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TEA7088A Datasheet(PDF) 8 Page - STMicroelectronics |
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TEA7088A Datasheet(HTML) 8 Page - STMicroelectronics |
8 / 17 page MICROCONTROLLER INTERFACE WITH TEA7088A All inputs can be driven by a Low level max. of 0.1 x VRMC and a high level min. of 0.9 x VRMC. Inputs MSK, DCL and DATA have internal pull-up resistors of 120k Ω and input OSC has a internal pull up of 240k Ω. All outputs can drive a ±1mA typical. Power Supply The microcontroller is power supplied by a 3.4V regulated supply (VRMC) and by an unregulated power supply (VMC). The two supplies are connected through a serial regulator.The unregulatedpower supply (VMC) has a DC voltageequal to: V12 - 0.6V and must be lower than 6V. It is also possible to connect a battery at Pin VMC and use the regulated output at Pin VRMC to supply a LCD driver. The current consumption on the serial regulator has a typical value of 60 µA. Power ON (PON) The TEA7088Ageneratesa power on signal (PON) as soon as the voltage on Pin VRMC is higher than 2.6V (0.75 x VRMC final) and the line current is pre- sent. Note : D u ri ng th e b r eak per i od i n t he loopdisconndect and Flash mode and during the exchange line break, the power ON signal goes to low level. Maximum delay for Pon decay edge after ILine goes to zero is 50ms (with C8 = 47 µF, C11 = 1µF, C27 = 10 µF). Reset The TEA7088Agenerates a rise edge Reset signal as soon as the logic power supply is higher than 2.6V (0.75 x VRMC final). RESET remains high until VRMC decreases below 2.5V or the RESET control code is received. In Ring, RESET is identical to RI output. Only new positive edge PON, derived on opening and closing the line, is forcing the default mode again. The Reset control code is only active in speech mode. Serial Bus Interface (Data and Clock) The serial bus uses 6 bits. Astandard 8 bit bus can be used, bits a6 and a7 are not take in account by the TEA7088A. Different types of codes are used : a) The Ring Control Code : - Ring start up - Output level codes b) The Operating Code : - Speech - Dialing - Microphone mute - Earphone/Microphone mute c) The Data Codes (DTMF, ring frequencies) : Those data codes are stored inside the TEA7088Aand are used as soon as the dialing code or the ring start code is received. d) The Configuration Code : - AGC / no AGC (toggle) - No mask / mask (Low DC in ”make”) (toggle) - Normal gain / normal gain +6dB, on receive channel (toggle) - 1.79MHz external clock / 3.58MHz internal oscillator (toggle) Those configuration cod es are ”Flip-Flop” codes. For instance : The first time that the+6dB code is sent, the receive gain increases of +6dB. If the same code is sent again, the receive gain goes back to normal value. In the same way the 3.58MHz internal oscillator can be switched OFF with a second transmission of the proper code. e) The RESET Code : Reset code from the MCU will reset internallogic of TEA7088A to default mode and will induce TEA7088A to generate a ”RESET” status ”low” to the MCU on Pin 19. Warning : the ”RESET” code deactivates the serial bus interface which is reactivated only after a ”ON-HOOK/OFF-HOOK” sequence. f) The INITIALIZATION Code : Initialization code from the MCU will reset the internal logic of TEA7088A to default mode, but the TEA7088Awill not generatereset command to the MCU on Pin 19. TEA7088A 8/17 |
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Descripción similar - TEA7088A |
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