STA2416 datasheet(24/38 Pages) STMICROELECTRONICS

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General specification

STA2416

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6.9

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 management. Below is a short list of user perspectives.

●

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.

●

Simple latency control: allows the host to set the poll interval. Provides enough

support for HID devices mixed with other traffic in the piconet.

6.10

Low power modes

To save power, two low power modes are supported. Depending on the Bluetooth™ and the

Host’s activity, the STA2416 autonomously decides to use Sleep Mode or Deep Sleep

Mode.

6.10.1

Sniff or park

The STA2416 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 STA2416 goes in Sleep Mode. After that, the Host may decide to place the STA2416 in

Deep Sleep Mode by putting the UART LINK in low power mode. The Deep Sleep Mode

allows smaller power consumption. When the STA2416 needs to send or receive a packet

(for example, 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 Sleep Mode. If some HCI transmission is needed, the UART link will be reactivated,

using one of the two ways explained in 7.5, and the STA2416 will move from the Deep Sleep

Mode to the Sleep Mode.

Table 9.

Low power modes

Low power mode

Description

Sleep Mode

The STA2416:

– 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

Deep Sleep Mode(1)

Deep Sleep mode is not compatible with a USB transport layer

The STA2416:

– 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

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