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W91810AN Datasheet(PDF) 3 Page - Winbond |
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W91810AN Datasheet(HTML) 3 Page - Winbond |
3 / 26 page W91810N SERIES Publication Release Date: March 2000 - 3 - Revision A5 PIN DESCRIPTION SYMBOL 22-PIN 24-PIN 28-PIN I/O FUNCTION Column- Row Inputs 1 −5 & 18 −22 1 −5 & 20 −24 1 −6 & 23 −28 I The keyboard input is compatible with a standard 6 × 6 or 7 × 7 keyboard, an inexpensive single contact (Form A) keyboard, and electronic input. In normal operation, any single button can be pushed to produce dual tone, pulses, or functions. Activation of two or more buttons will result in no response except for a single tone. XT 9 9 10 I A built-in inverter together with an inexpensive 3.579545 MHz crystal supplies the oscillator. The oscillator stops when there is no keypad input. The crystal frequency deviation is 0.02%. XT 10 10 11 O Crystal oscillator output pin. T/P MUTE 11 11 12 O The T/P MUTE is a conventional CMOS N- channel open drain output. The output transistor turns on with a low level during a dialing sequence (both pulse and tone mode). Otherwise, it is off. K MUTE 17 19 22 O The K MUTE is a conventional CMOS N-channel open drain output. Toggle action speech mute control pin by MUTE key. MODE 15 17 20 I Connecting the mode pin to VSS places the dialer in tone mode. Connecting the mode pin to VDD places the dialer in pulse mode with an M/B ratio of 40:60. Leaving the mode pin floating places the dialer in pulse mode with an M/B ratio of 33.3:66.7. HKS 12 14 17 I The HKS (hook switch) input is used to sense whether the handset is on-hook or off-hook. In on-hook state, HKS = 1: chip is in sleeping mode, no operation. In off-hook state, HKS = 0: chip is enabled for normal operation. HKS pin is pulled to VDD by internal resistor. |
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