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CW25-TIM

1. Figure 8 Grounding the CW25 TIM with a Ground Plane 9 4 Battery Backup The CW25 TIM has an on board real time clock RTC This is used to store date and time information while the CW25 TIM is powered down Having a valid date and time speeds the Time To First Fix TTFF allowing the CW25 TIM to meet its quoted TTFF specification The CW25 TIM relies on an external power source to power the RTC VBATT when the DIG_3V3 is not present If the user application does not require the warm or hot fix performance or the required information is provided by network assistance there is no need to provide the VBATT signal The VBATT signal must be greater than 2 6V and less than DIG_3V3 0 6V Typically a 3V lithium primary cell or a high capacity supercap will be used The CW25 TIM has an internal blocking diode so if a supercap or rechargeable battery is used an external charging circuit will be required 100R ness 1K VBATT 1K VBATT CR2032 Cell 0 47F Supercap DIG_GND DIG_GND Figure 9 Typical VBATT Supplies NS18 DS CW25 TIM Rev 07 Date 03 26 09 j NAVSYNC u Copyright 2009 NavSync Ltd All Rights Reserved Specifications subject to change without notice 9 APPLICATION HINTS continued 9 5 Over Voltage amp Reverse Polarity Protection The CW25 NAV co
2. 13 5 SPECIAL FEATURES mm mm 15 5 1 User CommandS 15 5 2 Self Survey 15 5 3 CW25 TIM Embedded Identification 15 6 TAPE AND REEL SPECIFICATIONS 16 7 SOLDER PROFILE mm men 16 8 DEMO KIT INFORMATION mm 16 9 APPLICATION HINTS m mm 17 9 1 Power Supply 17 9 2 RF Connection 4 44 44 4444 444 4000 17 9 3 Grounding 18 9 4 Battery Backup 18 9 5 Over Voltage amp Reverse Polarity Protection 19 9 6 a ee 19 9 7 Reset Generation 19 9 8 Boot Options m ee 19 Copyright 2009 NavSync Ltd All Rights Reserved Specifications subject to change without notice Navsync 3 Figure and Table Contents List of Figures Figure 1 CW25 TIM Block Diagram 7 Figure 2 CW25 TIM Form and Size
3. 8 Figure 3 CW25 TIM Dimensions 9 Figure 4 Solder Pad Size and Placement 10 Figure 5 RF Tracking Example 17 Figure 6 Grounding the CW25 TIM with a ground plane 18 Figure 7 Typical VBATT Supplies 19 List of Tables Table 1 Revision History 2 Table 2 Additional Documentation List 3 Table 3 CW25 TIM Specification 6 Table 4 Absolute Maximum Ratings 7 Table 5 Absolute Maximum Ratings 7 Table 6 CW25 TIM Signal List 8 Table 7 RF Track amp Gap Widths 17 Revision History of Version 1 0 Revision Date Released By Note 01 08 08 05 Rob Rae New version reflecting interfaces performance 02 07 03 07 Kati
4. NS18 DS Bulletin 07 26 March 2009 Revision Date 2 NAVSYNC i Copyright 2009 NavSync Ltd All Rights Reserved Specifications subject to change without notice TABLE OF CONTENTS 1 INTRODUCTION 9 22 222 2n2 nnn nner nnn men 4 2 SPECIFICATION mau men 6 2 1 Performance 6 2 2 Recommended Ratings nn 7 2 3 Absolute Maximum RatiNngS 7 2 4 Block Diagram 7 3 PHYSICAL CHARACTERISTICS mm 8 3 1 Physical Interface Details 8 3 2 CW25 TIM Dimensions 44 4242 42 9 33 Solder Pad Size and Placement 9 4 SIGNAL DESCRIPTION mm 11 4 1 Power Signals 11 4 2 RF Signals 12 4 3 Emulation Test Signals 12 4 4 Control Signals 13 4 5 WO SignalS
5. BGOTSEL 11 1 3 1 Physical Interface Details The interface to the CW25 TIM is via 1mm castellations on a 2mm pitch There are 42 connections in all There is also an RF connector for connecting to the GPS antenna The details of the interface connections are given Figure 2 CW25 TIM Form and Size below Pin Function Pin Function Pin Function 1 TX 0 15 NTRST 29 N2WDA 2 RxX 0 16 NPOR 30 USBP 3 TX 2 17 RFV_OUT 31 USBN 4 RX 2 EV2_IN 18 RF_GND 32 FREQ_OUT 5 RM 19 RF_8V3 33 1V8_OUT 6 RX 20 TCK 34 DIG_1V8 7 EXT_CLK 21 JTAGSEL RTCK 35 DIG_GND 8 LED_RED 22 TMS 36 DIG_3V3 9 LED_GRN 23 RF_GND 37 EVENT_IN 10 NRESET 24 RF_IN 38 1PPS 11 BOOTSEL 25 RF_GND 39 GPIO 0 YPWM_OUT 12 TRIM 26 ANT_SUPPLY 40 GPIO 1 TIME_SYNC 13 TDO 27 VBATT 41 GPIO 2 NEXT_INT 14 TDI 28 N2WCK 42 GPIO 3 FREQ_IN Note 3 Frequency Output is available on pin 32 FREQ_OUT with custom software only Table 6 CW25 TIM Signal List g f a Copyright 2009 NavSync Ltd All Rights Reserved Specifications subject to change without notice 3 PHYSICAL CHARACTERISTICS continued 3 2 CW25 TIM Dimensions The figure below provides the dimensions of the positioning of the CW25 TIM castellations Dimensions are in mm inches 1000 26 42 1040 2 iets _ 13 19 520 2 Ered livar 991 JOUOGDDD QUO 2 ET T3 24 38 C960 12 19 480 O00000
