GPS-PS1-S-DL - U-blox AG

µ-blox GPS-PS1

GPS Receiver Board based on SiRFstar I/LXTM

-Datasheet-

June 29, 1999

1 Features

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Full Implementation of the SiRFstar I/LXTM

Architecture, Including:

- GRF1/LX Low-power RF front-end IC

- GSP1/LX Low-power GPS DSP with

Integrated Real Time Clock (R TC)

- Hitachi RISC CPU SH-7020

- 1 MBit SRAM

- 4 MBit FLASH memory

- Low Noise Amplifier

- Filter, Crystals, etc.

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Differential GPS (RTCM-SC104) input

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Dim ensions: 82.5mm × 32mm × 8.5mm

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M/A-Com SSMT coax connector for RF-Input or

standard SMB

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Bias Voltage for active antenna 4.75V

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2 bi-directional Serial Interfaces

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Operating voltage 5 Volts, 0.75 Watt

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Industrial operating temperature range

(−40 - +85°C)

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Minimum external requirements:

- 5 Volt power supply, 0.75 Wa tt

- Backup battery for real time clock and SRAM

- Serial interface for NMEA or SiRF binary data

- Passive or active Antenna

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Customer specific code can be implemented

on the Hitachi SH-1 processor using the µ-blox

Software Customization Kit.

µ-blox ag

Gloriastra sse 35

CH-8092 Zürich

Switzerland

http://www.u-blox.ch

Datasheet GPS-PS1 µ-blox AG, June 29, 1999 Page 3

Revision History

Date Section Changes

Mar. 16,98 Initial version

Mar. 18, 98 Section 6

Table 8 Complete sec t ion added.

Vbat connect ion spe cificat ion f or unused c a se added.

July 29, 98 Layout New Font, all table s sm a ll f ont

Table 9: Matching Connectors Complete table added

Figure 2 Figure added

Section 3 & Table 2: Orde ring Options Options changed

Dec. 10, 98 Section 4 Text changes.

June 23, 99 Version GPS-DS-0699 new Layout, Flash size up-dated, Ordering options added, Figure External wiring added

Table 1: Revision History

All Trademarks mentioned in this document are property of their respective owners.

THIS DATASHEET CONTAINS INFORMATION ON µ-blox PRODUCTS IN THE SAMPLING AND INITIAL PRODUCTION PHASES OF DEVELOPMENT. THE

SPECIFICATIONS IN THIS DATASHEET ARE SUBJECT TO CHANGE AT µ-blox' DISCRETION. µ-blox ASSUMES NO RESPONSIBILITY FOR AN Y CLAIMS OR D AMAGES

ARISING OUT OF THE USE OF THIS DATASHEE T, OR FROM THE USE OF MODULES BASED ON THIS DATASHEET, INCLUDING BUT NOT LIMITED TO CLAIMS OR

DAMAGES BASED ON INFRINGEMENT OF PATENTS, COPYRIGHTS OR OTHER INTELLECTUAL PROPERTY RIGHTS. µ-blox MAKES NO WARRANTIES, EITHER

EXPRESSED OR IMPLIED WITH RESPECT TO TH E INFORMATION AND SPEC IFICATIONS CONTAINED I N THIS DAT ASHEET. PERFORMANCE CHARACT ERISTICS LISTED

IN THIS DATASHEET ARE ESTIMATES ONLY AND DO NOT CONSTITUTE A WARRANTY OR GUARANTEE OF PRODUCT PERFORMANCE.

Datasheet GPS-PS1 µ-blox AG, June 29, 1999 Page 4

2 Overview

GPS-PS1 is a fully self-contained receiver module for the Global Positioning System (GPS). Based on the

SiRFstar I/LXTM chip set manufactured by SiRF Technology, Inc., the module supports all features, and

maintains the technical specif icatio ns of the SiR Fstar I/LXTM architecture.

