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STA2500D Arkusz danych(PDF) 33 Page - STMicroelectronics

Numer części STA2500D
Szczegółowy opis  Bluetooth??V2.1 EDR ("Lisbon") for automotive applications
PDF  57 Pages
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STA2500D Arkusz danych(HTML) 33 Page - 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.
2.
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.
3.
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
1
2
3
SPI_DI
SPI_DO
SPI_INT
4
SPI_CSN
SLEEP
REF_CLK _IN
CLK _REQ_OUT_1
SPI_CLK
1
2
3
SPI_DI
SPI_DO
SPI_INT
4
SPI_CSN
WAKEUP
5
WOKEN



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