6. 000G 2 78 7 UO PIN 1 1 39 4 2 03 89 3 118 11 Figure 3 CW25 TIM Dimensions 3 3 Solder Pad Size and Placement It is recommended that the footprint of the solder pad under each castellation be 2mm x 1mm centered on the nominal centre point of the radius of the castellation The castellations are gold plated and so are lead free Note that if the RF_IN connector is being used there should not be a pad or solder resist under the RF_IN castellation If the RF_IN castellation is to be used the pad should be shortened by 0 5mm underneath the CW25 TIM and standard RF design practices must be observed The diagram below shows the placement of the pads under the castellations TEKEE pee Figure 4 Solder Pad Size and Placement NAVSYNC Copyright 2009 NavSync Ltd All Rights Reserved Specifications subject to change without notice a 9 4 SIGNAL DESCRIPTION The signals on the CW25 TIM are described in the table below 4 1 Power Signals RF_3V3 Type Power Direction Input Pin 19 The RF Supply Input This 3 3V 10 input supplies the 2 9V LDO regulator in the RF section of the CW25 TIM It is important that this supply is well filtered with no more that 50mV peak to peak noise with respect to RF_GND RF_GND Type Power Direction Input Output Pins 18 23 25 The RF Input Ground This is the return path for the RF_3V3 supply and the ground for the antenna feed The RF_GND must be tied to the DIG_GND exte
7. Standard software builds use this signal to indicate GPS status where a Long red flash indicates an invalid fix and Short red flashes for satellites tracked but not used in solution In special software builds this signal can be used as GPIO This signal has a 3 3V CMOS drive A series limiting resistor is required to limit output current to 5mA The signal return path is DIG_GND LED_GRN Type I O Direction Output Pin 9 This is a Dual Function Signal Normally this signal is used to drive a green LED Stan dard software builds use this signal to indicate GPS status where a Long green flash indicates an valid 2D 3D fix and Short green flashes for number of satellites used in solution In special software builds this signal can be used as GPIO This signal has a 3 3V CMOS drive A series limiting resistor is required to limit output current to 5mA The signal return path is DIG_GND GPIO 0 PWM Type I O Direction Input Output Pin 39 Normally the GPIO 0 PWM output provides a Frequency Output that defaults to 10 MHz and is user configurable from 10 Hz to 30 MHz signal The output is enabled on power up and is steered by the GPS solution Custom software versions can also configure this pin for general I O PWM or EPOCH output The signal return path is DIG_GND GPIO 1 TIME_SYNC Type I ODirection Input Output Pin 40 The GPIO 1 TIME_SYNC pin provides a synchronization pulse generated by the on board RTC Custom softw
8. 7 0 Volts ANT_SUPPLY Antenna Supply Voltage 15 15 Volts DIG_SIG_IN Any Digital Input Signal 0 3 5 5 Volts RF_IN RF Input 15 15 Volts TSTORE Storage temperature 40 85 C IOUT Digital Signal Output Current 6 6 mA Table 5 Absolute Maximum Ratings 2 4 Block Diagram ANT_SUPPLY RF_3V3 DIG_1V8 1V8_OUT DIG_3V3 i RF Block Regulator Regulator amp Reset REIN ids ia Control Filter Emulation RF25IC BB25IC e Comms amp I O TRIM EXT_CLK _ Clock IF RTC amp PC Filter EEPROM ji NPOR VBATT Figure 1 CW25 TIM Block Diagram Copyright 2009 NavSync Ltd All Rights Reserved Specifications subject to change without notice 3 PHYSICAL CHARACTERISTICS The CW25 TIM is a multi chip module MCM built on an FR4 fiberglass PCB All digital and power connections to the CW25 TIM are via castellations on the 25 x 27 mm PCB The RF connection is via castellations or an RF connector The general arrangement of the CW25 TIM is shown in the diagram below Dimensions are in mm inches 1000 HIROSE H FL CONNECTOR PART NO H FL R SMT WK Mm G r oO an w u aevyvn N ANT_SVPPLY 5 RF_GND 1V 8_OUT DIG_1 8 DIG_GND DIG_3v3 EVENT_IN 1PPS GP10 0 PWM_OUT GPIOL1J TIME_SYNE GPIG 2 NEXT_INT GPIO 3 FREQ_IN 25 984 3 21 JTAGSELSRTCK 20 TCK 19 RF_3V3 18 RF_6GHD 17 RFY_GUT 16 NPOR 15 NTRST 14 TD 13 Too 12 TRIM Actual Size 4 2 165 3
