User Manual

Bluetooth 4.0 BLE Module
1.3 Functional Description
The primary component on the module is the Broadcom BCM20737, which is a Bluetooth 4.0 compliant
basic rate single-chip. The baseband and radio have been integrated into a single chip implemented in
standard digital CMOS. The block diagram of the module is shown in Figure 1.
Figure 1: Block Diagram
The BB1737-25 employs an integrated ARM Cortex
TM
-M3 microprocessor core that runs software from
the Link Control layer up to the Host Controller Interface (HCI).The baseband portion of the BB1737-25
performs all the time-critical functions required for high-performance Bluetooth operations.
The radio incorporates the complete receive and transmit paths, including PLL, VCO, LNA, PA,
upconverter,downconverter, modulator, demodulator, and channel select filtering.
The module has a SPI interface. The interface has a 16-byte transmit buffer and a 16-byte receive
buffer .To support more flexibility for user applications. The module acts as an SPI master device that
supports 1.8V or 3.3V SPI slaves.