STLC2500A datasheet(26/37 Pages) STMICROELECTRONICS

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General specification

STLC2500A

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i.e. GPIO3 is low) it sets HOST_WAKEUP to '0', telling the Host that the system

clock is not needed any more.

Note:

Note that in this case, the UART will be closed (as described above).

–

An autonomous wakeup (i.e. initiated by the Bluetooth Controller) goes as follows:

the Bluetooth Controller sets the HOST_WAKEUP signal to '1' to request the

system clock. Initially, GPIO3 is unaffected. GPIO3 will only be asserted when and

if there are data or HCI events to be sent. In that case the UART will be opened

(and UART_RTS will be asserted).

–

Wakeup initiated by the Host:

the Hosts sets BT_WAKEUP to '1'. The Bluetooth Controller then asserts the

HOST_WAKEUP signal to request the system clock. The Bluetooth Controller will

also open the UART (and assert UART_RTS). Initially, GPIO3 is unaffected.

GPIO3 will only be asserted when and if there are data or HCI events to be sent.

Figure 6.

Low power modes [Initiated deep sleep, mode 2]

6.9

Patch RAM

The STLC2500A includes a HW block that allows patching of the ROM code.

Additionally, a SW patch mechanism allows replacing complete SW functions without

changing the ROM image.

A part of the RAM memory is used for HW and SW patches.

6.10

Download of SW parameters

To change the device configuration a set of customizable parameters have been defined

and put together in one file. This file is downloaded at start-up into the STLC2500A.

Active

Sleep Mode

Deep Sleep

Mode

Complete Power Down

Host: BT_WAKEUP=‘1’

Hard Reset

UART off

UART on

Host: sends a specific HCI command.

UART off

Host: BT_WAKEUP=‘0’

AND

BT Controller: HOST_WAKEUP=‘0’

and GPIO3=‘0’

Host: BT_WAKEUP=‘1’

BT Controller: HOST_WAKEUP=‘1’

and

GPIO3=‘1’

GPIO3=‘0’

GPIO3=‘1’

GPIO3=‘0’

Active

Sleep Mode

Deep Sleep

Mode

Complete Power Down

Host: BT_WAKEUP=‘1’

Hard Reset

UART off

UART on

Host: sends a specific HCI command.

UART off

Host: BT_WAKEUP=‘0’

AND

BT Controller: HOST_WAKEUP=‘0’

and GPIO3=‘0’

Host: BT_WAKEUP=‘1’

BT Controller: HOST_WAKEUP=‘1’

and

GPIO3=‘1’

GPIO3=‘0’

GPIO3=‘1’

GPIO3=‘0’

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