9. Temp o o 245 255 C for 15 sec Typ 200 o Reflow Zone a 150 30 90 sec E Min Max z Soaking Zone 60 90 sec Typ 2 min Max 100 50 4 Ramp Slope not to exceed 3 C sec 0 r i r r 1 0 50 100 150 200 250 300 350 Time sec Figure 6 Solder Profile 8 DEMO KIT INFORMATION A CW25 Demo board is available for evaluation of the CW25 Receiver A full kit contains the Demo Board with mounted CW25 TIM or CW25 NAV RS232 serial Cable Power Supply Adaptor Region Specific with a 2 1 mm DC plug and a 3m TNC Magnetic Patch Antenna To reduce costs the CW25 Demo Board can be purchased separately with a pick and choose option for above accessories See CW25 Demo User Manual for more detailed information on this unit Please contact NavSync for pricing information on the full kit or individual items sync Copyright 2009 NavSync Ltd All Rights Reserved Specifications subject to change without notice 9 APPLICATION HINTS The following are a list of application hints that may help in implementing system based on the CW25 TIM 9 1 Power Supply The power supply requirements of the CW25 TIM can all be provided from a single 3 3V supply To simplify system integration on board regulators provide the correct voltage levels for the RF and oscillator 2 9V or 3 0V and low voltage digital core 1 8V In power sensitive applications it is recommended that the DIG_1V8 supply is provided from a high efficiency external 1 8V source e
10. This is a standard UART output signal The signal return path is DIG_GND Type I O Direction Output Pin 3 RX 0 The Transmit Signal for UART 2 This is a standard UART output signal The signal return path is DIG_GND Type I O Direction Input Pin 2 RX 1 The Receive Signal for UART 0 This is a standard UART input signal The signal return path is DIG_GND Type I O Direction Input Pin 6 RX 2 EV2_IN The Receive Signal for UART 1 This is a standard UART input signal The signal return path is DIG_GND Type I O Direction Input Pin 4 FREQ_OUT This is a Dual Mode Signal Normally this is the receive signal for UART 2 a standard UART receive signal Under software control it can also be used as general purpose I O or to detect events It can be used to detect the timing of the leading edge of the start bit of the incoming data stream The signal return path is DIG_GND Type I O Direction Input Output Pin 32 1PPS Optional Frequency Output Signal This is NOT the same signal as pin 39 This signal is turned off by default This is a complex signal which under software can provide any of either an NCO generated output frequency a PWM signal a GPS aligned EPOCH pulse or general purpose O signal The signal return path is DIG_GND Type I O Direction Input Output Pin 38 EVENT_IN The 1 Pulse Per Second Signal This is normally a 1 pulse aligned with GPS time but can under so
11. g switch mode power supply rather than the on board linear regulator If the source impedance of the power supply to the CW25 TIM is high due to long tracks filtering or other causes local decoupling of the supply signals may be necessary Care should be taken to ensure that the maxi mum supply ripple at the pins of the CW25 TIM is 50mV peak to peak 9 2 RF Connection The RF connection to the CW25 TIM can be done in two ways The preferred method is to use standard mi crostrip design techniques to track from the antenna element to the RF_IN castellation This also allows the sys tems integrator the option of designing in external connectors suitable for the application The user can easily fit an externally mounted MCX SMA or similar connector provided it is placed adjacent to the RF_IN castellation If the tracking guidelines given below are followed the impedance match will be acceptable The diagram below shows how this could be achieved In this diagram the centre via of the RF connector is presumed to be plated through with a minimal pad top and bottom The PCB material is assumed to be 1 6mm thick FR4 with a dielectric constant of 4 3 Two situations are considered one with no ground plane and one with a ground plane on the bottom of the board underneath the RF connector In both cases there is no inner layer tracking under the RF connector amp 9 Top Tracking if used i k E SMA Connector Figure 7 RF Tracking Examp
