BCM4339 Preliminary Data Sheet
Bluetooth Power Management Unit
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 BCM4339 are:
•
•
•
•
RF Power Management
Host Controller Power Management
“BBC Power Management” on page 43
“FM Power Management” on page 43
RF Power Management
The BBC generates power-down control signals to the 2.4 GHz transceiver for the transmit path, receive path,
PLL, and power amplifier. The transceiver then processes the power-down functions accordingly.
Host Controller Power Management
When running in UART mode, the BCM4339 may be configured so that dedicated signals are used for power
management handshaking between the BCM4339 and the host. The basic power saving functions supported
by those handshaking signals include the standard Bluetooth defined power savings modes and standby modes
of operation.
Table 4 describes the power-control handshake signals used with the UART interface.
Table 4: Power Control Pin Description
Signal
Mapped to Pin
Type Description
BT_DEV_WAKE BT_GPIO_0
I
Bluetooth device wake-up: Signal from the host to the
BCM4339 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_WAK BT_GPIO_1
E
O
Host wake up. Signal from the BCM4339 to the host
indicating that the BCM4339 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.
Broadcom®
November 17, 2014 • 4339-DS106-R
Page 41
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