STLC2411 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'STLC2411' PDF : 25 Pages View PDF
STLC2411
7.8 V1.2 detailed functionality - Faster Connection
User Perspective - Faster Connection
This feature gives the User about 65% faster connection on average when enabled compared to Bluetooth
spec 1.1 connection procedure.
Technical perspective - Faster Connection
The faster Inquiry functionality is based on a removed/shortened random back off and also a new Inter-
laced Inquiry scan scheme.
The faster Page functionality is based on Interlaced Page Scan.
7.9 V1.2 detailed functionality - Quality of Service
User Perspective - Quality of Service
Small changes to the BT1.1 spec regarding Quality of Service makes a large difference by allowing all
QoS parameters to be communicated over HCI to the link manager that enables efficient BW manage-
ment. Here after a short list of user perspectives:
1) Flush timeout: enables time-bounded traffic such as video streaming to become more robust when the
channel degrades. It sets the maximum delay of an L2CAP frame. It does not enable multiple streams
in one piconet, or heavy data transfer at the same time.
2) Simple latency control: allows the host to set the poll interval. Provides enough support for HID devic-
es mixed with other traffic in the piconet.
7.10 Low power modes
To save power, two low power modes are supported. Depending of the Bluetooth and of the Host's activ-
ity, the STLC2411 autonomously decides to use Sleep Mode or Deep Sleep Mode.
Table 10. Low power modes
Low power mode
Sleep Mode
Deep Sleep Mode
Description
The STLC2411:
- Accepts HCI commands from the Host.
- Supports page- and inquiry scans.
- Supports Bluetooth links that are in Sniff, Hold or Park.
- Can transfer data over Bluetooth links.
- The system clock is still active in part of the design.
The STLC2411:
- Does not accept HCI commands from the Host.
- Keeps track of page- and inquiry scan activities.
Switches between sleep and active mode when it is time to scan.
- Supports Bluetooth links that are in Sniff, Hold or Park.
- Does not transfer data over Bluetooth links.
- The system clock is not active in any part of the design.
Note: Deep Sleep mode is not compatible with a USB transport layer.
Some examples of the low power modes usage:
7.10.1 SNIFF OR PARK
The STLC2411 is in active mode with a Bluetooth connection, once the connection is concluded the SNIFF
or the PARK is programmed. Once one of these two states is entered the STLC2411 goes in Sleep Mode.
After that, the Host may decide to place the STLC2411 in Deep Sleep Mode by putting the UART LINK in
low power mode. The Deep Sleep Mode allows smaller power consumption. When the STLC2411 needs
to send or receive a packet (e.g. at TSNIFF or at the beacon instant) it will require the clock and it will go in
active mode for the needed transmission/reception. Immediately afterwards it will go back to the Deep
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