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SC9302D Datasheet(PDF) 11 Page - Silan Microelectronics Joint-stock |
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SC9302D Datasheet(HTML) 11 Page - Silan Microelectronics Joint-stock |
11 / 39 page Silan Semiconductors SC9302 Series HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD Rev: 2.0 2001-11-01 11 (continued) HFI I CMOS IN Pull-Low This pin is a schmitt trigger input structure. Active high. Applying a positive going pulse to HFI can toggle the HFO once and hence control the hand-free function. The pull-low resistance of HFI is 200K Ω typically. An external RC network is recommended to use for the input debouncing. HFO O CMOS OUT The HFO is a CMOS output structure. Its output is toggle controlled by a positive transition on HFI pin. When HFO is high, the hand-free function is enabled and PO outputs 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, provided to the user for controlling the long distance call function with a lock-switch. LOCK=OPEN: Normal dialing (no lock). LOCK=V DD: “0,9” is inhibited for use as the first key input. LOCK=V SS: “0” is inhibited for use as the first key input. DOUT O NMOS OUT This is an NMOS open drain output pin. It outputs the BCD code of the dialing digits to the LCD driver chip (SC16XX series) or µC 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 train for the D OUT data synchronization. The DOUT data is valid at the falling edge of clock. V DD I -- Positive power supply, 2.0V~5.5V for normal operation. V SS I -- Negative power supply. FUNCTION DESCRIPTIONS 1. KEYBOARD MATRIX The 1 C ~ 4 C and 1 R ~ 4 R make up of a keyboard matrix. Together with a standard 4x4 keyboard, the keyboard matrix is used for dialing entrance. In addition, the keyboard matrix provides resistor option for different dialing specification selections. The keyboard arrangement for each of the SC9302 series are listed in KEYBOARD INFORMATION. |
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