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TEA7088A Arkusz danych(PDF) 10 Page - STMicroelectronics |
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TEA7088A Arkusz danych(HTML) 10 Page - STMicroelectronics |
10 / 17 page The Start Up Conditions of the TEA7088A As soon as RESET is high and before sending any code the circuit is in the following default configu- ration : - Speech - No mask - AGC ON in transmit and receive channels - Normal gain on receive channel - 1.79MHz input clock (oscillator in stand by) 6 bit Codes Between two DTMF or ring frequencies, introduc- ing a Mute or speech code implies to wait 1ms to end the sinewave or square period. DTMF Dialing To dial in DTMF the following sequence of codes must be sent : DTMF Frequency code : 00XXXX Dialing Mode code : 010001 Mute or SPEECH code : 010010 or 010000 The duration of the DTMF signal is fixed by the delay between Dialing mode code and MUTE or SPEECH code. Pulse Dialing The pulse dialing function is performed by the microcontroller through the high voltage stage. The ”MAKE” voltage over the TEA7088A during dialing can be reduced by sending the mask code 0010101. To recover the normal speech voltage at the end of dialing the mask code must be sent again. If the mask code is not used the voltage over the TEA7088A during dialing is the same as in speech mode. Ring Indicator (RI) In ring mode TEA7088A generates a high logic level on Pin RI as soon as the voltage on Pin VRING is higher than VTHRI ON (19V Typ.), and the voltage on VRMC is higher than 3.4V. When the voltage on VRMC becomes higher than 2.6V, RESET signal becomes also high. Mask Input (MSK) MSK input must be high by default (Figure 10). In speech configuration forcing MSK input to low level will have same functionality than the MASK code. For ring mode when it is necessary to send other frequencies than the 8 basic ones, this input allows to drive the buzzer output. MICROCONTROLLER INTERFACE WITH TEA7088A (continued) a 0 a1 a 2 a3 a4 a 5 a6 t1 t2 t4 t5 CLK Data Data Synchro Datas with a Change During CLK = 1 t3 t3 t0 t0, t1, t2, t3, t4, t5 > 1 µs Figure 9 : DATA/CLOCK Timing I L MSK P ULSE MODE OTHER MODES OTHER MODES FLASH MODE Figure 10 : MASK Timing TEA7088A 10/17 |
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