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W91562DNH Datasheet(PDF) 3 Page - Winbond |
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W91562DNH Datasheet(HTML) 3 Page - Winbond |
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3 / 33 page  Preliminary W91560DN SERIES Publication Release Date: May 1997 - 3 - Revision A2 PIN DESCRIPTION SYM. PIN NO. I/O FUNCTION Row, Column Inputs 18 −21, 13 −17 I The keyboard inputs may be used with either the standard 5 × 6 keyboard, an inexpensive single contact (form A) keyboard or electronic input. A valid key entry is defined by a single row being connected to a single column. XT1, XT1 22, 23 I, O A built-in inverter provides oscillation with an inexpensive 3.579545 MHz crystal or ceramic resonater. The oscillator ceases when a keypad input is not sensed after the chip is enabled and dialing is finished. The crystal frequency deviation is ±0.02%. T/P MUTE 8 O The T/P MUTE is a conventional CMOS N-channel open drain output. The output transistor is switched on low level during the dialing sequence (both pulse and tone mode), one-key redial break and flash break. Otherwise, it is switched off. H/P MUTE 9 (W91560DNF, W91562DNF, W91564DNF, W91565DNF only) O The H/P MUTE is a conventional CMOS inverter output, During pulse dialing, one-key redial break, flash break and hold functions, this pin will output an active high. It remains in a low state at all other times. LOCK 9 (W91561DLNF, W91563DLNF only) I The LOCK pin is used to prevent "0" or "9" dialing under PABX system long distance call control. When the first key input after reset is "0" or "9", all the key inputs, including the "0" or "9" key, become invalid, and the chip generates no output. The telephone is reinitialized by a reset. The following table describes the functions of the LOCK pin: LOCK PIN Floating VDD SS V FUNCTION Normal dialing "0", "9" dialing inhibited "0" dialing inhibited HKS 24 I Hook switch input. HKS = VDD or floating: On-hook state. Chip in sleeping mode, no operation. HKS = VSS: Off-hook state. Chip enable for normal operation. HKS pin is pulled to VDD by internal resistor. |
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