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W91521AN Datasheet(PDF) 4 Page - Winbond |
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W91521AN Datasheet(HTML) 4 Page - Winbond |
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4 / 16 page  W91520N SERIES - 4 - Pin Description, continued SYMBOL 18-PIN 20-PIN I/O FUNCTION HFI, HFO - 10, 11 I, O Handfree control pins. The handfree control state is toggled on by a low pulse on the HFI input pin. The status of the handfree control state is described in the following table: CURRENT STATE Input HFO Dialing High Yes On Hook High Low No Off Hook High Low Yes On Hook Off Hook Low Yes Off Hook Low On Hook Low No Off Hook High On Hook High Yes Low Hook SW. HFO NEXT STATE HFI HFI HFI HFI pin is pulled to VDD by an internal resistor. Detailed timing diagrams are shown in Figure 3. BLOCK DIAGRAM ROW COLUMN DTMF XT XT RAM COUNTER SYSTEM CLOCK GENERATOR LOCATION LATCH D/A ROW & COLUMN PROGRAMMABLE COUNTER DATA LATCH & DECODER READ/WRITE (R1 to R4, Vx) (C1 to C4) T/P MUTE HFO CONTROL LOGIC PULSE CONTROL LOGIC KEYBOARD INTERFACE CONVERTER MODE HKS HFI DP/C5 H/P MUTE |
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Similar Description - W91521AN |
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