STA2500D datasheet(29/57 Pages) STMICROELECTRONICS

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STA2500D

General specification

Doc ID 16067 Rev 1

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6.9

Interrupts

The user can program the BT_GPIOs as external interrupt sources.

6.10

Low power modes

6.10.1

Overview

To save power, three low power modes are supported as described in Table 24.

Depending of the Bluetooth and of the Host's activity, the STA2500D decides to use Sleep

mode or Deep Sleep mode. Note however that the Deep Sleep mode must first be activated

via SW parameter download or an HCI command prior to any possibility to use it as the

default configuration is only Sleep mode. Complete Power Down is entered only after an

explicit command from the Host.

Table 24.

Low power modes

Low power mode

Description

Sleep mode

The STA2500D:

– Accepts HCI commands from the Host.

– Supports all types of Bluetooth links.

– Can transfer data over Bluetooth links.

– Dynamically switches between sleep and active mode when needed.

– The system clock is still active in part of the design.

– Parts of the chip are dynamically powered off depending on the Bluetooth activity.

Deep Sleep mode

The STA2500D:

– Does not accept HCI commands from the Host.

– Supports Page and Inquiry scans.

– Supports Bluetooth links that are in Sniff or Sniff Subrating.

– Dynamically switches between Deep Sleep and active mode during Bluetooth

activity. The Deep Sleep mode entry is initiated by the Host, the STA2500D

acknowledges or not. The wake-up mechanism must be enabled by a SW

parameter download before it can be used. More details in section 6.10.3.

– The system clock is not active in any part of the design.

– Parts of the chip are dynamically powered off depending on the Bluetooth activity.

Complete Power Down

The STA2500D is effectively powered down:

– No Bluetooth activity is supported.

– The HCI interface is shut down.

– The system clock is not active in any part of the design.

– Most parts of the chip are completely powered off.

– RAM content is not maintained (initialisation is required at wake-up).

– Some pins (UART/SPI I/Os and the 4 clock request signals and BT_GPIO_16)

keep their previous configuration (input or output, pull behaviour) during

Completed Power Down.

– The Complete Power Down entry is initiated by an HCI command followed by a

Deep Sleep command, this in order to ensure a smooth transition from active to

Complete Power Down state. In order to go out of this mode, either a HW reset or

BT_WAKEUP = ‘1’ is needed.

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