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W9145 Datasheet(PDF) 3 Page - Winbond |
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W9145 Datasheet(HTML) 3 Page - Winbond |
3 / 18 page W9145 SERIES Publication Release Date: August 1996 - 3 - Revision A4 SYMBOL 22-PIN 24-PIN I/O FUNCTION Column- Row Inputs 1 −4 & 18 −22 1 −4 & 20 −24 I Keyboard inputs may be connected to either a standard keyboard, an inexpensive signal contact (Form A) keyboard, or electronic input from a µC. A valid key entry is defined by a single row being connected to a single column. XT, XT 6, 7 6, 7 I, O A built-in inverter provides oscillation by means of an inexpensive 3.579545 MHz crystal or ceramic resonator. T/P MUTE 8 8 O The T/P MUTE is a conventional CMOS inverter that pulls to VDD in the absence of keypad input and pulls to VSS when an address keypad entry is sensed (excluding the * and # keypads in pulse mode). When any keypad in row 5 and column 5 is pushed, the mute out remains at high level. MODE 14 16 I Pull to VSS to enable tone mode. Pull to VDD to enable pulse mode (10 ppS). HKS 9 9 I Hook switch input. When pulled to high, chip is in on-hook state (no operation). When pulled to low, chip is in off- hook state (enabled for normal operation). This pin is pulled to VDD by internal resistor. Note: This pin operates in conjunction with the handfree control pins; for further information see description of handfree control pins below. B/M 16 16 I B/M = 1: Break/Make ratio is 60:40. B/M = 0: Break/Make ratio is 67:33. This pin has no function in tone mode. VDD, VSS 17, 5 19, 5 I Power input pins. X MUTE 13 15 O The X MUTE is a conventional CMOS inverter that in tone mode is active while a DTMF signal is being transmitted. In pulse mode, this output remains low at all times. |
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