520 Hardware User Manual
Contents
1. contactl from CPU contact2 Figure 21 Relay DO The relay output is a dry contact so there is no polarity of the contact 1 and 2 The relay used is a Takamisawa JY 5H K type and is capable of load up to e 5A at 30VDC e A at 125VAC e A at 250VAC 23 LED 2 LEDs green and red are equipped to indicate working status and can be controlled by software 24 Speaker amp Ear phone A buzzer is equipped as the audio indicator Its tone is software controllable whereas the volume is to be tuned via a variable resistor Depending on application needs an ear phone can also be attached The audio jack has been intentionally designed to disable the buzzer while the ear phone is connected Usual ear phone used in Walk Man can be used with 520 25 Wall mount shelf An optional metal case can be used if mounting on the wall is required 26 Table stand An optional table stand can be used if mounting on the table is required Syntech Information Co Ltd 31 Table of Contents2. During system initialization this register is set to 186 1 sec 1 day 1000000 24 hours 60 min 60 sec 11 57 ppm 12 ppm Write protected The time and trimming register are write protected and they won t be changed accidentally Cold start detection There is a cold start bit in the chip This bit is set if power loss encountered or on first power on The software can then recognize this bit and initialize the calendar chip List of Figures 14 Syntech Information Co Ltd Cipher 520 Hardware Reference Manual 15 Memory and Calendar Backup Battery A 3 6V rechargeable NiMH battery is used to backup the SRAM and keeps the calendar chip running even when system power is off Its capacity is 60 mAh and is trickle charged with a typical 1 2 mA current After fully charged it is able to sustain for more than 15 months as follows SRAM LL type SONY CXK581000 current consumed is 0 7uA typical and 4uA max 0 to 40 C V3022 0 9uA typical 1 5uA max Time typical 60 mAh 0 7 0 9 37500 hrs 1562 days gt 52 months Time worst 60 mAh 4 0 1 5 10909 hrs 454 days gt 15 months A switch is equipped to disconnect and preserve battery power when the 520 is not to be used for a while e g during shipping This switch must be normally turned on else the SRAM contents and system time will get lost once the 520 was turned off However the 520 can still work properly regardless of this switch sett
3. 30 Figure 21 Relay DO iii aii 31 List of Figures Syntech Information Co Ltd Cipher 520 Hardware Reference Manual 1 Preface This manual provides in depth hardware informations of the Cipher 520 programmable terminal and serves as a reference for hardware and maintenance engineers Assumption has been made that readers of this manual have basic knowledge of electric and or electronic theory Numberings of all components including connectors passive and active components conform to the PCB V0 03 However Syntech does not guarantee this conformity The numberings and locations of components might be re arranged For confirmation please refer to the PCB and its schematics After all this manual intends to describe the operation theory of the circuitry utilized Syntech Information Co Ltd Table of Contents Cipher 520 Hardware Reference Manual 2 General Features The Cipher 520 is equipped with the followings TLCS 900 16 bit CPU running at 14 7456 MHz Program 512 KB flash memory Data memory 128 KB battery back up SRAM Memory card optional 512 KB to 2 MB SRAM on a 512 KB basis Fine tunable calendar chip Memory amp calendar chip backup 3 6V NiCd battery optional 1 2V X 7 1200 or 1800 mAh rechargeable NiMH battery X 1 or 2 for operation backup Battery external DC voltage monitor circuit on board Self shutdown circuit on board to prevent battery over discharge optional slot bar code reader or magnetic card
4. 50 C Temperature storage 20 to 70 C EMC regulation FCC class A and CE approved Physical Dimensions mm including battery holder Weight maximum including all batteries Material ABS Color dark Gray List of Figures 4 Syntech Information Co Ltd Cipher 520 Hardware Reference Manual 5 Nomenclature 5 1 Front view Figure 1 Front View 1 Red and Green LED for status indication 2 LCD display 240 X 64 or 128 X 64 3 optional slot type reader barcode or magnetic card 4 Keyboard 5 Volume 6 external ear phone connector 7 external PC AT keyboard connector 8 Reader port 1 9 Reader port 2 Syntech Information Co Ltd 5 Table of Contents 5 2 Rear View Cipher 520 Hardware Reference Manual List of Figures 1 2 3 4 5 6 7 8 9 Figure2 Rear View Optional Operational Battery COM connector COM2 connector COM3 connector Digital input output connector external power DC jack Power switch through hole for slot reader cable table stand mounting hole 6 Syntech Information Co Ltd Cipher 520 Hardware Reference Manual JP6 JPS Ul COM1 board COM2 board U8 H po H U10 i BT1 JP3 JP4 JP12 JP8 Figure3 Main PCB front 1 JP9 digital I O 20 JP3 battery 1 2 P3 COMI 21 JP4 battery 2 3 P2 COM2 22 JP8 keyboard connector 4 Pl COM3 23 JP12 reader 1 connector 5 J1 12V DC 24 JP11 reader 2 connector 6 S3
