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The BM7161-00-1 is the module of Holtek 2.4GHz BLE Beacon Transmitter IC BC7161. It communicates with external MCUs via the I2C interface.
The BC7161 is a low-cost 2.4GHz BLE Beacon transmitter. With an external 32MHz crystal (XO), an MCU, and a few ceramic capacitors, it can implement a complete Beacon device. The output power level can be programmed from -10dBm to +5dBm for various applications.