STA2500DTR STMICROELECTRONICS [STMicroelectronics], STA2500DTR Datasheet - Page 33

• Manufacturer Part Number: STA2500DTR
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

STA2500D
2.
3.
Figure 7.
Figure 8.
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
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
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.
SPI_CSN
SPI_CLK
SPI_INT
REF_CLK _IN
CLK _REQ_OUT_1
SPI_DO
SPI_DI
Entering deep sleep mode through enhanced H4 SPI
Wake-up by the host through enhanced H4 SPI
SPI_CSN
SPI_CLK
SPI_INT
REF_CLK _IN
CLK _REQ_OUT_1
SPI_DO
SPI_DI
Figure
2
1
8.
Doc ID 16067 Rev 1
WAKEUP
Figure
3
2
1
4
9. Note that the Bluetooth Controller goes back to
SLEEP
3
5
WOKEN
General specification
4
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