Reset

Voltage

Regulator

XTAL IF

Filter

GRF1/LX

Front-End

GPS-Data

AGC

Clock XTAL

LNA RF

Filter

A ddress B us

Data Bus

ntenna

Input

Clock

S e r ia l I/Os [ A :B] T ime ma r k

Power

5 Volts

Backup

Battery

GPS-PS1

µP

SH-1

Hitachi SRAM

1MBit FLASH

4MBit

RTC

Processor

GSP1/LX

Signal

Figu re 1: Bl oc kdi agram o f GP S-P S1

The module, which is 82.5mm × 32mm in size, provides complete GPS signal processing from antenna

input to serial data output (NMEA or SiRF proprietary data format). A second serial port accepts differential

GPS data (RTCM).

The receiver runs at an external operating voltage of 5 Volts. Internally this is converted to the operating

voltage of 3.3 Volts, so the module consumes less than 0.75 Watts in continuous operation mode.

Featuring the GRF1/LX RF front-end chip and an integrated Low-Noise Amplifier (LNA), the module

connects seamlessly to low-cost passive antennas. Active antennas can be connected to the GPS-PS1 as

well. An a ntenna bia s volta ge (4.75V) i s int erna lly gene rat ed. Suf ficient CP U pow er of t he module' s H itachi

SH-1 RISC CPU allow integration of additional customer specific functionality. For many applications, the

functionality of an external micro-controller can be transferred to GPS-PS1. The µ-blox Software

Customization Kit is required to change the firmware or implement additional functionality on the on-

board microprocessor.

Datasheet GPS-PS1 µ-blox AG, June 29, 1999 Page 5

3 Product Lineup

For the GPS-PS1 an integrated datalogger is available as an ordering option. This option enables the user to

take advantage of the on-board FLASH memory to store position data.

The standard GPS-PS1 is supplied in the following start-up configuration:

- SiRF binary protocol

- 19’200 Baud

- 8 data bits, 1 stop bit, no parity

A utility available at the µ-blox homepage enables you to download new firmware up-dates and start-up

configurations to your µ-blox GPS receiver.

Refer to Table 2 for ordering information. Options are available in higher quantities.

Option Features

None Standard version with M/A-Com SSMT/OSMT antenna connector

S SMB antenna connector instead of SSMT/OSMT

DL Adds datalogging capability

Table 2: Ordering Options

Ordering example: GPS-PS1-S-DL GPS-PS1 with datalogger and SMB connector.

4 Operating Modes

In the current version of the GPS-PS1 the TricklePower mode is not implemented. In Normal Mode, the

module is continuously running as long as the operating voltage Vcc is supplied. Position fixes are

generated at the maximum update rate. An external backup battery must be connected to enable the

module to keep the internal Real T ime Clock running and to hold the SRAM data (ephemeris and almanac

data) during power supply interruption. Use of an external backup battery is recommended to reduce the

system's startup time. However, under good visibility conditions cold- and warm start times do not differ

significantly.

4.1 Customized Operation

The Hitachi SH-7020 RISC-CPU provides enough computational power to allow the implementation of

additional customer specific software into the module. The current datasheet only provides basic

information on the availability of I/O signals to the customer's appl ication. In order to implement software

on the on-board processor the Software Customization Kit (GPS-SCK) is required. The Software

Customization Kit includes a development platform (compiler) and a sub-license of the firmware on the

receiver. Contact µ-blox for a detailed discussion of the feasibility of implementing a particular application.

5 Technical Specifications

5.1 Electrical Specifications

5.1.1 Absolute Maximum Ratings

Parameter Symbol Min Max Units

Power Supply Voltage Vcc -0.3 16 V

Input Pin Voltage Vin -0.3 6 V

Storage Temperature Tstg -55 125 °C

Table 3: Absolute Maximum Ratings

Datasheet GPS-PS1 µ-blox AG, June 29, 1999 Page 6

Stressing the device beyond the “Absolute Maximum Ratings” may cause permanent damage. These are

stress ratings only.

