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SC9302DT Datasheet(PDF) 9 Page - Silan Microelectronics Joint-stock |
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SC9302DT Datasheet(HTML) 9 Page - Silan Microelectronics Joint-stock |
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9 / 39 page  Silan Semiconductors SC9302 Series HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD Rev: 2.0 2001-11-01 9 PIN DESCRIPTION Pin Name I/O Internal Connection Description 1 C ~ 4 C 1 R ~ 4 R I/O CMOS IN/OUT These pins construct a 4x4 keyboard matrix to perform the keyboard input detecting and dialing specification setting functions, when on-hook ( HKS =high) all the pins are set to high. While off-hook the column group ( 1 C ~ 4 C ) stays low and the row group ( 1 R ~ 4 R ) is set to high for key input detecting. An inexpensive single contact 4x4 keyboard can be an input device. Pressing a key connects a single column to a single row, and actuates the system oscillator to result in a dialing signal output. If more than two keys are pressed at the same time, no response can be brought about. The key-in debounce time is 20ms. Refer to the keyboard table for keyboard arrangement and to the functional description for dialing specification selection. X1 I X2 O OSCILLATOR The system oscillator consists of an inverter, a bias resistor and the necessary load capacitor on chip. Connecting a standard 3.579545MHz crystal or ceramic resonator to X1 and X2 terminals can implement the oscillator function. The oscillator is turned off in the stand-by mode, and is actuated whenever a keyboard entry is detected. XMUTE O NMOS OUT The XMUTE is an NMOS open drain structure pulled to VSS during dialing signal transmitting. Otherwise, it is an open circuit. The 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 make or break the line. HKS =VDD: On-hook state ( PO =low). Except HFI/ HDI (hand-free / hold-line control input), other functions are all disabled. HKS =VSS: Off-hook state ( PO =high). The chip is in the stand-by mode and ready to receive the key input. (to be continued) |
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