12. User selectable pulse width Event Input 30ns rms accuracy lt 10ns resolution Frequency Output GPIO 0 10 Hz to 30 MHz CW25 TIM Receiver Type 12 parallel channel x 32 taps up to 32 point FFT Channels taps and FFT can be switched off to minimize power or simulate simpler designs General Processor ARM 966E S on a 0 18u process at up to 120 MHz Note 1 The features listed above may require specific software builds and may not all be available in the initial release 2 Please contact factory for other temperature options Table 3 CW25 TIM Specification NA t Copyright 2009 NavSync Ltd All Rights Reserved Specifications subject to change without notice 2 SPECIFICATION continued 2 2 Recommended Ratings Symbol Parameter Min Max Units RF_3V3 RF Supply Voltage 3 0 3 6 Volts DIG_3V3 Digital Supply Voltage 3 0 3 6 Volts DIG_1V8 Digital Supply Voltage 1 65 1 95 Volts VBATT Battery Backup Voltage 2 7 3 5 Volts ANT_SUPPLY Antenna Supply Voltage 3 0 12 Volts Table 4 Recommended Maximum Ratings 2 3 Absolute Maximum Ratings Symbol Parameter Min Max Units RF_3V3 RF Supply Voltage 0 3 6 5 Volts DIG_1V8 Digital Supply Voltage 0 3 2 0 Volts DIG_3V3 Digital Supply Voltage 0 3 3 7 Volts VBATT Battery Backup Voltage 0 5
13. are versions can also configure this pin for general purpose I O or an additional PPS output The signal return path is DIG_GND GPIO 2 NEXT_INT Type I O Direction Input Output Pin 41 The GPIO 2 NEXT_INT output provides an active high status indicator for the Frequency Output available on pin 39 GPIO 0 PWM Custom software versions can also configure this pin for general purpose I O The signal return path is DIG_GND Note 4 USB is not supported in the current software build ae Copyright 2009 NavSync Ltd All Rights Reserved Specifications subject to change without notice 4 SIGNAL DESCRIPTION continued 4 5 I O Signals cont d GPIO 3 FREQ_IN Type VO Direction Input Output Pin 42 The GPIO 3 FREQ_IN output provides an active high status 3D fix indicator This indica tor can also be used to determine the validity of the pin 38 1PPS output The signal return path is DIG_GND 5 SPECIAL FEATURES While most of the features on the CW25 TIM are just a subset of the capabilities of the CW25 and so are de scribed in the CW25 Data Sheet and the CW25 User Manual there are some additional features specific to the CW25 TIM that require explanation 5 1 User Commands The CW25 TIM can accept a number of specific user commands for setting receiver parameters such as UART baud rate and NMEA message subset output frequency etc Many of these parameters are stored in Non Vola tile Memory NVM so that the setti
14. e Foote 03 8 20 07 Katie Foote Testing amp Evaluating update 04 04 23 08 Katie Foote Pin Revisions amp miscellaneous revisions 05 9 24 08 Katie Foote Temp amp dBW to dBm 06 01 22 09 Dave Jahr Remove Max Velocity amp Altitude Spec 07 03 26 09 Donal Geoghegan Demo Board Kit Information Table 1 Revision History Other Documentation The following additional documentation may be of use in understanding this document Document By Note CW25 User Manual NavSync CW25 Dev Kit User Manual NavSync Table 2 Additional Documentation List 4 yc ae Copyright 2009 NavSync Ltd All Rights Reserved Specifications subject to change without notice 1 INTRODUCTION The CW25 TIM is a small size GPS OEM module that has been optimized for precision timing applications The CW25 TIM leverages 12 288 correlators in the BB25IC baseband processor for low signal acquisition and tracking eliminating the need for an outdoor antenna in many applications Aside from low signal tracking the CW25 TIM s algorithms also support quick Time To First Fix TTFF in cold start conditions or when ephemeris and almanac data is available To optimize timing performance CW25 TIM fixes its position after initially acquir ing satellites and performing a survey When the position is fixed even in severely degraded signal conditions the CW25 TIM can continue to provide a time solution with only one available satellite With a size of just over an inch
