BCM43455 Preliminary Data Sheet
Bluetooth Power Management Unit
Note: Pad function Control Register is set to 0 for these pins. See “DC Characteristics” on page 97 for
more details.
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
BCM43455 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 BCM43455 to the host
indicating that the BCM43455 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.
BT_CLK_REQ
BT_CLK_REQ_OUT
WL_CLK_REQ_OUT
O
The BCM43455 asserts BT_CLK_REQ when Bluetooth
or WLAN wants the host to turn on the reference clock.
The BT_CLK_REQ polarity is active-high. Add an
external 100 kΩ pull-down resistor to ensure the signal
is deasserted when the BCM43455 powers up or resets
when VDDIO is present.
Broadcom®
November 5, 2015 • 43455-DS109-R
Page 41
BROADCOM CONFIDENTIAL
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