SC14CVMDECT datasheet(21/57 Pages) DIALOG

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Datasheet

Revision 3.0

28-Jul-2015

CFR0011-120-00-FM Rev 5

21 of 57

SC14CVMDECT SF

Cordless Voice Module

FINAL

4.10.2 Out-of-Range handling

When the PP goes in-range or out-of-range a signal is

sent from the PP to the MMI software indicating

whether the PP is in-lock or is out-of-lock with the FP.

4.10.3 Preamble antenna diversity

To optimise the audio quality caused by rapidly chang-

ing radio paths (fading), the SC14CVMDECT SF sup-

ports preamble antenna diversity. The preamble

diversity algorithm uses RSSI measurements to judge

the radio signal strength on both antennas and, as a

result, the choice of the best performing antenna is

determined. This antenna will then be used for the

receive slot and the next transmit slot.

The preamble antenna diversity is supported with two

antennas. The preamble diversity can be controlled by

VES. See document reference [4] and section 4.13 for

more information about antenna diversity.

4.10.4 Broadcasting messages

Messages consisting of up to 19 bytes can be broad-

casted from FP to all registered PPs. Broadcasting

does not require an active connection. Broadcasting

does not use retransmission, therefore broadcasting is

not secured. If the real time clock is enabled this data is

also broadcasted to all PPs.

4.10.5 IWU to IWU messaging

The protocol in the SC14CVMDECT SF module is

made according to the DECT/GAP standard as defined

in EN 300 175 and EN 300 444.

The DECT standard defines an EMC code (see

EN 300 175-5, chapter 7.7.23.). This code is unique for

a DECT product and must be programmed by the

DECT manufacturer to the correct manufacturer code.

The EMC code must be the same for SC14CVMDECT

SF based product families when using the IWU to IWU

messaging.

If the Dialog default EMC VES value is changed the

IWU to IWU messaging may not operate correctly.

IWU data is transferred in a FA format frame; see chap-

ter 6.1 in EN 300 175-4. This frame has an information

field of maximum 63 bytes of which maximum 52 bytes

can be used for IWU data. With the SC14CVMDECT

SF it is only possible to send 5 frames in a row without

pause. The following frame must be an acknowledge-

frame to secure that the internal buffers within the

SC14CVMDECT SF are emptied.

The FA frame is segmented in 5 byte fragments and

transferred over the air-interface in the A-field. The 2-

bytes CRC is used to determine if the data is received

correctly. If the data is not received correctly this is sig-

nalled back to the transmitter by the Q2 bit, and the

data is retransmitted.

The FA frame has a 2 bytes checksum, used to deter-

mine if the complete packet is received correctly. If A

checksum error is signalled back to the transmitter and

the complete packet is retransmitted. The packet will

be retransmitted until it is received correctly, or until the

link is closed.

More transmitted packets will be received in the same

order as they were transmitted. The application must

handle flow control, if needed.

4.11 REGISTRATION

The PP and the FP must be paired using a procedure

called Registration. Without Registration, the PP will be

out-of-lock and will not be able to establish a link to an

FP and therefore not be able to make a call. The regis-

tration uses the unique product identities and secures

the PP and FP to allow no cross-communication.

The PP can be de-registered from an FP either via the

FP or PP MMI Software using the command interface.

It is also possible to deregister a PP from another reg-

istered PP.

It is possible to pair a PP and FP during the production.

SC14CVMDECT Datasheet(PDF) 21 Page - Dialog Semiconductor

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