mt9094apr1 Zarlink Semiconductor, mt9094apr1 Datasheet - Page 28

• Manufacturer Part Number: mt9094apr1
• Description: Fully Featured Digital Telephone Circuit With Embedded Dsp For Tone Generation And Hands Free Operation
• Manufacturer: Zarlink Semiconductor

Generate DTMF tones
Description
select B-Channel of operation
reset DSP
set Rx DTMF gain (ie -20 dBm0)
set Tx audio gain (ie 0dB)
set Tx DTMF gain (ie -4dBm0)
write tone coefficient 1
write tone coefficient 2
start DTMF program
select transducers and filter/CODEC
(PuFC)
and turn off sidetone
optional:
set CODEC Rx gain
send tones in only Rx or Tx by
disabling
RxMUTE or TxMUTE appropriately
New Call Tone
Description
Assume that a B-Channel of operation has already been selected for the concurrent handset
conversation.
If this is not true select one.
select B-Channel of operation
reset DSP
set Rx gain (ie 0 dB with Tx autonull)
set Tx gain (ie 0dB)
Note: these two steps a required for the concurrent conversation only and do not affect new
call tone generation. See Standard Full-duplex handset call for required programming.
write tone coefficient 1
write tone coefficient 2
write warble rate coefficient
start new call tone ringer program
set new call tone gain
select speaker
enable new call tone
control ringer cadence by toggling
between gain control and tone ringer
with gain control programs
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Zarlink Semiconductor Inc.
MT9094
Address
15h
1Eh
1Dh
20h
21h
23h
24h
1Eh
0Eh
0Ah
1Eh
Address
15h
1Eh
1Dh
20h
23h
24h
26h
1Eh
0Bh
0Eh
0Fh
1Eh
28
bits 2 or 3 (as required)
00h
22h (or as required)
30h (or as required)
2Eh (or as required)
as required
as required
41h
as required
as required (0dB default)
as required
bits 2 or 3 (as required)
00h
70h (or as required)
30h (or as required)
as required
as required
as required
71h
NCTG2-1 (as required)
02h
9Bh (assuming a concurrent handset
call)
01h (assuming all other bits are µ-Law
71h (on)
31h (off)
71h (on) etc...
DATA
DATA
Data Sheet