5. asserted again To restart the machine the power switch must be turned off and then on again Syntech Information Co Ltd 11 Table of Contents Cipher 520 Hardware Reference Manual 9 Reset The system reset signal is generated by a voltage detector chip Maxim MAX703 or compatible chips It outputs an active low reset signal when the system power drops below a pre determined voltage level Vdet The reset signal then changes to high when the power is higher than another pre determined voltage level Vdet The Vdet is about 200 mV higher than Vdet This is known as hysteresis and it prevents noise from false triggering the reset circuitry The TLCS 900 is guaranteed to work within 5V 10 and the Vdet is set to 4 6V This reset signal does not only ensure the proper operation of the CPU but also is used to reset the UART chip NS82C50 and control SRAM access connecting to SRAM CE2 during power up and power down The later is very important as the SRAM contents might be changed by unwanted spikes during supply voltage changes Besides this basic function this chip also provides power supply switching between 5V and back up battery for SRAM calendar and so on That is when power switch is off the SRAM contents can be preserved and the calendar chip running is not interrupted List of Figures 12 Syntech Information Co Ltd Cipher 520 Hardware Reference Manual 10 CPU The CPU used in 520 is a Toshiba 16 bit CMOS CP
6. power switch 25 BT1 3 6V NiHM battery 7 JP7 LCD connector 26 P4 reader 1 8 J2 DIO board connector 27 P5 reader 2 9 DIO board 28 JP10 external AT keyboard 10 JP6 COM1 board connector 29 J3 ear phone 11 COM1 board 30 R40 volume 12 JP5 COM2 board connector 31 LS1 Buzzer 13 COM2 board 32 S2 manual reset 14 R27 LCD view angle tuning 33 S1 NiHM battery on off 15 JP1 memory card connector 34 Ul CPU 16 D1 red LED 35 U8 UART fot COM3 17 D2 green LED 36 U10 calendar chip 18 Fl 1 amp fuse for main board 19 F2 1 amp fuse for external devices Syntech Information Co Ltd 7 Table of Contents U3 U2 U6 List of Figures Cipher 520 Hardware Reference Manual Figure 4 Main PCB back 1 U6 Reset 2 U3 1Mbit SRAM 3 U2 4 Mbit flash memory 8 Syntech Information Co Ltd Cipher 520 Hardware Reference Manual 7 Power Circuit 7 1 Power Source The 520 can be powered from 2 sources the external 12VDC or operation backup battery If line power was down the 1200 or 1800 mAh NiMH battery pack then took the place to provide the system power The switching from external DC power to the battery is accomplished by a simple pair of diodes and is not even noticed by the operator J1 DC Jack Figure5 Main Power Connector 7 2 Switching Regulator A high efficiency buck type switching regulator Maxim MAX1626 is used to generate the required system power 5V This regulator is c
7. reader 2 reader ports each for barcode scanners Wand or Laser emulation or single dual track magnetic card readers 128X64 or 240X64 graphic type LCD display with LED back light rubber keyboard up to 8 X 8 up to 16 LEDs on the keyboard board 8 digital input output each can be configured to input or output external keyboard port for external PC AT keyboard attachment RS232 port X 1 Communication port X 2 each can be configured as CMOS RS232 RS232 RS485 half duplex RS485 full duplex or 20 mA current loop List of Figures Syntech Information Co Ltd Cipher 520 Hardware Reference Manual 3 What s New Compared to Cipher 510 many features have been enhanced and are listed below Indicator Good Read amp Ready also up to 16 LEDs on the keyboard board 128KB flash 512KB flash up to 512 KB up to 2MB 128KB boards input or output switching regulator resettable 1 Amp fuse X 2 speaker or ear phone programmable tunable via variable resistor Syntech Information Co Ltd 3 Table of Contents Cipher 520 Hardware Reference Manual 4 Characteristics Basic characteristics of the Cipher 520 are listed below 4 1 4 2 4 3 Electrical e Main Power Supply Voltage 12V 5 DC Power consumption maximum with LCD backlight off and no external devices attached Environmental Humidity operating non condensed 20 to 90 Humidity storage non condensed 10 to 95 Temperature operating 0 to
