BCM4356XKUBGT Datasheet, PDF (39/195 Pages) Cypress Semiconductor – Single-Chip 5G WiFi IEEE 802.11ac 2×2 MAC/ Baseband/Radio with Integrated Bluetooth 4.1, FM Receiver, and Wireless Charging

BCM4356 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 BCM4356 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 BCM4356 may be configured so that dedicated signals are used for power
management hand-shaking between the BCM4356 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 I
Bluetooth device wake-up: Signal from the host to the BCM4356
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 O
Host wake up. Signal from the BCM4356 to the host indicating that
the BCM4356 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 O
_OUT
WL_CLK_REQ
_OUT
The BCM4356 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 BCM4356 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 126 for more
details.
Broadcom^®
May 8, 2015 • 4356-DS103-R
BROADCOM CONFIDENTIAL
Page 38