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GPS Module GE675

Specifications Sheet V0.2

Features :

  • SiRF StarIV internal ROM-based ultra low power chipset
  • Compact module size for easy
    integration : 14.7 x 13.1 x 5 mm
  • GE675 smart antenna module provide an I2C compliant
    interface to connect an optional external serial
    * 1 EEPROM to store power-up configuration settings
  • Operating at 1.8V signal level
    * 1 Please refer to the related External EEPROM Application Note

1. Introduction

The GE675 is a high sensitivity, low power and very compact smart antenna module,
with built in GPS receiver. This 48-channel global positioning system (GPS) receiver is designed
for a wide range of OEM applications then based on the fast and deep GPS signal search
capabilities of SiRFstarIV GSD4e ROM chipset, SiRF's newest chipset technology. The GE675

provides flexible I/O interfaces (UART, I2C and SPI which can be defined by customer). GE675 is designed to allow quick and easy integration into GPS-related applications such as:

  • PDA, MID, and other portable devices
  • Car and Marine Navigation
  • Fleet Management / Asset Tracking
  • AVL and Location-Based Services
  • Hand-Held Device for Personal Positioning and Navigation

1.1 Features
1.1.1 Performance

  • High Performance Solution:
    - High sensitivity navigation engine (PVT) tracks as low as -160dBm
    - 48 track verification channels
    - SBAS (WAAS or EGNOS)
  • Active Jammer Remover:
    - Removes in-band jammers up to 80 dB-Hz
    - Tracks up to 8 CW jammers
  • Multimode A-GPS (Autonomous, MS-Based, and MS-Assisted) - With operator support
  • *2 Embedded CGEE / SGEE (With back-end server support) speed up TTFF a lot and makes cold start time to be around 20+ seconds
  • SiRFGeoRecov™ Reverse EE makes positioning process being done under power saving mode.
  • RF Metal Shield for best performance in noisy environments
    (*2, Above features should be combined with external EEPROM, please refer to application note.)

1.1.2 Interface

  • Multiple host interfaces (UART, I2C, and SPI)
  • Secondary I2C port for MEMS connection
  • Protocol: NMEA-0183 (default)

1.2 Advantages

  • Built-in LNA.
  • Built-in internal ROM and based on Firmware 4.x.x
  • *3 Embed CGEE (Client Generated Extended Ephemeris) that can capture ephemeris data from satellites locally and predicts ephemeris out to 3 days. So if the module was off within 3 days, it could complete positioning process with limited time just like hot start.
  • It can remove in-band jammer up to 80db-Hz and track up to 8CW jammers, so the module can prevent GPS signal interference when design-in the electrical device with noisy electrical signal interferences such as Laptop, mobile phone, DSC, etc.
  • Tracking sensitivity as low as -163dBm, even without network assistance.
  • Support SiRF Aware technology
    • Support adaptive "Micro Power Controller" power management mode
    • *4 Support MEMS sensor through I2C interface. (V4.X.X firmware is available for now)
    • MEMS interrupt can improve Micro Power Mode performance.
    • Only 8mW Trickle Power, so user can leave power on all day instead of power off
  • Suitable for battery drive devices that need lower power consumption application
  • Cost saving through elimination of RF and board to board digital connectors
  • Flexible and cost effective hardware design for different application needs
    (*3/*4, Above features should be combined with external EEPROM, please refer to application note.)

1.3 Block Diagram

*5 EEPROM(optional) : The external EEPROM can be part of storage for SiRFstat IV GSD4e, which can add-on more features and benefits for GE675 GPS application.