8. share the same pin However the software is able to tell which type of the readers are attached 1 9 OOOO DO ODO JP 11 amp 12 male 2 54 mm SIP DB 9 Male 00000 0000 Front Veiw P4 amp P5 D type 9 pin male Figure 7 Reader Connector JP11 amp 12 P4 amp PS 1 Data 7 7 Vee 5V The JP11 and JP12 are mainly for attaching slot type readers And since they share the same signal lines as P4 and P5 They should not be used at the same time For example if JP11 is attached to the slot type MSR then P4 should not be used else fault would occur Syntech Information Co Ltd 17 Table of Contents Cipher 520 Hardware Reference Manual 18 External PC AT Keyboard Besides the built in rubber keyboard an external PC AT keyboard can be attached for handy data entry The connector and pin assignment conforms to PC AT standard keyboard Mini DIN 6M OO O 009 Front View JP10 mini DIN 6 pin female Figure 8 External Keyboard Connector N C data 5V Ground N C clock DURAN Cipher 520 Hardware Reference Manual 19 Keyboard amp indicators An 8 by 8 scanning circuitry has been reserved for accessing the built in rubber keyboard and LED up to 16 indicators The standard keyboard provides the following keys e numbers 0 9 e function keys F1 F8 each has an corresponding LED e ESC escape e clear e BS back space e Space e Alpha toggle between numbers and alphas
9. with LED e 4 direction keys up down right and left e Enter 1 2 3 4 5 6 7 8 9 1 DOO EO O20 OO O DO OO as JP8 10 X 2 2 54 mm male connector Figure 9 Keypad Connector D8 Vcc 5V D9 Ground D10 out select Dil in select D12 0 LED enable Syntech Information Co Ltd 11 12 13 14 15 16 17 18 19 20 19 D13 Ground D14 Ground D15 Vec 5V Keyboard IDO Keyboard ID1 Keyboard ID2 Keyboard D3 Table of Contents Cipher 520 Hardware Reference Manual 20 Memory card The data memory can be extended by adding an optional memory card Which is able to provide 512 KByte to 2 Mbyte SRAM on an 512 KB basis since 4 Mbit size SRAMs are used Contents of these SRAMs are backed by an on board 3 6V NiMH battery same type of battery used on main board 2 slide switches are used for e Battery on off if the memory card is not to be used for a while This switch can be set to OFF to preserve battery power Of course under normal use it MUST be set ON e Memory access on off when set to OFF access to these SRAMs are denied This is usually used when a memory card is to be switched from one terminal to another However care should be taken that the battery ON OFF switch should be at the ON position else SRAM contents would be lost Also under normal use it should be set ON Since the flash writer which we have mentioned in prior section uses the
10. Cipher 520 Hardware Reference Manual v1 01 Mar 25 1999 O 1997 Syntech Information Corporation CipherLab is a registered trademark of the Syntech Information Corporation Cipher 520 Hardware Reference Manual TABLE OF CONTENTS te ta 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 Preta ion an PAR N A A N 1 General ESAtUTES cueca e E EO EE EEA aeae 2 ATA ETEESI T SA aE aE OERE ee ee esa re o T OEE E EETA 3 Characters iii ted ras 4 data Bleed 4 42 Environmental andanada abad 4 43e A A O 4 Nomenclatura a adan 5 Jel ON 5 A A A O O 6 PCB 7 PoWer AT i Ti tata tia eI 9 Dee ROWE SOU 9 T23 SWitehing RE lara 9 Tas SUSE ares sens ohreics a a boca sas tad Soe saa Pages tae UE a Ie aaa 9 Us A A O gs gone SE 10 Reset 12 CPU 13 Program Memory Flash li aes 13 Flashear aa talca ais sad 13 Data Memory SRAM sssivcivis ascii aria dba n a it 13 Calendar col dd 14 Memory and Calendar Backup Battery ooococonococnnncccnnncncnoncnononcnononaconancncnanaccnnnos 15 LCD 16 A O O OL 17 External PC AT Keyboard uvinnicioniail dardo na ousted couadeaeds ei eiia 18 Keyboard SE TOCA A heh ee a eee AAA 19 Mi Card 340 eG Re GG IIa RE A Cie 20 COM POT dotes 21 Disttaldput Op e tel ee 0 25 Docks Digital Input E AS E A aaa 26 De De Digtal OVPU o odiosa 28 LED 31 Speaker Go Bar PIO a E 31 Walleimount Shelf citas a its 31 Fable Stands lara bt it 31 Syntech Information Co Ltd Table of Cont