15. er external logic but care must be taken not to inject noise onto this signal No more than an additional 50mA may be taken from this signal by external logic DIG_GND Type Power Direction Input Output Pin 35 The Digital Ground This is the return path for the DIG_3V3 supply and the ground reference for all the digital I O The DIG_GND must be tied to the RF_GND externally to the CW25 TIM 10 ae Copyright 2009 NavSync Ltd All Rights Reserved Specifications subject to change without notice 4 SIGNAL DESCRIPTION continued 4 1 Power Signals cont d VBATT Type Power Direction Input Output Pin 27 4 2 RF Signals RF_IN The Battery Backup Supply The CW25 TIM has an on board Real Time Clock RTC This is powered from the VBATT signal A supply of typically 3v greater than 2 5V and less than DIG_3V3 should be applied to this signal This signal can be left floating if not required The input has a blocking diode and so rechargeable batteries will need an external charging circuit Typically a 1K resister in series with this signal and the external battery will provide an easy method of measuring the current consumption from VBATT during test Type RF Direction Input Pin 24 TRIM The RF Input Signal This attaches to the GPS antenna Standard RF design rules must be used when tracking to this signal This signal has an RF blocked connection to the ANT_SUPPLY signal This is the same signal prese
16. ftware control also provide general purpose I O or an additional event input The pulse width of the 1PPS is software selectable with a default of 100us The signal return path is DIG_GND Type I O Direction Input Output Pin 37 The Event Input Signal This is normally an event timer or counter Events are timed against GPS time Under software control this input can be used as an external 48 MHz input for the USB interface or this input can also be used for general purpose I O The signal return path is DIG_GND f s Copyright 2009 NavSync Ltd All Rights Reserved Specifications subject to change without notice 14 4 SIGNAL DESCRIPTION continued 4 5 I O Signals cont d N2WCK Type I O Direction Input Output Pin 28 The NavSync 2 Wire Clock Signal This is the open collector I2C compatible Clock Sig nal for the 2 wire serial interface The signal return path is DIG_GND N2WDA Type I O Direction Input Output Pin 29 The NavSync 2 Wire Data Signal This is the open collector 12C compatible Data Signal for the 2 wire serial interface The signal return path is DIG_GND USBP Type I O Direction Input Output Pin 30 The positive USB Signal The signal return path is DIG_GND USBN Type I O Direction Input Output Pin 31 The negative USB Signal The signal return path is DIG_GND LED_RED Type I O Direction Output Pin 8 This is a Dual Function Signal Normally this signal is used to drive a red LED
17. ints on the rise time of the NPOR signal There is a second reset signal on the CW25 NAV the NRESET signal NRESET is also an active low open collector signal This signal is generated by the BB25IC in response to the NPOR signal It can also be generated under software control Asserting the NRESET signal from an external open collector source will reset the ARM9Q in the BB25IC without resetting the whole chip Generally this signal will be left open 9 8 Boot Options The CW25 NAV has two boot modes These are selected by the state of the BOOTSEL signal when the NPOR signal goes inactive high Normally BOOTSEL is left open so that a pull up bias in the BB25IC will keep that signal high When BOOTSEL is high the CW25 NAV boots from the FLASH that is internal to the BB25IC If BOOTSEL is tied low the CW25 NAV boots from the ROM internal to the BB25IC This ROM has a boot loader that polls the serial ports and I2C bus for boot code This mode of operation requires special user handling and should only be used in conjunction with specific application notes 9 9 Demo Board Kit Information A CW25 Demo board is available for evaluation of the CW25 Receiver A full kit contains the Demo Board with mounted CW25 TIM or CW25 NAV RS232 serial Cable Power Supply Adaptor Region Specific with a 2 1 mm DC plug and a 3m TNC Magnetic Patch Antenna To reduce costs the CW25 Demo Board can be purchased separately with a pick and choose option for above accesso
