes fold the opening of the bag in two seal the bag tightly with adhesive tape or the like and keep the bag under the following recommended conditions Temperature humidity 5 40 20 80 RH Term of validity One month 4 Do not use or store the touch sensor where it will be subject to corrosive gases such as hydrosulfuric gas or salt air or exposed to oil or direct sunlight 5 Where either of the following conditions 1 or 2 is applicable baking the sensor package the following manner is recommended in order to remove moisture The tray used in the moisture proof pack can be stored in a high temperature chamber because it 1s heat resistant However place the tray on a flat base such as a level block and then cool it down on the base to prevent deformation after baking 1 The above storage conditions A C are exceeded 2 The color of the 30 RH detection part of the indicator changes to lavender or pink Baking method gt Temperature 125 C Time 20 24 hours Number of times baking Up to three Cumulative time limit 72 hours 2 Measures against electrostatic charges durin
32. umulative judgment count R W 0x3D SLP Sleep time R W 0 3 MODE Operation mode R W 0 3 ROMSTR write o Writing into ROM with dummy write 0x40 REFO Ch0 reference value R W 0 41 THRO Ch0 variation judged as on R W 0 42 HYSO Ch0 hysteresis R W 0 43 RTHRO Ch0 On judgment ratio R W o Used in teaching 0x44 RHYSO Ch0 hysteresis ratio R W o Used in teaching 0x45 REF1 Chl reference value R W 0 46 THRI Chl variation judged as on R W 0 47 HYSI Chl hysteresis R W 0 48 RTHRI Chl On judgment ratio R W o Used in teaching Command Desig Description Access limit Remark code nation 0x49 RHYSI Chl hysteresis ratio R W o Used in teaching 0x4A REF2 Ch2 reference value R W Ox4B THR2 Ch2 variation judged as on R W 0 4 HYS2 Ch2 hysteresis R W 0x4D RTHR2 Ch2 On judgment ratio R W Usedin teaching 0 4 RHYS2 Ch2 hysteresis ratio R W o Usedin teaching 0x4F REF3 Ch3 reference value R W 0 50 THR3 Ch3 variation judged as on R W 0 51 HYS3 Ch3 hysteresis R W 0 52 RTHR3 Ch3 On judgment ratio R W o Usedin teaching 0x53 RHYS3 Ch3 hysteresis ratio R W o Used in teaching 0x54 REF4 Ch4 reference value R W 0 55 THR4 Ch4 variation judged as on R W 0 56 HYS4 Ch4 hysteresis R W 0 57 RTHR4 Ch4 On judgment ratio R W Used in teac
33. wise excessive forward current may cause thermal breakdown of the IC 4 Do not connect any output pin directly to power If any output pin is directly connected to low impedance power the internal wiring may melt down or break thermally due to excessive current CONTENTS lis Overview Pin connections Operation modes Measurement Serial communication Commands Teaching Electrical characteristics Appearance and dimensions Overview This chip is a sensor IC to detect micro capacitances and can be used in touch sensors Internally the chip employs the CMOS process and is contained in a 32 pin QFP plastic package The IC has 8 independent measurement pins each of which can measure capacitance independently On off output or serial communication output can be selected as the output form The IC is provided with an EEPROM that can store operation mode and other parameters Pin connections 2 1 Pin arrangement diagram e c amp 2 255243 ZOITGOITII cGuoocuor ocz3u LL LL ER ERE IT Yd oan we win ca C CJ OC CX CHGrmni e COM4S TESTO 2 Vref RESET 3 5 TESTI 4 Mss Mss 5 CHEA MEAS Vdd Ydd o 7 COM67 8 SETUP OUTI SCK 9 OUT2 MOSI g 1 OUT3IMISO rj Note 1 Pins TESTO 2 are used for testing during manufacture of the IC When using these pins TESTO Connect to Vss through a pull down resistor TESTI and TEST2 C
34. x according to the calculation formula described 7 2 4 On judgment ratio and hysteresis ratio updates the values stored in the built in ROM After the values are updated the CHG pin changes to low and teaching finishes Checking the result of teaching When teaching finishes correctly bit14 TER bit of the data which can be read with the MODE command changes to 1 If teaching is not completed normally because the specified number of touches are not executed within the teaching measurement time or for some other reason the TER bit changes to 0 and the quantity of variation judged as on THRx and hysteresis HYSx are not updated In this event only the reference value REFXx is updated To reset the TER bit set it to 1 using the MODE command or perform teaching again and finish the teaching operation normally 8 Electrical characteristics 8 1 8 2 8 3 8 4 Absolute maximum ratings Designation Item Condition Rated value Unit Vaa Supply voltage 0 3 6 5 V Vi Input voltage 0 3 Vaa 40 3 V Vo Output voltage 0 3 Vaa 0 3 V Py Power dissipation Topr 25 C 300 mW Ambient operating temperature 20 85 Tstg Storage temperature 65 150 C Recommended operating conditions Designation Item Condition Rated value Unit Minimum Standard Maximum Vaa Supply voltage
35. x02 DCHO Ch0 measured value R o 0x03 DCHI Chl measured value R o Jo 0x04 DCH2 Ch2 measured value R 0 05 DCH3 Ch3 measured value R o Jo 0x06 DCH4 Ch4 measured value R 0 07 DCHS5 Ch5 measured value R 0 08 DCH6 Ch6 measured value R o 0x09 DCH7 Ch7 measured value R o Jo 0x0A i System reservation 0x0D OxOE CREFO Current Ch0 reference value R o o Result of drift correction is reflected 0 0 CTHRO Current Ch0 variation judged as o Result of drift correction is reflected On 0x10 CHYSO Current Ch0 hysteresis value R o Result of drift correction is reflected 0x11 CREFI Current Chl reference value R o o Result of drift correction is reflected Command Desig Description Access limit Remark code nation 0x12 1 Current Chl variation judged as R o o Result of drift correction is reflected On 0x13 CHYSI Current Chl hysteresis value R o o Result of drift correction is reflected 0x14 CREF2 Current Ch2 reference value R o o Result of drift correction is reflected 0x15 CTHR2 Current Ch2 variation judged as R o o Result of drift correction is reflected On 0x16 CHYS2 Current Ch2 hysteresis value R o o Result of drift correction is reflected 0x17 CREF3 Current Ch3 reference value R o o Result of drift correction is reflect
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