BCM20713A1KUBXGT Datasheet, PDF (20/65 Pages) Cypress Semiconductor – Single-Chip Bluetooth Transceiver and Baseband Processor

BCM20713 Preliminary Data Sheet
Power Management Unit
Bluetooth WAKE (BT_WAKE) and
Host WAKE (and HOST_WAKE)
signaling
In-band UART signaling
The BT_WAKE pin (GPIO_0) allows the host to wake the BT device,
and HOST_WAKE (GPIO_1) is an output that allows the BT device
to wake the host.
The CTS and RTS signals of the UART interface are used for BT
wake (CTS) and Host wake (RTS) functions in addition to their
normal function on the UART interface. Note that this applies for
both H4 and H5 protocols.
When running in SPI mode, the BCM20713 has a mode where it enters Sleep mode when there is no activity
on the SPI interface for a specified (programmable) amount of time. Idle mode is detected when the SPI_CSN
is left deasserted. Whether to sleep on an idle interface and the amount of time to wait before entering Sleep
mode can be programed by the host. Once the BCM20713 enters sleep, the host can wake it by asserting
SPI_CSN. If the host decides to sleep, the BCM20713 will wake up the host by asserting SPI_INT when it has
data for it.
Note: Successful operation of the power management handshaking signals requires coordinated
support between the device firmware and the host software.
Pin
BT_WAKE
(GPIO_0)
Direction
Host output
BT input
HOST_WAKE BT output
(GPIO_1)
Host input
CLK_REQ
(GPIO_5)
BT output
REG_EN
BT input
Table 1: Power Control Pin Summary
Description
Bluetooth device wake-up: Signal from the host to the Bluetooth device that the
host requires attention.
• Asserted = Bluetooth device must wake up or remain awake.
• Deasserted = Bluetooth device may sleep when sleep criteria are met.
The polarity of this signal is software configurable and can be asserted high or
low. By default, BT_WAKE is active-low (if BT-WAKE is low it requires the
device to wake up or remain awake).
Host wake-up. Signal from the Bluetooth device to the host indicating that
Bluetooth device 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.
Clock request
• Asserted = External clock reference required
• Deasserted = External clock reference may be powered down
The polarity of CLK_REQ is software configurable and can be set to active high
(TM0 = 1) or active low (TM0 = 0).
Enables the internal preregulator and main regulator outputs. REG_EN is
active-high.
• 1 = Enabled
• 0 = Disabled
Broadcom^®
December 21, 2015 • 20713-DS102-R
Single-Chip Bluetooth Transceiver and Baseband Processor
Page 19
BROADCOM CONFIDENTIAL