TEA7092TQ Просмотр технического описания (PDF) - STMicroelectronics

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TEA7092TQ

TELEPHONE ANALOG FRONT END

STMicroelectronics 

TEA7092

MICROCONTROLLER INTERFACE (continued)

Serial Bus Interface (data and clock)

The serial bus uses 7 bits, a standard 8 bit word

can be sent, the TEA7092 take care only of the

seven first bits.

The different codes are :

- The ring start up code

- The ring frequency control code

- The mode codes :

• Handset mode

• Group listening mode

• Handsfree mode

- The operating codes (these codes are used un-

der each code mode) :

• Speech

• Dialing

• Microphone mute

• Earphone/Microphonemute

• Error beep

• Sine wave high frequency

• Sine wave low frequency

- The data codes (DTMF, sinus wave, ring fre-

quency, error beep frequency codes) :

These data codes are stored inside the TEA7092

and are used as soon as an operating code is

sent, dialing, error beep, sine wave or ring melody

control or ring start up code.

- The configuration codes (those codes are ”flip-

flop” codes) :

• AGC/no AGC

• No mask / mask

Figure 8 : 7 Bit Codes Data and Clock Input Timing

• Normal gain/normal gain +6dB, on receive

channel

• Two sidetone network/one sidetone network

• Squelch/No squelch

• Line current variation initialization (No trans-

fer/Transfer)

• Minus 21dB in Ring Mode

• Minus 6dB in Sending Mode

• Oscillator Stand-by

For instance : The first time that the +6dB code is

sent, the receive gain increases of +6dB. If it is sent

again, the receive gain goes back to normal value.

- The loudspeaker level control codes

- The reset code to inialize the TEA7092 and to set

the reset output to ”0” low logic level

- The Init code to initialize the TEA7092, software

initialization to set the TEA7092 in the start up

condition.

- The start up condition of the TEA7092 is :

• Handset mode.

• Speech.

• No mask.

• AGC in transmit and receive channels.

• Normal gain on receive channel.

• Squelch on transmit channel.

• Two sidetone networks.

• No transfer.

• Oscillator ON.

• PON line threshold current : 12mA.

• Anti-acoustic feed-back attenuation : 15dB.

Datas will change during Clk = 1

t1 t3 t2

t4

t5

Ik Data

ata

a0

a1

a2

a3

a4

a5

a6

Synchro

t1 = t2 = t4 = t5 = 1µs

t3 = 2µs

14/24

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