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W91472N Datasheet(PDF) 3 Page - Winbond |
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W91472N Datasheet(HTML) 3 Page - Winbond |
3 / 14 page W91472N SERIES Publication Release Date: May 1997 - 3 - Revision A2 Pin Description, continued SYMBOL 18-PIN 20-PIN I/O FUNCTION MODE 13 15 I Pulling mode pin to VSS places dialer in tone mode. Pulling mode pin to VDD places dialer in pulse mode with M/B ratio of 40:60 (10 ppS, except for 91472BN/472CN = 20 ppS). Leaving mode pin floating places dialer in pulse mode with M/B ratio of 33.3:66.7 (10 ppS, except for W91472BN/472CN = 20 ppS). HKS 10 12 I The HKS input is used to sense whether the handset is on-hook or off-hook. In on-hook state, HKS = 1: chip is in sleeping mode, no operation. In off-hook state, HKS = 0: chip is enabled for normal operation. HKS pin is pulled to VDD by internal resistor. DP / C6 11 13 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, c, d). DTMF 12 14 O During pulse dialing, this pin remains in low state regardless of keypad input. In the tone mode, it will output a dual or single tone. A detailed timing diagram for tone mode is shown in Figure 2 (a, b, c, d). 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 14, 6 16, 6 I Power input pins for the dialer chip. VDD is the main power and VSS is the ground. |
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