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W91F813AN Datasheet(PDF) 4 Page - Winbond |
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W91F813AN Datasheet(HTML) 4 Page - Winbond |
4 / 26 page W91F810N SERIES - 4 - Pin Description, continued SYMBOL 22-PIN 24-PIN 28-PIN I/O FUNCTION LOCK (W91F810LN/ F810ALN/ F811ALN 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. The timing diagram for pulse mode is shown in Figure 1(a, b). DTMF 14 16 19 O During pulse dialing, this pin remains in a low state regardless of the keypad input. In tone mode, it will output a dual or single tone. A detailed timing diagram for tone mode is shown in Figure 2(a, b). R1 R2 R3 R4 C1 C2 C3 Specified 697 770 852 941 1209 1336 1477 699 766 848 948 1216 1332 1472 Actual +0.28 -0.52 -0.47 +0.74 +0.57 -0.30 -0.34 Error % OUTPUT FREQUENCY |
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