BCM43353LIUBGT Datasheet, PDF (40/143 Pages) Cypress Semiconductor – Single-Chip 5G WiFi IEEE 802.11ac MAC/Baseband/Radio with Integrated Bluetooth 4.1 for Automotive and Industrial Applications

BCM43353 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 BCM43353 are:
• RF Power Management
• Host Controller Power Management
• “BBC Power Management” on page 40
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 BCM43353 may be configured so that dedicated signals are used for power
management handshaking between the BCM43353 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
BT_DEV_WAKE BT_GPIO_0
BT_HOST_WAK BT_GPIO_1
E
CLK_REQ
BT_CLK_REQ_OUT
WL_CLK_REQ_OUT
Type Description
I
Bluetooth device wake-up: Signal from the host to the
BCM43353 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.
O Host wake up. Signal from the BCM43353 to the host
indicating that the BCM43353 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.
O The BCM43353 asserts CLK_REQ when either the
Bluetooth or WLAN block 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 BCM43353 powers up or resets when
VDDIO is present.
Broadcom^®
November 14, 2014 • 43353-DS104-R
Page 39