STA2500D datasheet(32/57 Pages) STMICROELECTRONICS

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General specification

STA2500D

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Doc ID 16067 Rev 1

Figure 6.

Deep sleep mode entry and wake-up through H4 UART

Deep sleep mode entry and wake-up through enhanced H4 SPI

In this case no additional signals are needed to control the Deep Sleep mode and the wake-

up mechanism except for BT_CLK_REQ_OUT_x (BT_CLK_REQ_OUT_1 for active high

polarity and BT_ CLK_REQ_OUT_2 for active low polarity).

The enhanced H4 protocol makes use of three messages: SLEEP, WAKEUP and WOKEN.

More details on the enhanced H4 protocol can be found in Section 8.2.

●

Deep sleep mode entry

Entering Deep Sleep mode can only be initiated by the Host sending a SLEEP

message to the Bluetooth Controller.

If that one accepts it, the device enters Deep Sleep mode: consequently the Bluetooth

Controller de-asserts BT_CLK_REQ_OUT_x and internally gates the system clock.

This is illustrated in Figure 7.

If there is still pending activity at the Bluetooth side on the air, the Bluetooth Controller

does not immediately enter Deep Sleep mode and therefore BT_CLK_REQ_OUT_x

stays 'active' during this period: however the Bluetooth Controller will go in Deep Sleep

mode at the end of the air activity.

If there is pending data to be transferred to the Host, the Bluetooth Controller will

request a data transfer: however the Bluetooth Controller will go in Deep Sleep mode at

the end of the data transfer.

●

Deep sleep mode wake-up

Wake-up can be requested by the Host or autonomously by the Bluetooth Controller. In

the latter case, it can be with or without communication on the interface (i.e. during

Page scan, there is no data to transfer to the Host).

Wake-up initiated by the Host

In the case of a wake-up by the Host, it sends a WAKEUP command and waits for a

WOKEN response before starting the data exchange. Of course the Bluetooth

Controller must first request the system clock through BT_CLK_REQ_OUT_x.

It should be noted that the WAKEUP message is decoded in the Bluetooth Controller's

Active

Sleep Mode

Mode

UART off

UART o n

HOST_WAKEUP=‘ 1’ or ‘ 0’

‘A’ :

Active

high/low

‘ P’ :

Passive

low/high

Active

Sleep Mode

Host:

UART_ RXD=‘ 0’

BT Controller: UART_ RTS=‘1’

UART off

Host:

UART_ RXD=‘ 1’

BT Controller: UART_ RTS=‘0’

HOST_WAKEUP=‘1’

HOST_WAKEUP=‘ 0’

Host:

UART_ RXD=‘ 1’

AND

BT Controller: CLK_REQ_OUT_1=‘ A’

and

UART_ RTS=‘0’

Active

Sleep Mode

Deep Sleep UART off

UART o n

HOST_WAKEUP=‘ 1’ or ‘ 0’

BT_CLK_REQ_OUT_1 =

Active

Sleep Mode

Host:

BT_UA RT_RXD =‘ 0’

BT Controller: BT_UA RT_RTS=‘ 1’

UART off

Host:

BT_UA RT_RXD =‘ 1’

BT Controller:BT_UA RT_RTS =‘0’

BT_HOST_WAKEUP=‘1’

HOST_WAKEUP=‘ 0’

Host:

BT_UA RT_RXD=‘ 1’

AND

BT Controller: BT_CLK_ REQ_OUT_1 =‘ A’

and

BT_UA RT_RTS=‘ 0’

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