BCM20705 datasheet(13/51 Pages) CYPRESS

13 / 51 page

Document Number: 002-14867 Rev. *F

Page 13 of 51

CYW20705

3.6.3 BBC Power Management

The device provides the following low-power operations for the BBC:

■ Physical layer packet handling turns RF on and off dynamically within packet TX and RX.

■ Bluetooth specified low-power connection mode (Sniff). While in this low-power connection mode, the device runs on the Low Power

Oscillator and wakes up after a predefined time period.

Table 2. 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 CYW20705A1KWFBG, the polarity of CLK_REQ is active low.

For CYW20705B0KWFBG, 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

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