11. U TMP95C061 and features the follows Clock rate up to 20 MHz 14 7456 MHz for 520 mixed 8 16 bit data bus widths direct addressing up to 16 Mbytes 2 UART ports 4 8 bit timers 2 16 bit timers 10s of I O ports depends on application 4 10 bit ADC channels 11 Program Memory Flash 4 MBit flash memory AMD 29F400BT or the likes is used to store the program code font and so on and features the follows e guaranteed 100 000 erase program cycles e single 5V for read erase and programming e 11 blocks each can be individually erased and re programmed e 8 16 bits data bus To facilitate program execution performance this flash memory is accessed via a 16 bit data bus A 150 ns or faster access time type flash is used to accommodate the CPU rate 12 Flash writer Normally contents of the flash e g application program can be updated by using the 520 itself of course by proper programming However it is possible that the flash might get corrupted by improper usage or accident Since the 520 then cannot even start up properly There must be some ways to re program the flash memory A flash writer card has been developed by Syntech to prevent nasty soldering This card is able to program the flash memory when it is already on the 520 board For detail usage and information of this card please refer to its operation manual 13 Data Memory SRAM A 1 Mbit low power SRAM is equipped for program variables data and so on It
12. a from a pair of signal lines Non inverting data 6 Nocomnection Inverting data 8 Noconnection 4 Noconnection 9 H5V O 5 Noconnection y O 21 1 3 Full duplex RS485 This is a differential serial communication interface where all terminals send and receive data each from a pair of signal lines Syntech Information Co Ltd 21 Table of Contents Cipher 520 Hardware Reference Manual 1_ Non inverting transmit data 6 ground 3 Inverting transmit data 8 Nocomnection 4 Noconnection 9 HSV 5 Non invertingreceivedata RS485 transceivers both half and full duplex board are protected by a pair of surge protectors Also when the terminal is at either end of the RS485 bus a terminator should be used to cancel signal echoing This can be easily done by putting the slide switch to ON position move the switch to your right hand which will connect 3 resistors onto the bus as follows Figure 11 RS485 terminator 22 Speaker Cipher 520 Hardware Reference Manual 21 1 4 20 mA current loop This is usually used when electrical isolation between communication sides are required Pin assignments of the 20 mA current loop are as follows 1 Transmitpower 6 Receivecathode 3 Transmit emitter 8 Ground 4 Receivepower 9 SV 5 ReceiveAmode J Jo ooo Both transmit and receive part can work in either active providing power or passive getting power from
13. apable of delivering up to 2 Amp current And as a low on resistance P channel MOSFET has been used the conversion efficiency is very high even at light loads 80 or more under 10 mA load Low ESR equivalent series resistance type tantalum capacitors are used both at input and output sides to reduce ripples Also it is capable of 100 duty cycle operation That is when the input voltage is low usually when the operational back up battery is used and is almost drained the MOSFET is turned on all the time Thus long working time utilizing the battery can be achieved 7 3 Fuse Two resettable fuses are used to protect the circuitry These fuses are actually thermistor like components whose resistance increase when temperature rises results from large current flows through and thus current flows through are limited Since it is not actually broken as traditional fuses replacement is not needed e Fl main board add on boards memory card DIO card COM cards and so on e 2 external devices such as readers PC AT keyboards and so on Syntech Information Co Ltd 9 Table of Contents Cipher 520 Hardware Reference Manual 8 Operation Battery 8 1 1 Battery To facilitate procurement off the shelf battery pack is used as follows e NiMH 1 2V X 7 free of memory effect e 1200 or 18000 mAh After fully charged if LCD backlight is on and no external devices been attached one battery pack can last for 2 5 hours Of course if l
