BCM20705 Datasheet, PDF (21/67 Pages) Cypress Semiconductor – Single-Chip Bluetooth Transceiver and Baseband Processor

BCM20705 Data Sheet
Power Management Unit
Note: Successful operation of the power management handshaking signals requires coordinated
support between the device firmware and the host software.
Pin
BT_WAKE
(GPIO_0)
Direction
Host output
BT input
HOST_WAKE BT output
(GPIO_1)
Host input
CLK_REQ
(GPIO_5)
BT output
REG_EN
BT input
Table 1: Power Control Pin Summary
Description
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-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.
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.
Enables the internal preregulator and main regulator outputs. REG_EN is
active-high.
• 1 = Enabled
• 0 = Disabled
Broadcom®
Bluetooth Transceiver and Baseband Processor
November 13, 2014 • MCS20705-DS104-R
Page 20
BROADCOM CONFIDENTIAL