2. Specifications
2.1. Technical specifications

Feature Item Description
Chipset GSD4e /ROM base SiRF StarIV -ROM core logic
General Frequency L1, 1575.42 MHz
C/A code 1.023 MHz chip rate
Channels 48
Sensitivity -160dB *
Accuracy Position <2.5 meters
Velocity 0.1 meters/second
Time 1 microsecond synchronized to GPS time
Datum Default WGS-84
Other selectable for other Datum
Time to First Fix
(TTFF @-130 dBm)
Reacquisition 0.1 sec., average
Snap start 1 sec., average
Hot start 1~2 sec.
Warm start 9~15 sec. *
Cold start 2 5 ~35 sec. *
Dynamic
Conditions
Altitude 18,000 meters (60,000 feet) max.
Velocity 515 meters/second (1000 knots) max.
Acceleration 4g, max.
Jerk 20 meters/second3, max.
Power Main power input 1.71 ~ 1.89 VDC input
Power consumption Average: 46mA (Tracking Mode)
Backup Power 1.71 ~ 1.89 VDC input
Serial Port Electrical interface UART/I2C/SPI
Protocol messages NMEA-0183
Antenna Patch Antenna 12 * 1 2* 2 mm
Gain -1.22 dBic Max* (@ Zenith)
Polarization Right Hand Circular Polarization
Bandwidth 10 MHz Min* (@ -10dB)
Axis Ratio ≤ 5.5 dB*
* Based on ground size 60* 60 mm2 size

* With external EEPROM

2.2 Electrical Specifications

2.2.1 Pin Location

PIN NAME DESCRIPTION
1 GND Ground
2 VSTBY DC +1.8V input, RTC backup battery input
3 TIME MARK 1 PPS time mark output.
4 CTS SSPI_CLK: slave SPI clock input
CTS: clear to send , active low
5 RTS SSPI_SS_N: slave SPI chip select, active low
RTS: ready to send, active low
6 TXA SSPI_DO: slave SPI data output
TX: data transmit
I2C_CLK: I²C bus clock
7 RXT SSPI_DI: slave SPI data input
RX: data receive
I2C_DIO: I²C bus data
8 WAKEUP External Control for LNA or memory, active high
9 ON-OFF Power control pin
10 RESET System reset (active low)
11 EIT Interrupt
12 DIO MEMS_I2C_DIO: MEMS I²C bus data
13 CLK MEMS_I2C_CLK : MEMS I²C bus clock
14 VCCIN DC +1.8V input

2.3 Environmental Characteristics

Items Description
Operating temperature rage -40 deg. C to +85 deg. C
Storage temperature range -55 deg. C to +100 deg. C
Humidity Up to 95% non-condensing or a wet bulb temperature of +35 deg. C

2.4 Physical Characteristics

Items Description
Length 14.7 mm ± 0.3mm
Width 13.1 mm ± 0.3mm
Height 4.96 mm ± 0.3mm
Weight 3 g

2.5 Interface Specifications

Items Description
I/O 14 pin connector type
Serial I/O UART, I2C, SPI by customer request

Serial I/O :
Item Communications Speed
UART 4800~115200 bps
I2C 400K bit/s (MAX)
SPI 4000K bit/s (MAX)

2.6. Reference design
Power Supply :

BUS Interface :

All ground pads attach to ground plane through via directly.

♦ TM(Time Mark) : when GPS is fixed, the cycle will be shown as below :

3. Software

The GE675 includes GSW4e, the SiRF standard GPS software for SiRFstarIV low power single chipset receivers and its features include:

  • Excellent sensitivity
  • High configurability
  • 1 Hz / 5Hz position update rate
  • Supports use of SBAS (satellite-based augmentation systems) ,WAAS, EGNOS
  • Enhanced Navigation Performance
  • Improved Jamming Mitigation
  • Improved Ephemeris Availability
  • Default configuration is as follows:
    Item Description
    Core of firmware SiRF GSW4e_4.X.X
    Baud rate 4800 bps
    Code type NMEA-0183 ASCII
    Datum WGS-84
    Protocol message GGA(1sec), GSA(1sec), GSV(5sec), RMC(1sec)
    Output frequency 1 Hz

4. Electrical specifications

4.1 Outline Drawing

♦ Tolerance

Length 14.7±0.3mm
Width 13.1±0.3mm
Height 4.96±0.3mm

5. Appendix

5.1 GE675 14p connector specification, Please refer follwing:

FPC CONNECTOR SMD P0.5mm