STLC2500A View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'STLC2500A' PDF : 37 Pages View PDF
STLC2500A
General specification
6.7.1
6.7.2
6.7.3
Table 17. Low power modes
Low power modes
Description
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).
The following sections describe examples for the usage of the low power modes.
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.
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.
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.
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