18. le r Ground Plane The widths of the RF_IN track and the associated gaps are given in the table below Without ground plane 37 6 56 8 With ground plane 32 6 43 8 Table 7 RF Track amp Gap Widths Alternatively the user can attach the antenna to the Hirose H FL R SMT using a flying lead fitted with a suitable plug a Copyright 2009 NavSync Ltd All Rights Reserved Specifications subject to change without notice 9 APPLICATION HINTS continued 9 3 Grounding In connecting the CW25 TIM into a host system good grounding practices should be observed Specifi cally ground currents from the rest of the system hosting the CW25 TIM should not pass through the ground connections to the CW25 TIM This is most easily ensured by using a single point attachment for the ground There must also be a good connection between the RF_GND and the DIG_GND signals While there is not a specific need to put a ground plane under the CW25 TIM high energy signals should not be tracked under the CW25 TIM It is however recommended that a ground plane be used under the CW25 TIM In this case the following would be an example of the pattern that may be used Double via to host system ground at this one point Digital and RF grounds common at this point
19. ngs are retained when the receiver loses power The available commands are defined in detail in the CW25 User Manual 5 2 Self Survey To optimize timing performance the CW25 TIM performs a 10 minute survey each time the receiver is powered up and after obtaining a GPS fix When the survey is complete the receiver automatically enters fixed timing mode For applications with specific timing performance requirements it may be necessary to allow the survey to complete before using the 1PPS and frequency outputs The status of the survey can be determined by que rying the receiver dynamics setting as described in the CW25 User Manual 5 3 CW25 TIM Embedded Identification The hardware version number is hard coded onto the CW25 TIM firmware also contains a version number allow ing for easy identification of the hardware and software version in embedded applications 6 TAPE AND REEL SPECIFICATIONS I Measured from center line of sprocket hole to center line of pocket Il Cumulative tolerance of 10 sprocket holes is 0 20 Ill Measured from center line of sprocket hole to center line of pocket IV Other material available ALL DIMENSIONS IN MILLIMETERS UNLESS OTHERWISE STATED General Tolerance 0 2 Drawing not to Scale Figure 5 Tape and Reel Copyright 2009 NavSync Ltd All Rights Reserved Specifications subject to change without notice IN N _ 7 SOLDER PROFILE 300 250 Peak
20. ntains no over voltage or reverse polarity protection The CW25 NAV should be handled as a CMOS component with full antistatic handling precautions Any fault condition that results in the maximum limits being exceeded may irreparably damage the CW25 NAV 9 6 LEDs There are two connections on the CW25 NAV specifically intended to drive status LEDs The LED_RED and LED_GRN signals should be connected via suitable current limiting resistors to the anodes of low current LEDs whose cathodes are connected to DIG_GND The outputs are standard 3 3V CMOS and the current drawn should be limited to 5mA per output Using a 270 ohm resistor provides a suitable current limit If appropriately coloured LEDs are attached to these signals other documentation eg user manuals that refers to these status LEDs will be correct If LEDs are not required these signals can be left open These signals may be connected to other logic if required 9 7 Reset Generation The power on reset for the CW25 NAV is generated on board It is generated by the regulator for the RF section This signal is an active low open collector signal and is presented on the NPOR castellation If it is desired to extend the power on reset signal or provide a manual reset for the CW25 NAV this signal can be driven from an open collector source at any time The nPOR signal of the BB25IC to which the NPOR castellation is connected has a Schmitt trigger input This means that there are no constra
