CSR is the abbreviation of the name of a British chip manufacturer. The CSR on the blue adapter indicates that the adapter uses the chip of CSR manufacturer, which is also the name of a manufacturer code.

Bluetooth module is a PCBA board integrated with Bluetooth function, which is used for short-distance wireless communication. According to the function, it is divided into Bluetooth data module (such as BLK-MD-BC04-B and BLK-MD-SPP series) and Bluetooth voice module (such as BLK-MD-SPK series).

Bluetooth module is generally composed of chip, PCB board and peripheral equipment. For example, BLK-MD-BC04-B Bluetooth module has CSRBC4 Bluetooth chip, MX flash memory is soldered on 4-layer PCB, and PCB integrates 2.4G printed board antenna, which is cost-effective. And some modules will have RF power amplifiers, such as BLK-MD-BC04-L long-distance Bluetooth module.

Extended data:

Classification of Bluetooth modules:

1. Bluetooth module is divided into Broadcom Bluetooth module, Dell Bluetooth module and CSR Bluetooth module according to chip manufacturers.

2. Bluetooth modules are divided into data Bluetooth module, serial Bluetooth module, voice Bluetooth module and vehicle Bluetooth module according to their uses;

3. Bluetooth module is divided into CLASS 1, CLASS2 and Class 3； according to power;

4. Bluetooth modules are mainly divided into classic Bluetooth module (BT) and low-power Bluetooth module (BLE) according to the application and supported protocols;

5. Bluetooth module is divided into single-mode Bluetooth module and dual-mode Bluetooth module according to the supported protocols.

Baidu Encyclopedia-Bluetooth Module