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SC9302H Datasheet(PDF) 10 Page - Silan Microelectronics Joint-stock |
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SC9302H Datasheet(HTML) 10 Page - Silan Microelectronics Joint-stock |
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10 / 39 page  Silan Semiconductors SC9302 Series HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD Rev: 2.0 2001-11-01 10 (continued) PO O CMOS OUT This pin is a CMOS output structure, it receives HKS and HFO/HDO signals to control the dialer so as to connect or disconnect the telephone line. PO outputs low to break line when HKS is high (on-hook) and HFO/HDO is low. PO outputs high to make line when HKS is low (off- hook) or HFO is high or HDO is high. During the off-hook state, the pin also outputs the dialing pulse train in pulse mode dialing. While in the tone mode, this pin is always high. MODE I/O CMOS IN/OUT This is a three-state input/output pin, provided to the user for selecting a dialing mode among Tone/20pps/10pps. MODE=V DD: Pulse mode, 10pps. MODE=OPEN: Pulse mode, 20pps. MODE=V SS: Tone mode. During the pulse mode dialing, switching this pin to the tone mode changes the following entrance of digits to the tone mode. When the chips are working in the tone mode, the switching from tone to the pulse mode will be recognized. DTMF O CMOS OUT This pin is active only when the chip transmits tone dialing signals. Otherwise, it always outputs low. The pin outputs tone signals to drive the external transmitter amplifier circuit. The load resistor should not be less than 5k Ω. HDI I CMOS IN Pull-High This pin is a schmitt trigger input structure. Active low. Applying a negative going pulse to this pin can toggle the HDO output once. An external RC network is recommended to use for the input debouncing. The pull-high resistance is 200k Ω typically. HDO O CMOS OUT The HDO is a CMOS output structure. Its output is toggle controlled by a negative transition on HDI . When HDO is toggled to high, PO keeps high to hold the line. The hold function can be released by setting HFO high or by an on-off hook operation or by another HDI input. The HDO pin can directly drive the melody generator to produce hold-line background melody. Refer to the functional description for the hold-line function. KT O CMOS OUT Key-tone output pin. It outputs 1.2kHz tone carrier when any key is pressed in the pulse mode or when the function keys are pressed in the tone mode. (to be continued) |
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