STLC2500ATR datasheet(23/37 Pages) STMICROELECTRONICS

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STLC2500A

General specification

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The following sections describe examples for the usage of the low power modes.

6.7.1

SNIFF or PARK

The STLC2500A is in active mode with a Bluetooth connection. Once the transmission is

concluded, SNIFF or PARK is programmed. When one of these two states is entered, the

STLC2500A goes into Sleep Mode. After that, the Host may decide to place the

STLC2500A in Deep Sleep Mode as described in

Section 6.8. The Deep Sleep Mode allows

for lower power consumption. When the STLC2500A needs to send or receive a packet (e.g.

at TSNIFF or at the beacon instant), it requires the system clock and enters active mode for

the needed transmission/reception. Immediately afterwards, it will go back to Deep Sleep

Mode. If some HCI transmission is needed, the UART link will be reactivated, using one of

the two ways explained in

Section 6.8, and the STLC2500A will move from Deep Sleep

Mode to Sleep Mode.

6.7.2

Inquiry/Page scan

When only inquiry scan or page scan is enabled, the STLC2500A will go in Sleep Mode or

Deep Sleep Mode outside the receiver activity. The selection between Sleep Mode and

Deep Sleep Mode depends on the UART activity like in SNIFF or PARK.

6.7.3

No connection

If the Host allows Deep Sleep Mode (as described in section 7.8) and there is no activity,

then the STLC2500A is placed in Deep Sleep Mode. In this mode (no connection), the Host

can also decide to put the STLC2500A in Complete Power Down to further reduce the

power consumption. In this case some part of the STLC2500A will be completely powered

off. It's possible to exit the Deep Sleep Mode by using one of the two methods explained in

Section 6.8. The request to quit the Complete Power Down is done either by using the same

methods as to exit Deep Sleep Mode, either with an HW reset, e.g. triggered by the Host.

Deep sleep mode

The STLC2500A:

– Does not accept HCI commands from the Host.

– Supports page- and inquiry scans.

– Supports Bluetooth links that are in Sniff, Hold or Park.

– Does not transfer data over Bluetooth links.

– Dynamically switches between deep sleep and active mode during

Bluetooth activity.

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

– Parts of the chip can be dynamically powered off depending on the

Bluetooth activity.

Complete power down

The STLC2500A 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 wakeup).

Table 17.

Low power modes

Description

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