! GPS-PS1 is not protected against overvoltage or inverse voltages. If necessary, voltage spikes exceeding

the power supply voltage specification, given in table above, must be reduced by using appropriate

protection diodes.

5.1.2 Operating Conditions

Parameter Symbol Min Typ Max Units

Power Supply Voltage Vcc 4.515.0 5.5 V

Power Supply Voltage Ripple Vcc 100 mV

Backup Battery Voltage Vbat 2.0 3.6 V

Input Pin Voltage Vin 0 Vcc V

Supply Curre nt Icc 150 mA

TricklePower Sleep Mode Supply

Current Itps 0.5 mA

Standby Battery Current Ibat 20 µA

Operating Temperature Topr -40 85 °C

Table 4: Operating Conditions

Operation beyond the “Operating Conditions” is not recommended and extended exposure beyond the

“Operating Conditions” may affect device reliability.

5.2 Pin Description

Please s ee Table 5 for the pin identification for the 2 connectors of the GPS-PS1.

Pin Type Name

1 O TX_B

2I Vcc

3 O TX_A

4I Vbat

5I RX_A

6 O TIMEMARK

7I RX_B

8I GND

Table 5: Pin Identification CON A

Pin Type Name

1 NC (reserved)

2 I/O RESET

3 NC (reserved)

4 NC (reserved)

5 NC (reserved)

6 NC (reserved)

7 O Vcc 3.3V

8 I Test_I

Table 6: Pin Identification CON B

1 Without active antenna, wi th acti v e antenna 4.9 V

Datasheet GPS-PS1 µ-blox AG, June 29, 1999 Page 7

5.2.1 Serial Interface Signals

All serial interface signals TX_A, RX_A, TX_B and TX_B operate on 3.3V CMOS compatible signal levels. The

Inputs RX_A and RX_B are 5V tolerant. The outputs are also 5V TTL compatible. If RS-232 compatible signal

levels are required an external driver (e.g. MAX232) must be provided.

Default operation includes sending out SiRF binary data format compatible position data on Serial Port A

and accept ing RT CM SC-1 04 diff ere ntial cor rection dat a on Se rial P ort B. NMEA 018 3 po sit ion data for mat

can optionally be used instead of SiRF binary data format. See the µ-blox GPS receiver protocol

specifications for detailed information on the serial protocols.

The configurat ion of the re ceiver ca n also be change d by usi ng the Si RF binary com municatio n protoc ol. In

order to change the default start-up configuration of the receiver, the firmware on the receiver has to be

up-dated. During this up-date the default start-up configuration is set.

Unused Serial Input Ports should be pulled-down.

Port Baud Rate

A and B 4800

9600

19200 (default)

38400

Table 7: Available Baud rates

Using SiRF binar y protocol, the lowest bau d rate t hat ca n be ac hieved is 9600. NMEA pr otocol allow s using

baud rates down to 4800, depending on the messages used. Special Function Signals

A 1PPS2 signal is available at the timemark pin. This signal is 3.3V CMOS and 5V TTL compatible.

5.2.2 Special Power Pins

A DC-bias voltage for an active antenna is supplied internally. Typically, the voltage required by an active

antenna is 4.5V or 5V. The bias voltage supplied by the GPS-PS1 is 4.75V.

An external back up batte ry must be connect ed to pin Vbat. This enables RTC operation and SRAM backup

and allows GPS warm or hot starts after power supply interruption.

Pin Signals Description

Se rial I/O

1,3,5,7 TX_A, RX_A,

TX_B, RX _B, Serial I/O ports. In default configuration, GPS data is outpu t on

port A, DGPS data is input on port B.

Special Functions

6 TIMEMARK 1 pulse per second (1PPS) signal of GPS-PS1.

Power Pins

2 Vcc 5V Supply Voltage

8 GND Module Ground

4 Vbat Backup voltage supply for RTC and SRAM. Connect to GND, if

not used.