14. ents Cipher 520 Hardware Reference Manual LIST OF FIGURES Figure 1 Front View ci iaa 5 Fig re 2 Rear View nosene sauna sno douse aco as R 6 Figure 3 Main PCB froin ida 7 Figure 4 Main PUDOR RIO 8 Figure 5 Main Power Connector 0 cccccceccceesceesceceseceseceeeeesaceceaeceeeeeeeenseeesaeenas 9 Figure 6 LCD Connector 530 alinne Maeda isos asae 16 Figure 7 Reader Connector eins a 17 Figure 8 External Keyboard Connector oooooonnccnnncninccnonccconoconoconcconnnoonnoconccnnccnancnos 18 Figure 9 Keypad Connector icon talas 19 Figure 10 COM port Connector iii ti e ae Gas ete 21 Figure 11 RS485 terminator id Dude is 22 Figure 12 20 mA current loop transmit connection ooonooccnnnnccnnncccnnncccinnnccinnnos 23 Figure 13 20 mA current loop receive connection ooonoonnnnnnnncnnccnnccccocaconccanccinncnns 24 Figure 14 DIO board connector ienc tesdcouiswtnd caeincaineacs alia eae 23 Figure 15 DIO connector titi ds 25 Figure 16 CMOS level DL dias 26 Figure 17 Photo isolated DI cccccccccssscecssscecssscesssscessscceessscesnsseesneessnenessneees 27 Figure 18 Digital Input Example oooooonnccnnncnnnncnnnconoccconccoonccononono nono conno cono canccnnncnos 28 Figure 19 Digital Input Example ooooonncnnnnccnnncnnccnnccnconcconnccono conc conn conocio cono cnnncnnncnon 29 Figure 20 Digital Input Example ooooooconnnnccnnoncccnonccinoncnononccononcconnnononnnccnnnnccnnnnoo
15. external device mode R22100 1 4W transmit power 5V O 5V transmit collector M a gt d A TLP627 transmit emitter receive anode IN 1 5K ransmit data Loh PAISU receive cathode SNE 520 in trasmit active mode 520 in receive passive mode Figure 12 20 mA current loop transmit connection Syntech Information Co Ltd 23 Table of Contents Cipher 520 Hardware Reference Manual R22 100 1 4W receive power 5V O l receive anode receive data r PA 4 receive cathode transmit collector ee INO transmit emitter SE 520 inreceive active mode 520 in transmit passive mode Figure 13 20 mA current loop receive connection 24 Speaker Cipher 520 Hardware Reference Manual 22 Digital Input Output 8 digital input output pins has been reserved and each can be individually set to input or output An optional DIO board can be used to accommodate kinds of input output needs J2 dual in line 15 X 2 2 54 mm male connector Figure 14 DIO board connector Shorts to JP9 pin 3 to 22 DB 25 Female OOOOOODOOOOOO OOOCEOOOOOOG O Front View JP9 D type 25 pin Female connector Figure 15 DIO connector No Ground 24 SV DIO board dependent Syntech Information Co Ltd 25 Table of Contents Cipher 520 Hardware Reference Manual 22 1 Digital Input 2 kinds of digital inputs are available e CMOS type This is the 5V CMOS type digital signal For 41 40 board pin as
16. ing since the SRAM and calendar chip is at that time supplied by the system 5V Syntech Information Co Ltd 15 Table of Contents Cipher 520 Hardware Reference Manual 16 LCD Two types of LCD displays can be used in 520 as follows e 240 X 64 dots e 128 X 64 dots Both are STN type graphic display equipped with LED back light The typical back light current for 240X64 type is 320 mA 000 22 Figure 6 JP7 OO LCD Connector This is a 22 pin SIP single in line 2 54 mm pitch connector Ground Vcc 5V Vo view angle control A1 address bus read write control chip enable D8 data bus D9 data bus D10 data bus 10 D11 data bus 11 D12 data bus CHAIAARWNS List of Figures 12 13 14 15 16 17 18 19 20 21 22 16 D13 data bus D14 data bus D15 data bus chip select 1 chip select 2 reset Vee 10V LED backlight anode shorts to 5V LED backlight cathode LED backlight anode shorts to 5V LED backlight cathode Syntech Information Co Ltd Cipher 520 Hardware Reference Manual 17 Reader There are total 2 reader ports provided each can be either a Barcode slot reader Barcode Scanner Wand Laser emulation or up to dual track magnetic card reader They are equivalent in both hardware and software Their connectors and pin assignments are listed below Beware that in order to decode barcode and magnetic card at the same time some signals
17. ly voltage of the external device V_ negative supply voltage of the external device Vf LED forward voltage Ry current setting resistor Ron switch contact resistance If V4 V 5V and maximum Ron is 100 then 5 1 3 R1 10 2 1 mA Ry lt 3 7KQ 22 2 Digital Output 3 kinds of digital outputs are available CMOS level DO 28 Speaker Cipher 520 Hardware Reference Manual For 41 40 board pin assignments of the JP9 are as follows DO 3 DO 4 10K U A from CPU I O pin 1 2 Digital Output 74HC04 Figure 19 CMOS level DO Syntech Information Co Ltd 29 Table of Contents Cipher 520 Hardware Reference Manual Open collector DO For 41 40 board pin assignments of the JP9 are as follows DO 3 15 bon gt gt gt ee COMMON 10K from CPU I O pin 1 2 Digital Output ULN2003 74HC04 Figure 20 Open collector DO Care should be taken that 1f inductive type load is to be connected the COMMON point can be used for inductor inherent reverse EMF suppression For example Common external power This would connect the ULN2003 internal suppressing diode across this inductive load 30 Speaker Cipher 520 Hardware Reference Manual Relay Output For 41 40 board pin assignments of the JP9 are as follows DO 1 contact 1 DO 3 contact 1 DO 1 contact 2 DO 3 contact 2 DO 2 contact 1 DO 4 contact 1 DO 2 contact 2 DO 4 contact 2
