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STLC2416

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 STLC2416 will move from the Deep Sleep Mode to the Sleep Mode.

7.10.2 INQUIRY/PAGE SCAN

When only inquiry scan or page scan is enabled, the STLC2416 will go in Sleep Mode or Deep Sleep

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

the UART activity like in SNIFF or PARK.

7.10.3 NO CONNECTION

If the Host places the UART in low power and there is no activity, then the STLC2416 can be placed in

Deep Sleep Mode.

7.10.4 ACTIVE LINK

When there is an active link (SCO or ACL), the STLC2416 cannot go in Deep Sleep Mode whatever the

UART state is. But the STLC2416 baseband is made such that whenever it is possible, depending on the

scheduled activity (number of link, type of link, amount of data exchanged), it goes in Sleep Mode.

7.11 SW initiated low power mode

A wide set of wake up mechanisms are supported.

7.12 Bluetooth - WLAN coexistence in collocated scenario

The coexistence interface uses 4 GPIO pins, when enabled.

Bluetooth and WLAN 802.11 b/g technologies occupy the same 2.4 GHz ISM band. STLC2416 imple-

ments a set of mechanisms to avoid interference in a collocated scenario.

The STLC2416 supports 5 different algorithms in order to provide efficient and flexible simultaneous func-

tionality between the two technologies in collocated scenarios:

– Algorithm 1: PTA (Packet Traffic Arbitration) based coexistence algorithm defined in accordance with

the IEEE 802.15.2 recommended practice.

– Algorithm 2: the WLAN is the master and it indicates to the STLC2416 when not to operate in case of

simultaneous use of the air interface.

– Algorithm 3: the STLC2416 is the master and it indicates to the WLAN chip when not to operate in case

of simultaneous use of the air interface.

– Algorithm 4: Two-wire mechanism

– Algorithm 5: Alternating Wireless Medium Access (AWMA), defined in accordance with the WLAN

802.11 b/g technologies.

The algorithm is selected via HCI command. The default algorithm is algorithm 1.

7.12.1 Algorithm 1: PTA (Packet Traffic Arbitration)

The Algorithm is based on a bus connection between the STLC2416 and the WLAN chip :

By using this coexistence interface it's possible to dynamically allocate bandwidth to the two devices when

simultaneous operations are required while the full bandwidth can be allocated to one of them in case the

other one does not require activity. The algorithm involves a priority mechanism, which allows preserving

the quality of certain types of link. A typical application would be to guarantee optimal quality to the Blue-

STLC2416

WLAN