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W91813AN Datasheet(PDF) 4 Page - Winbond |
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W91813AN Datasheet(HTML) 4 Page - Winbond |
4 / 26 page W91810N SERIES - 4 - Pin Description, continued SYMBOL 22-PIN 24-PIN 28-PIN I/O FUNCTION KT (W91810N/81 0AN/812N/812 AN/811AN/813 AN only) 6 6 7 O The key tone output is a conventional CMOS inverter. The key tone is generated when any valid key is pressed; the KT pin generates a 1.2 KHz square wave at 35 mS. When no key is pressed, the KT pin remains in low state. LOCK (W91810LN/ 810ALN/ 811ALN only) 6 6 7 I The function of this terminal is to prevent "0" dialing and "9" dialing under PABX system long distance call control. When the first key input after reset is 0 or 9, all key inputs, including the 0 or 9 key, become invalid and the chip generates no output. The telephone is reinitialized by a reset. The function of the LOCK pin is shown below: LOCK PIN FUNCTION VDD VSS Floating "0", "9" dialing inhibited Normal dialing Mode "0" dialing inhibited H/P MUTE 7 7 8 I The H/P MUTE is a conventional inverter output. During pulse dialing, flash break or hold period, this output is active high; otherwise, it remains in low state. DP 13 15 18 O N-channel open drain dialing pulse output. Flash key will cause DP to be active in either tone mode or pulse mode. In lock mode, the DP remains low for 300 mS during off-hook delay time. The timing diagram for pulse mode is shown in Figure 1(a, b). |
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