18. memory card connector also A JP2 connector is intentionally left on the board such that the flash writer can still be used when the memory card is equipped Also like the battery on the main board the 3 6V NiHM battery is charged by the system 5V After fully charged the data retention time is estimated below SRAM LL type SONY CXK581000 current consumed is 0 7uA typical and 4uA max 0 to 40 C Time 1 SRAM typical 60 mAh 0 7 85714 hrs 3571 days gt 119 months Time 1 SRAM worst 60 mAh 4 0 15000 hrs 625 days gt 20 months More SRAMs are equipped less data retention time 20 Speaker Cipher 520 Hardware Reference Manual 21 COM port There are totally 3 serial communication ports namely COM1 COM2 and COM3 They all features DB 9 female connector as depicted below DB 9 Male 00000 0000 Front Veiw Figure 10 COM port Connector For flexibility for COM1 amp 2 4 kinds of COM boards can be attached to accommodate application needs as follows e RS232 e Half duplex RS485 e Full duplex RS485 e 20 mA current loop Whereas the COM3 has been fixed to RS232 21 1 1 RS232 This is an EIA RS232C compatible interface and provides 4 signals as follows 1 Grun 6 Nocomecti on 3 Receivedata 8 RTS 4 Noconenction 9 45V O 5 ground d E 21 1 2 Half duplex RS485 This is a differential serial communication interface where all terminals send and receive dat
19. nent damage such as polarity reversal A monitoring and shutdown circuitry is used to prevent this from happening The battery voltage is feed to the CPU on chip ADC via a resistor divider and then is checked by the program If the battery was drained the system will shutdown the system power During the discharging cycle from fully charged to drained the battery voltage drops rapidly at the beginning and then stays around 1 2V during most of the cycle 70 Finally when it is about to be drained the voltage starts to drop again Unfortunately the battery voltage alone is not sufficient to decide the remaining capacity of the battery The recommended voltage level is 1 1V per cell for battery low and 1 0V for drained That is if the whole battery pack drops to below 6 0V it is considered to be drained and the system power will be shutdown List of Figures 10 Syntech Information Co Ltd Cipher 520 Hardware Reference Manual The shutdown is accomplished by a Flip Flop and its glue circuits Its output is reset to low power enabled during power on A CPU output pin can then set it to high to shutdown the switching regulator by sending a negative going pulse An R C network prevents power on spikes to false trigger the circuit by disabling it for the starting 50ms After shutdown this Flip Flop is still powered to keep this shutdown signal which however consumes very little current The shutdown signal stays even if the main power is
20. onger working time is required both battery packs can be equipped to double it 8 1 2 Charging The charging current is typically 36 mA 0 02C In this way the battery pack can be fully charged from fully drained in about 60 hours This is also the safe charging current when the battery pack is fully charged Else heat will be generated and shall damage or shorten useful life of the battery pack Note that this is not a software controllable charging As long as the main power 12V is available even if the power switch is off this charging is taken in place 8 1 3 Maintenance Normally the NiMH battery is guaranteed to work for 300 charge discharge cycles while preserves at least 60 of its original capacity However it features a self discharging characteristic even when it is disconnected After a long term storage even when it is new several charge discharge cycles should be exercised to restore its specified capacity On the shelf battery chargers can be used for this purpose 8 1 4 Protection amp Shutdown The typical voltage for a NiMH battery cell is 1 2V and can be charged up to 1 4V or even 1 5V when fully charged When the battery is fully charged only a small amount of current can be asserted into the battery As long as the charge current is within the specified trickle charge current limit 0 04 C the battery will not be damaged However deep discharging the battery degrades its useful life or even cause perma
