User manual

JM3 Engineering Inh. J. Maisel Dobelweg 18, D-85567 Grafing / Munich
Email: [e-mail]
Version: 1.24 Nov 01, 2013 page: 3
5.3 I2C SlaveAddress
I2CTWI_transmit3Bytes(ADR_GPS_MODULE, 0x00, 0x04, addr);
// SW reset command according to I2C-bus specification and user manual Rev. 5
Slave Address is: 0xC8 (Standard) and can be changed in the range from 0xC8 to 0xDF.
After sending the command the module must be power cycled!
5.4 Writing commands to GPS Module
I2CTWI_transmit3Bytes(ADR_GPS_MODULE, cmd_Reg, cmd_Value);
// Write command to GPS Module
ADR_GPS_MODULE: slave address,
cmd_Reg: write register address
cmd_Value: command value
5.5 Reading data from I2C
Auto increment is supported.
I2CTWI_readRegisters(ADR_GPS_MODULE, 0x20, &buffer[0], n);
// read register from GPS Module
ADR_GPS_MODULE: slave address,
buffer: read register buffer
n: number of bytes to read
6. Technical Data
VDD = 5.0 V +/- 5%
IDD <= 20 mA (typ.)
Bus Speed: <= 400 kHz
GPS Antenna: build in
Backup battery: (automatic rechargeable, while on power)
Temperature Range: -10 to 65 °C
Form factor: 45 x 23 mm
Weight = approx.. 6 g
Receiver specification (UC530):
Receiver: GPS L1 C/A-code, SPS
Channels: 66/22 (search/track)
Tracking sensitivity: -165 dBm typ.
Navigation sensitivity: -148 dbm typ (cold aq.)
Update rate: 1 sec
Position accuracy: 3.0m (67%) typ Horizontal
5.0m (67%) typ Vertical
0.02 m/s (50%) typ. Velocity
First Time to Fix: typ. 31 sec (note 1)
Protocol: NMEA-0183 rev. 3.01
Note 1: With nominal GPS signal levels -130dBm.
Hint: After the module is the first time switched on or after a long time not being switched on, the
auto-positioning (location detection) can take up to 5 min.