This document describes the features and characteristics of the LR9805-ST GPS module.
The Leadtek LR9805ST GPS module is a high‑sensitivity, low‑power surface‑mount device designed for a wide range of OEM applications, including handheld devices, automotive and marine navigation, and asset‑tracking systems. It incorporates the SiRFstarII single‑chip GPS receiver and offers a compact 24 × 20 × 2.9 mm footprint.
The manual provides detailed information on hardware and software features, performance metrics such as cold‑start time and power consumption, interface specifications (TTL serial, NMEA‑0183/SiRF binary), environmental limits, mechanical dimensions, and recommended manufacturing guidelines. It also includes reference designs, block diagrams, and pin‑out drawings to aid integration.
| Chipset | GSC2x Series SiRFstarII |
|---|---|
| Frequency | L1 1575.42 MHz |
| Number of Channels | 12 |
| Power Consumption (continuous mode) | ≈106 mW |
| Supply Voltage | 3.3 ± 0.3 VDC |
| Operating Temperature Range | -40 °C to +85 °C |
| Weight | 2.5 g |
| Interface | TTL level serial port (28‑pin SMD) |
| Supported Baud Rates | 4800, 9600, 19200, 38400, 57600 bps |
The module consumes approximately 106 mW in continuous mode.
It operates from –40 °C up to +85 °C.
It supports NMEA‑0183 (default 4800 bps) and SiRF binary protocols.