The CoolKit GSA-D04 is a compact 4‑channel GSM/GPRS switch controller module with four‑band support, low power consumption, and detailed hardware…
The GSA-D04 module is a four‑channel GSM/GPRS switch controller designed by CoolKit. It operates on four GSM frequency bands (GSM850, EGSM900, DCS1800, PCS1900) and supports GPRS multi‑slot class 10 with various CS coding formats. The module measures 23 mm × 23 mm × 2.7 mm and provides 48 surface‑mount pads for hardware interfacing.
The datasheet details the module's electrical characteristics, including a supply voltage range of 3.4 V – 4.5 V, operating temperature from –40 °C to +80 °C, and peak current up to 2 A. Pin functions, UART interfaces, antenna recommendations, and PCB layout guidelines are also provided. This manual is written in Chinese.
| Frequency Bands | GSM850, EGSM900, DCS1800, PCS1900 |
|---|---|
| Power Class | Class 4 (2 W) for GSM850/EGSM900, Class 1 (1 W) for DCS1800/PCS1900 |
| Dimensions | 23 mm × 23 mm × 2.7 mm |
| Supply Voltage | 3.4 V – 4.5 V (recommended 3.8 V) |
| Operating Temperature | Normal: –40 °C to +80 °C |
| Peak Current | Up to 2 A |
| GPRS Downlink Speed | Maximum 85.6 kbps |
| GPRS Uplink Speed | Maximum 42.8 kbps |
| UART Baud Rate | 9600 bps – 115200 bps |
| Pin Count | 48 surface‑mount pads |
It supports four GSM bands: GSM850, EGSM900, DCS1800, and PCS1900.
The normal operating temperature range is –40 °C to +80 °C.
It requires a supply voltage between 3.4 V and 4.5 V, with a recommended 3.8 V.
The module provides 48 surface‑mount pads for connections.