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W91F811AN Datasheet(PDF) 5 Page - Winbond |
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W91F811AN Datasheet(HTML) 5 Page - Winbond |
5 / 26 page W91F810N SERIES Publication Release Date: March 2000 - 5 - Revision A2 Pin Description, continued SYMBOL 22-PIN 24-PIN 28-PIN I/O FUNCTION VDD, VSS 16, 8 18, 8 21, 9 I Power input pins for the dialer chip. VDD is the power and VSS is the ground. V1, V2 - - 14, 15 O Volume control output pins. These two pins can be toggled by the volume control keys (Vup, Vdown). These two pins output is a conventional CMOS N- channel open drain output. HFI , HFO - 12, 13 13, 16 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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