21. s contents are backed up by the on board 3 6V NiMH battery A 150 ns or faster access time type SRAM is used to accommodate the CPU rate Syntech Information Co Ltd 13 Table of Contents Cipher 520 Hardware Reference Manual 14 Calendar chip A battery backup calendar chip is used to retain the system time even when power is off The chip utilized is a V3022 from EM micro electronic Marin SA It features the following outstanding features Very low power consumption When powered from the battery 3 6V the current is typically 0 9uA Wide operation voltage range This chip works down to 2V On chip high precision oscillator This is a must for accurate time keeping The oscillator is built in inside the chip and is factory trimmed Timer Adjustment It can also be fine tuned to compensate for a fast or slow clock This is an outstanding feature for those applications which need absolute accurate system time such as a time clock application The tuning of the calendar chip is done by modifying the value of the trimming register of the calendar chip Trimming Register The speed of the calendar chip can be tuned in units of ppm via a digital trimming register The trimming range is from 0 to 255 ppm The bigger the value of the trimming register the slower the calendar chip runs For instance if the calendar chip is 1 second slow in one day then the value of the trimming register should decrease 12 to correctly adjust the calendar chip
22. signments of JP9 are as follows DI 1 DI 3 DI 4 5V 10K 100 DI 1 2 to CPU I O pin 74HC04 Figure 16 CMOS level DI 9 e Photo coupled This is used when electrical isolation is required 6 8 DI cathode 9 26 Speaker Cipher 520 Hardware Reference Manual 5V 10K anode to CPU I O pin a gt TLP521 cathode o eo Figure 17 Photo isolated DI Characteristics of the TLP 521 are listed below 1 LED e Maximum Forward current 70 mA e Pulse forward current 1 A e Maximum reverse voltage 5V e Forward voltage at 10 mA 1 15V typical 1 3V maximum e Reverse current 10u A maximum 2 Output Transistor e Collector Emitter breakdown Voltage 35 V e Emitter Collector breakdown Voltage 7 V e Maximum Power dissipation 150 mW e Maximum collector current 50 mA e Collector dark current at 25 C 100 nA maximum e Collector dark current at 85 C SOUA maximum e Current transfer ratio 100 minimum 600 maximum e Isolation resistance 10 o typical e Isolation Voltage 2500 Vrms typical The transistor collector is pulled up by Ri a 10K resistor and then feed to CPU input pin which features a low threshold of 0 8V and high threshold of 2 2V That is the collector voltage must be no more than 0 8V to be treated as low and no lower than 2 2V to be treated as high 22 1 1 Input High Ideally when there is no current flowing through the input LED the outp
23. ut transistor is off and the collector is pulled up to 5V However leakage current does exist Assume a small leakage current flows through the LED then collector voltage Vc 5V Ic Ri gt 2 2 V where Ic is the collector current and collector dark current LED leakage current current transfer ratio Syntech Information Co Ltd 27 Table of Contents Cipher 520 Hardware Reference Manual The lowest collector voltage worst case 5 0 SOuA IL 600 10 K 5 V 0 5 V 60000 IL gt 2 2 V and IL lt 38 pA That is the leakage current into the LED should not be larger than 38uA however this is much higher than the LED leakage current 10 uA and false trigger is not likely to happen 22 1 2 Input Low To input a low the external device must supply a large enough current to flow through the LED to turn on the transistor and pull collector no higher than 0 8V This LED current can be calculated similar to the case for input high 5V 0 5V 100 IL 10K lt 0 8 V then IL gt 0 37 mA That is to pull the digital points low there must be at least 0 37 mA current flowing through the LED For example to connect an external dry contact to the digital inputs External Device Cipher 510 5V NES og Collector RI SWI1 TLP521 Cathode Emitter Figure 18 Digital Input Example LED current IL V4 V V R Ron 0 37 mA 1 mA safe margin Where V4 positive supp
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