BCM89359 Advance 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 BCM89359 are:
•
•
•
RF Power Management
Host Controller Power Management
BBC 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 BCM89359 may be configured so that dedicated signals are used for power
management hand-shaking between the BCM89359 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
P5,
I
Bluetooth device wake-up: Signal from the host to the
BCM89359 indicating that the host requires attention.
253
•
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 N4,
241
O
O
Host wake up. Signal from the BCM89359 to the host
indicating that the BCM89359 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
N5,
233
The BCM89359 asserts CLK_REQ when Bluetooth or
WLAN wants the host to turn on the reference clock. The
CLK_REQ polarity is active-high.
Note: Pad function Control Register is set to 0 for these pins. See “DC Characteristics” on page 91 for more
details.
The timing for the startup sequence is defined in Figure 7.
Broadcom®
September 9, 2014 • 89359-DS100-R
Page 33
BROADCOM CONFIDENTIAL
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