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W91574DNF Datasheet(PDF) 5 Page - Winbond |
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W91574DNF Datasheet(HTML) 5 Page - Winbond |
5 / 45 page W91570DN SERIES Publication Release Date: May 1997 - 5 - Revision A2 Pin Description, continued SYMBOL PIN NO. I/O FUNCTION B/M 11 I Make:Break ratio select pin. If B/M = VDD, the M/B ratio is 40:60. If B/M = VSS, the M/B ratio is 33.3:66.7. The B/M pin is pulled to VDD by internal resistor. LOCK 10 (for all lock version) I The LOCK pin is used to prevent "0" or "9" dialing under PABX system long distance call control. When the first key input after reset is "0" or "9", all the key inputs, including "0" or "9" key, become invalid, and the chip generates no output. The telephone is reinitialized by a reset. The following table describes the functions of the LOCK pin: LOCK PIN Floating VDD SS V FUNCTION Normal dialing "0", "9" dialing inhibited "0" dialing inhibited COM1 to COM4 49 to 52 O COM1 to COM4 are the common signal output terminal for the 1/4 duty LCD. SEG1 to SEG32 53 to 80, 1 to 4 O SEG1 to SEG32 are the 16-digit segment signal outputs. VLCD 45 O Power supply pin for LCD driver. A 0.1 µF capacitor is connected between VLCD and VSS. CP, CN 48, 47 I CP is the voltage control capacitor positive pin. CN is the voltage control capacitor negative pin. A 0.1 µF capacitor is connected between these two pins. VDD, VSS 9, 14 I Power input pins. XT2, XT2 43, 44 I, O A quartz crystal oscillator provides an RTC frequency time base of 32.768 KHz. VRTC1, VRTC2 38, 46 I Either VRTC1 should be connected to a 1.5V battery (W91572DN/576DN) or VRTC2 should be connected to a 3.0V battery(W91574DN/578DN), which supplies the power source for the RTC. SET RTC 13 I In the chip enable state, pulling SET RTC to VSS toggles the RTC set function on/off, when the set function is toggled on, the RTC can be set using the "HOUR" and "MIN" keypads. |
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