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W91F822N Datasheet(PDF) 4 Page - Winbond |
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W91F822N Datasheet(HTML) 4 Page - Winbond |
4 / 20 page Preliminary W91F820N SERIES - 4 - Pin Description, continued SYM. 20-PIN 22-PIN I/O FUNCTION H/P MUTE 6 6 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 12 14 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 15 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 VDD, VSS 15, 7 17, 7 I Power input pins for the dialer chip. VDD is the power and VSS is the ground. HFI, HFO - 11, 12 I, O Handfree control pins. A low pulse on the HFI input pin toggles the handfree control state. The status of the handfree control state is listed in the following table: HOOK SW. - On Hook Off Hook On Hook Off Hook Off Hook CURRENT STATE NEXT STATE HFO Low High High - Low High INPUT HFI HFI HFI Off Hook On Hook On Hook HFO High Low Low Low Low High DIALING Yes No Yes Yes No Yes The HFI pin is pulled to VDD by an internal resistor. A detailed timing diagram is shown in Figure 3. |
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Similar Description - W91F822N |
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