21. nted on the RF connector on the CW25 TIM Only one antenna connection should be made If the RF connector is to be used then there should be no connection even an unconnected pad to this castella tion Type RF Direction Input Pin 12 EXT_CLK This signal trims the output frequency of the VCTCXO This signal is normally left open When floating this signal is biased to the control voltage of the VCTCXO Any noise in jected into this signal will severely compromise the performance of the CW25 TIM This signal should only be used in conjunction with specific application notes Type RF Direction Input Pin 7 This input is the external clock input This signal is to be used only in special builds of the CW25 that are not fitted with an internal VCTCXO For the normal build contain ing the VCTCXO do not connect this input The external clock is a 9 MHz to 26 MHz clipped sinewave input with an amplitude between 1V and 3V peak to peak The return path for this signal is RF_GND 4 3 Emulation Test Signals TDI Type Test Direction Input Pin 14 The Test Data In Signal This is the standard JTAG test data input The signal return path is DIG_GND TDO Type Test Direction Output Pin 13 The Test Data Out Signal This is the standard JTAG test data output The signal return ath is DIG_GND TCK Type Test Direction Input Pin 20 Copyright 2009 NavSync Ltd All Rights Reserved Specifications subject to change
22. put Pin 16 NRESET The Power On Reset Signal This active low open collector signal is the master reset for the CW25 TIM The CW25 TIM can be held in reset by asserting this signal The signal can be used to reset external circuitry but care must be taken to ensure no DC current is drawn from this signal as the internal pull up resistor value is 100K Type Control Direction Input Output Pin 10 BOOTSEL The System Reset Signal This active low open collector signal is generated by the BB25IC chip in response to the assertion of the NPOR It may also be driven to reset the ARMS processor in the BB25IC without completely re initializing the chip Type Control Direction Input Pin 11 The Boot Select Signal The BB25IC has four boot up modes but only two are sup ported by the CW25 TIM This signal is sampled when the NPOR is de asserted If the BOOTSEL signal is high or left floating then the CW25 TIM boots from its on chip FLASH memory If the BOOTSEL signal is pulled low the CW25 TIM boots from its on chip ROM an Copyright 2009 NavSync Ltd All Rights Reserved Specifications subject to change without notice 4 SIGNAL DESCRIPTION continued 4 5 I O Signals TX 0 Type I O Direction Output Pin 1 TX 1 The Transmit Signal for UART 0 This is a standard UART output signal The signal return path is DIG_GND Type I O Direction Output Pin 5 TX 2 The Transmit Signal for UART 1
23. ries See CW25 Demo User Manual for more detailed information on this unit Please contact NavSync for pricing information on the full kit or individual items Copyright 2009 NavSync Ltd All Rights Reserved Specifications subject to change without notice NAvsync CW25 TIM NavSync Ltd Europe Bay 143 Shannon Industrial Estate Shannon Co Clare Ireland Phone 353 61 475 666 E mail sales navsync com North America 2111 Comprehensive Drive Aurora IL 60505 USA Phone 630 236 3026 E mail northamerica navsync com www navsync com
24. rnally to the CW25 TIM RFV_OUT Type Power Direction Output Pin 17 The output from the LDO regulator that is powered by the RF_3V3 signal This sup plies the power to the RF subsystem of the CW25 TIM This may also be used to power external RF components but care must be taken not to inject noise onto this signal No more than an additional 30mA may be taken from this signal by external ANT_SUPPLY Type Power Direction Input Pin 26 The Antenna Supply Voltage This may be used to supply power to the RF_IN signal for use by an active antenna The maximum voltage should not exceed 15V and the current should be limited to 50mA DIG_3V3 Type Power Direction Input Pin 36 The Digital Supply Input This 3 3V 10 input supplies the I O ring of the BB25IC chip and the LDO regulator in the digital section of the CW25 TIM It is important that this supply is well filtered with no more that 50mV peak to peak noise with re spect to DIG_GND DIG_1V8 Type Power Direction Input Pin 34 The 1 8V 5 digital core supply for the BB25IC This is normally connected direct ly to the 1V8_OUT signal However if an external 1 8V 5 is available a lower overall system power consumption may be achieved by using an external supply 1V8_OUT Type Power Direction Output Pin 33 The 1 8V output from the LDO regulator that is powered by the DIG_3V3 signal Normally this is connected to the DIG_1V8 signal This may also be used to pow
