STA2500D datasheet(33/57 Pages) STMICROELECTRONICS

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STA2500D

General specification

Doc ID 16067 Rev 1

33/57

SPI HW block even before the system clock is available. This block will generate an

interrupt, allowing the Bluetooth Controller to reply with a WOKEN message. This is

illustrated in Figure 8.

Autonomous wake-up with communication (i.e. initiated by the STA2500D)

In the case of an autonomous wake-up with data transmission, the Bluetooth Controller

sets BT_SPI_INT high to request the SPI interface and waits for BT_SPI_CSN going

low, indicating the SPI transaction starts. Of course the Bluetooth Controller must first

request the system clock through BT_CLK_REQ_OUT_x before being able to start the

process. This is illustrated in Figure 9. Note that the Bluetooth Controller goes back to

Deep Sleep mode at the end of the data transfer.

Autonomous wake-up without communication (i.e. initiated by the STA2500D)

For autonomous wake-up without SPI communication, the STA2500D only asserts

BT_CLK_REQ_OUT_x to get the system clock.

Figure 7.

Entering deep sleep mode through enhanced H4 SPI

Figure 8.

Wake-up by the host through enhanced H4 SPI

REF_CLK _IN

CLK _REQ_OUT_1

SPI_CLK

SPI_DI

SPI_DO

SPI_INT

SPI_CSN

SLEEP

REF_CLK _IN

CLK _REQ_OUT_1

SPI_CLK

SPI_DI

SPI_DO

SPI_INT

SPI_CSN

WAKEUP

WOKEN

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