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HT9320 Datasheet(PDF) 5 Page - Holtek Semiconductor Inc |
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HT9320 Datasheet(HTML) 5 Page - Holtek Semiconductor Inc |
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5 / 30 page  Pin Description Pin Name I/O Internal Connection Description C1~C8 R1~R5 I/O CMOS IN/OUT These pins form a 5´8 keyboard matrix which can perform keyboard input detection and dialing specification setting functions. When on-hook (HKS=high) all the pins are set high. While off-hook the column group (C1~C8) remains low and the row group (R1~R5) is set high for key input detection. For the HT9320L-X, the column group remains high and the row group is set low for key input detection. An inexpensive single contact 5´8 keyboard can be used as an input device. Pressing a key connects a single column to a sin- gle row, and actuates the system oscillator that results in a di- aling signal output. If more than two keys are pressed at the same time, no response occurs. The key-in debounce time is 20ms. Refer to the keyboard information for keyboard ar- rangement and to the functional description for dialing speci- fication selection. X1 I OSCILLATOR The system oscillator consists of an inverter, a bias resistor and the necessary load capacitor on chip. Connecting a stan- dard 3.579545MHz crystal or ceramic resonator to the X1 and X2 terminals can implement the oscillator function. The oscil- lator is turned off in the standby mode, and is actuated when- ever a keyboard entry is detected. X2 O XMUTE O NMOS OUT XMUTE is an NMOS open drain structure pulled to VSS dur- ing dialing signal transmission. Otherwise, it is an open cir- cuit. XMUTE is used to mute the speech circuit when transmitting the dial signal. HKS I CMOS IN This pin is used to monitor the status of the hook-switch and its combination with HFI/HDI can control the PO pin output to makeorbreaktheline. HKS=VDD:On-hookstate(PO=low).ExceptforHFI/HDI (hand-free/hold-lineco ntrolinput),other functionsarealldisabled. HKS=VSS:Off-hookstate(PO=high).The chipisinthestand- bymodeandreadytoreceivethekeyinput. PO O CMOS OUT This pin is a CMOS output structure which by receiving the HKS and HFO/HDO signals, control the dialer to connect or disconnect the telephone line. PO outputs a low to break line when HKS is high (on-hook) and HFO/HDO is low. PO outputs a high to make line when HKS is low (off-hook) or HFO is high or HDO is high. During the off-hook state, this pin also outputs the dialing pulse train in pulse mode dialing. While in the tone mode, this pin is always high. HT9320 5 July 21, 1999 |
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