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Power Management Unit

BCM20705 Data Sheet

BROADCOM CONFIDENTIAL

Broadcom®

Bluetooth Transceiver and Baseband Processor

November 13, 2014 • MCS20705-DS104-R

Page 20

Note:

Successful operation of the power management handshaking signals requires coordinated

support between the device firmware and the host software.

Table 1: Power Control Pin Summary

Direction

Description

BT_WAKE

(GPIO_0)

Host output

BT input

Bluetooth device wake-up: Signal from the host to the Bluetooth device that the

host requires attention.

• Asserted = Bluetooth device must wake up or remain awake.

• Deasserted = Bluetooth device may sleep when sleep criteria are met.

The polarity of this signal is software configurable and can be asserted high or

low. By default, BT_WAKE is active-low (if BT-WAKE is low it requires the

device to wake up or remain awake).

For USB applications, this can be used for setting Airport mode (radio disable

mode).

HOST_WAKE

(GPIO_1)

BT output

Host input

Host wake-up. Signal from the Bluetooth device to the host indicating that

Bluetooth device requires attention.

• Asserted = Host device must wake up or remain awake.

• Deasserted = Host device may sleep when sleep criteria are met.

The polarity of this signal is software configurable and can be asserted high or

low.

CLK_REQ

(GPIO_5)

BT output

Clock request

• Asserted = External clock reference required

• Deasserted = External clock reference may be powered down

For the BCM20705A1KWFBG, the polarity of CLK_REQ is active low.

For BCM20705B0KWFBG, the CLK_REQ function is only available as a

configurable feature after firmware boot, which means it cannot be used to

request a clock at boot time.

REG_EN

BT input

Enables the internal preregulator and main regulator outputs. REG_EN is

active-high.

• 1 = Enabled

• 0 = Disabled

BCM20705 Datasheet(PDF) 21 Page - Cypress Semiconductor

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