TEA7092 ST Microelectronics, Inc., TEA7092 Datasheet - Page 16

• Manufacturer Part Number: TEA7092
• Description: Telephone Analog Front End
• Manufacturer: ST Microelectronics, Inc.

TEA7092
MICROCONTROLLER INTERFACE (continued)
HFIN Input Selection
For answering machine or cordless connection it can be requested to select HFIN input without enabling
the loudspeaker. For this the following procedure should be sent :
- Handsfree code 0110010.
- Tx & Rx mutes 0010010.
- HFIN input select 0110111.
To go back to handsfree mode, send :
- Speech code 0010000.
To go back to handset mode, send :
- Speech code 0010000.
- Handset code 0110000.
The Loudspeaker Control Code
The Data Codes
These codes are used in three different ways, depending of the operating code sent after the data codes :
- In DTMF dialing : Data code+Dialing code
- In Single sine wave : Data code+Sine wave high frequencies (or Sine wave low frequencies)
- In Ring mode, to program the Fi parameter, the Data code is following by the divider code n. Fi and n
16/24
a6 a5 a4 a3 a2 a1 a0
codes fix the ring output frequency.
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
a6
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
a5
Codes
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
a4
0
0
0
0
0
0
0
0
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
Codes
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
a3
0
0
0
0
0
0
0
0
Key
“C”
“D”
“A”
“B”
“2”
“1”
“3”
“8”
“7”
“9”
“5”
“4”
“6”
“0”
“#”
“*”
DTMF Dialing Mode
a2
0
0
0
0
1
1
1
1
DTMF Frequencies
1336Hz + 697Hz
1209Hz + 697Hz
1633Hz + 697Hz
1477Hz + 697Hz
1336Hz + 852Hz
1209Hz + 852Hz
1633Hz + 852Hz
1477Hz + 852Hz
1336Hz + 770Hz
1209Hz + 770Hz
1633Hz + 770Hz
1477Hz + 770Hz
1336Hz + 941Hz
1209Hz + 941Hz
1633Hz + 941Hz
1477Hz + 941Hz
a1
0
0
1
1
0
0
1
1
a0
0
1
0
1
0
1
0
1
Gmax -28dB
Gmax -24dB
Gmax -20dB
Gmax -16dB
Gmax -12dB
Gmax -8dB
Gmax -4dB
Gmax
Sine Wave Generator
348 or 604Hz
426 or 738Hz
385 or 668Hz
470 or 816Hz
Loudspeaker
Level Control
Remarks
19455Hz
23551Hz
21308Hz
26321Hz
Fi