25. s t Copyright 2009 NavSync Ltd All Rights Reserved Specifications subject to change without notice 2 SPECIFICATION 2 1 Performance Physical Module dimensions 25mm D x 27mm W x 4 2mm H Supply voltages 3V3 Digital 1 0 3V3 RF 1V8 Core option 3V Standby Battery Operating Temp 30 C to 80 C Storage Temp 40 C to 85 C Humidity 5 to 95 non condensing Max Acceleration Jerk Ag 1gs sustained for less than 5 seconds Sensitivity Acquisition w network assist 155dBm Tracking 156dBm Acquisition Stand Alone 143dBm Acquisition Hot Start with network assist Outdoor lt 2s Time Indoor 148dBm lt 5s Stand Alone Outdoor Cold lt 45s Warm lt 38s Hot lt 5s Reacquisition lt 0 5s 90 confidence Accuracy Position Outdoor Indoor lt 5m rms lt 50m rms Velocity lt 0 05ms Latency lt 200ms Raw Measurement Accuracy Pseudorange lt 0 3m rms Carrier phase lt 5mm rms Tracking Code and carrier coherent Power 1 fix per second 0 6W typically Coma Mode Current 10mA RF3V3 DIG 3V3 Standby Current VBATT 1 5yA Interfaces Serial 3 UART ports CMOS levels Multi function O 1PPS and Frequency Output available on GPIO 0 Event Counter Timer Input Up to 4 x GPIO multi function 2 x LED Status Drive C External Clock on special build Protocols Network Assist NMEA 0183 Proprietary ASCII and binary message formats 1pps Timing Output 30ns rms accuracy lt 5ns resolution
26. square 25 x 27 mm and provided as a tape and reel component the CW25 TIM is specifically designed to be integrated with Communications devices such as GSM CDMA UMTS mo dems or any other communications medium The CW25 TIM is optimized for the output of time frequency information Another aid to integration is the ability to store users software code in the CW25 TIM reducing the need for external memory and processors Key Features of the CW25 TIM include e 25 ns accuracy to UTC e Enables indoor use 155 dBm acquisition with network assist 156 dBm tracking 143 dBm acquisition stand alone e Rapid Time To Fix lt 2 second outdoors lt 5 second indoors 148dBm e Stand alone CW25 TIM module No GPS knowledge required for hardware integration e 25mm x 27 mmx 4 2 mm This document the CW25 TIM Data Sheet provides information on the Hardware and Software Elements of the CW25 TIM Key information includes e System Block Diagram e Maximum Ratings e Physical Characteristics CW25 TIM Dimensions castellation information Solder Pad and placement information e Signal Descriptions e Special Features e Application Information Power supply modes RF connections Grounding Battery Back up Over Voltage and Reverse Polarity LED s The specifications in the following sections refer to the standard software builds of the CW25 TIM The perfor mance and specification of the CW25 TIM can be modified with the use of customized software build
27. without notice 12 4 SIGNAL DESCRIPTION continued 4 3 Power Signals cont d TMS The Test Clock Signal This is the standard JTAG test clock input The signal return path is DIG_GND Type Test Direction Input Pin 22 JTAGSEL RTCK The Test Mode Select Signal This is the standard JTAG test mode input The signal return path is DIG_GND Type Test Direction Input Output Pin 21 NTRST This is a Dual Function Signal When the NPOR signal is asserted low this signal is an input and selects the function of the JTAG interface When high JTAG emulation into the embedded ARMS processor is selected When low the BB25IC chip boundary scan mode is selected The value on this signal is latched when NPOR de asserts goes high When NPOR is de asserted high and the JTAG emulation mode has been latched this signal provides the return clock to the ARM Multi ICE Because the ARMS9 functions off a single clock domain the TCK has to be internally synchronized in the ARM9 This can cause a variable length delay in the validity of the TDO signal The RTCK is a synchro nized version of the TCK signal The Multi ICE uses the RTCK output signal to indicate when the TDO signal is valid The signal return path is DIG_GND Type Test Direction Input Pin 15 The Test Reset Signal This is the active low JTAG test reset signal The signal return path is DIG_GND 4 4 Control Signals NPOR Type Control Direction Input Out

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