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HT9302 Datasheet(PDF) 4 Page - Holtek Semiconductor Inc |
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HT9302 Datasheet(HTML) 4 Page - Holtek Semiconductor Inc |
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4 / 27 page  Pin Name I/O Internal Connection Description DTMF O CMOS OUT This pin is active only when the chip transmits tone dialing signals. Otherwise, it always outputs a low. The pin outputs tone signals to drive the external trans- mitter amplifier circuit. The load resistor should not be less than 5k W. HDI I CMOS IN Pull-high This pin is a Schmitt trigger input structure. Active low. Applying a negative go- ing pulse to this pin can toggle the HDO output once. An external RC network is recommended for input debouncing. The Pull-high resistance is 200k W typ. HDO O CMOS OUT The HDO is a CMOS output structure. Its output is toggle- controlled by a nega- tive transition on HDI. When HDO is toggled 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. Refer to the functional description for the hold-line function. HFI I CMOS IN Pull-low This pin is a Schmitt trigger input structure. Active high. Applying a positive go- ing pulse to HFI can toggle the HFO once and hence control the hand-free func- tion. The Pull-low resistance of HFI is 200k W typ. An external RC network is recommended for input debouncing. HFO O CMOS OUT The HFO is a CMOS output structure. Its output is toggle- controlled by a posi- tive transition on HFI pin. When HFO is high, the hand-free function is enabled and PO outputs a high to connect the line. The hand-free function can be released by setting HDO high or by an on-off-hook operation or by another HFI input. Refer to the functional description for the hand-free functional operation. LOCK I/O CMOS IN/OUT This is a three-state input/output pin, used for controlling long distance call function with a lock-switch. LOCK=OPEN: Normal dialing (no lock) LOCK=VDD: ²0, 9² is inhibited for use as the first key input LOCK=VSS: ²0² is inhibited for use as the first key input DOUT O NMOS OUT NMOS open drain output pin. It outputs the BCD code of the dialing digits to the LCD driver chip (HT16XX series) or MCU for dialing number display. Refer to the functional description for the detailed timing. CLOCK O NMOS OUT NMOS open drain output. When dialing, it outputs a series of pulse trains for DOUT data synchronization. DOUT data is valid at the falling edge of clock. VDD ¾¾ Positive power supply, 2.0V~5.5V for normal operation VSS ¾¾ Negative power supply, ground Approximate internal connection circuits HT9302 Series Rev. 1.20 4 September 30, 2002 N M O S O U T V D D C M O S I N / O U T C M O S I N P u l l - l o w C M O S I N P u l l - h i g h C M O S I N O S C I L L A T O R X 1 X 2 1 0 M W 2 0 p . 1 0 p . C M O S O U T V D D V D D |
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