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Adaptive Frequency Hopping

BCM20705 Data Sheet

BROADCOM CONFIDENTIAL

Broadcom®

Bluetooth Transceiver and Baseband Processor

November 13, 2014 • MCS20705-DS104-R

Page 22

Adaptive Frequency Hopping

The BCM20705 supports host channel classification and dynamic channel classification Adaptive Frequency

Hopping (AFH) schemes, as defined in the Bluetooth specification.

Host channel classification enables the host to set a predefined hopping map for the device to follow.

If dynamic channel classification is enabled, the device gathers link quality statistics on a channel-by-channel

basis to facilitate channel assessment and channel map selection. To provide a more accurate frequency hop

map, link quality is determined using both RF and baseband signal processing.

Collaborative Coexistence

The BCM20705 provides extensions and collaborative coexistence to the standard Bluetooth AFH for direct

communication with WLAN devices. Collaborative coexistence enables WLAN and Bluetooth to operate

simultaneously in a single device. The device supports industry-standard coexistence signaling, including

802.15.2, and supports Broadcom and third-party WLAN solutions.

Using a multitiered prioritization approach, relative priorities between data types and applications can be set.

This approach maximizes the performance-WLAN data throughput vs. voice quality vs. link performance.

A PA shutdown pin is available to allow full external control of the RF output for other types of coexistence, such

as WIMAX.

Serial Enhanced Coexistence Interface

The Serial Enhanced Coexistence Interface (Serial ECI or SECI) is a proprietary Broadcom interface between

Broadcom WLAN devices and Bluetooth devices. It is an optional replacement to the legacy 3- or 4-wire

coexistence feature, which is also available.

The following key features are associated with the interface:

• Enhanced coexistence data can be exchanged over a two-wire interface, one serial input (SECI_IN), and

one serial output (SECI_OUT). The pad configuration registers must be programmed to choose the digital I/

O pins that serve the SECI_IN and SECI_OUT function.

• It supports generic UART communication between WLAN and Bluetooth devices.

• To conserve power, it is disabled when inactive.

• It supports automatic resynchronizaton upon waking from sleep mode.

• It supports a baud rate of up to 4 Mbps.

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