CYW20713 Datasheet, PDF (12/52 Pages) Cypress Semiconductor – Bluetooth 4.0 + EDR compliant

PRELIMINARY
CYW20713
There are two mechanisms for the device and the host to signal wake status to each other:
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 CYW20713 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 CYW20713 enters
sleep, the host can wake it by asserting SPI_CSN. If the host decides to sleep, the CYW20713 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
Table 2. Power Control Pin Summary
Pin
BT_WAKE
(GPIO_0)
HOST_WAKE
(GPIO_1)
CLK_REQ
(GPIO_5)
REG_EN
Direction
Host output
BT input
BT output
Host input
BT output
BT input
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
3.6.3 Bluetooth Baseband Core Power Management
The device provides the following low-power operations for the Bluetooth Baseband Core (BBC):
■ Physical layer packet handling turns RF on and off dynamically within packet TX and RX.
■ Bluetooth specified low-power connection modes—Sniff, Hold, and Park. While in these low-power connection modes, the device
runs on the Low Power Oscillator and wakes up after a predefined time period.
Document Number: 002-14806 Rev. *C
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