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Bluetooth Power Management Unit

BCM4354 Data Sheet

BROADCOM CONFIDENTIAL

Broadcom®

October 15, 2014 • 4354-DS109-R

Page 37

Bluetooth Power Management Unit

The Bluetooth Power Management Unit (PMU) provides power management features that can be invoked by

either software through power management registers or packet handling in the baseband core. The power

management functions provided by the BCM4354 are:

• RF Power Management

• Host Controller Power Management

• BBC Power Management

• FM Power Management

RF Power Management

The BBC generates power-down control signals for the transmit path, receive path, PLL, and power amplifier to

the 2.4 GHz transceiver. The transceiver then processes the power-down functions accordingly.

Host Controller Power Management

When running in UART mode, the BCM4354 may be configured so that dedicated signals are used for power

management hand-shaking between the BCM4354 and the host. The basic power saving functions supported

by those hand-shaking signals include the standard Bluetooth defined power savings modes and standby

modes of operation. Table 5 describes the power-control hand-shake signals used with the UART interface.

Table 5: Power Control Pin Description

Signal

Mapped to Pin

Type Description

BT_DEV_WAKE

BT_GPIO_0

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

BCM4354 indicating that the host requires attention.

• Asserted: The Bluetooth device must wake-up or remain

awake.

• Deasserted: The Bluetooth device may sleep when sleep

criteria are met.

The polarity of this signal is software configurable and can be

asserted high or low.

BT_HOST_WAKE BT_GPIO_1

Host wake up. Signal from the BCM4354 to the host

indicating that the BCM4354 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

BT_CLK_REQ_OUT

WL_CLK_REQ_OUT

The BCM4354 asserts CLK_REQ when Bluetooth or WLAN

wants the host to turn on the reference clock. The CLK_REQ

polarity is active-high. Add an external 100 kΩ pull-down

resistor to ensure the signal is deasserted when the

BCM4354 powers up or resets when VDDIO is present.

Note:

Pad function Control Register is set to 0 for these pins. See “DC Characteristics” on page 125 for more

details.

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