Table 8: GPS-PS1 Signal Description

2 1 pulse-per-second

Datasheet GPS-PS1 µ-blox AG, June 29, 1999 Page 8

6 How to Make it Run

The following are the minimum outside connections one has to provide to allow basic operation of

GPS-PS1. If you plan to use more of GPS-PS1's functionality within your application, please contact µ-blox

support.

1. Antenna Use a cable fitted with M/A-Com SSMT coaxial connector to connect the antenna to the

module (see Table 9). For the GPS-PS1-S version use a SMB connector.

2. Power Connect Vcc pin 2 to 5V. And, con nect GN D pin 8 to ground . No s pecial de couplin g capa citors

are ne ce ssar y. T he powe r supply sh oul d be capa b le of de li ve ring a su sta ined cur r ent of a t lea st 15 0m A.

A proper RESET signal is internally generated.

3. Serial Interface Pins 1,3,5 and 7 (RX_[A:B] and TX_[A:B]) are 3.3V CMOS compatible. The RX inputs

are also 5V tolerant. The TX outputs are also 5V TTL compatible. If you need different voltage levels,

use appropriate level shifters. E.g. in order to obtain RS-232 compatible levels use the 3V compatible

MAX232 from Maxim or equivalent. GPS data will come out of port A. You can use port B to feed in

DGPS correction data. Connect the RX pin of any unused serial interface to GND.

4. Backup Battery Connect a backup battery to pin 4 (Vbat) if you intend to use this feature. You can

also use a supercap. The voltage at this pin can be anywher e between 2.0V and 3.6V. For chargi ng of

the supercap, connect its positive pole through a diode to Vcc. If you don't intend to use a backup

battery, connect this pin to GND.

5. 1PPS Signal On pin 6 (TIMEMARK), a one-pulse-per-second signal is available.

That's all!

Datasheet GPS-PS1 µ-blox AG, June 29, 1999 Page 9

7 Mechanical Specifications

Figure 2 shows the mechanical dimensions of the module.

Figure 2: Mechanical Dimensions GPS-PS1 (with M/A-Com SSMT connector)

The we ight of the mo dule is a pproxima tely 133 grams including the metal shield. See Table 9 for matching

RF connectors for the GPS-PS1.

Connector on module Matching Connector

AMP MicroMatch 215079-8 Ribbon connector AMP215083-8

M/A-COM SSMT plug

receptable M/A-COM SSMT/OSMT Right Angle Jack Pigtail

Part Number 9960-2100-24

SMB connector male SMB connector female

Table 9: Matching Connectors

Check URL below for mo r e information:

M/A-COM RF-Connectors: WWW: http://www.macom.com

AMP MicroMatch Series WWW: http://www.amp.com

3 16 grams with SMB connector (GPS-PS1-S)

Datasheet GPS-PS1 µ-blox AG, June 29, 1999 Page 10

Figure 3: Mechanical Dimensions GPS-PS1-S (with SMB connector)

Datasheet GPS-PS1 µ-blox AG, June 29, 1999 Page 11

Figure 4 shows the recommended footprint.

Figure 4: Recommended Footprint

Datasheet GPS-PS1 µ-blox AG, June 29, 1999 Page 12

8 Related Documents

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GPS-xS1 Protocol Specificati on

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Logging Option on µ-blox GPS receivers

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Performance of µ-blox GPS receivers Application Note

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GPS-xS1 Firmware Update Manual

All these documents are availabl e on our ho mepage (http://www.u-blox.ch).

9 Contact

For further information contact:

Technical Support

µ-blox ag

Gloriastr a sse 35

CH-8092 Zürich, Switzerland

Phone: +41-1-6327535

FAX: +41-1-6321210

E-mail: gps@u-blox.ch

WWW: http://www.u-blox.ch