This is the user manual for GPS ENGINE BOARD ET-333, produced by GlobalSat Technology Corporation. It introduces the features of the product, including a high-performance GPS chip set, extremely high sensitivity, very small size, support for NMEA 0183 and SiRF binary protocol, etc.
The GlobalSat ET-333 GPS Engine Board is a compact, high‑performance GPS module based on the SiRFstar chipset. It supports both NMEA 0183 and SiRF binary protocols, offers fast time‑to‑first‑fix, and includes a backup super‑capacitor for rapid satellite acquisition.
The manual provides detailed hardware specifications, pin‑out descriptions, power requirements, environmental limits, and a full list of software commands for configuring NMEA output, datum selection, and navigation initialization.
| Chipset | SiRFstar |
|---|---|
| Frequency | L1 1575.42 MHz |
| Channels | 20 |
| Sensitivity | -159 dBm |
| Position Accuracy | 10 m (2D RMS 5 m) |
| Velocity Accuracy | 0.1 m/s |
| Power Input Voltage | 3.8 V – 6.5 V DC |
| Power Consumption (continuous) | 70 mA |
| Backup Battery Voltage | 2.5 V – 3.6 V |
| Physical Size | 40.5 mm × 35 mm × 10 mm |
| Maximum Altitude | 18 000 m (60 000 ft) |
| Maximum Velocity | 515 m/s (1000 knots) |
The board operates from a main DC supply of 3.8 V to 6.5 V.
It can track up to 20 channels in an all‑in‑view mode.
The receiver has a tracking sensitivity of –159 dBm.
Both NMEA 0183 and SiRF binary protocols are supported.