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EM32117

16 DIGIT LCD DRIVER WITH CHECK TIME FUNCTION

ELAN Microelectronics 

FUNCTION BLOCK DIAGRAM

EM32117

16 DIGIT LCD DRIVER WITH CHECK TIME FUNCTION

Preliminary

COM0~3

SEG0~31

SD1

XIN

XOUT

VDD

VSS

1/4 Duty 1/3 bias LCD Driver

Serial Data

Sampling

&

Decoding

Serial Data

Display Buffer

RTC/STW

Counter

Sampling

Signal

Generator

OSC

Power

Supply

Circuit

Timing

&

Control

Circuit

GF

ENCLND

ENRTC

24/12

HKS

MS2

MS1

TEST

PIN DESCRIPTION

Pin Name

SPARE1, SPARE2

COM0~COM3

SEG0~SEG31

TEST

MS1

MS2

SDI

HKS

VDD, VSS

V2, V3

VC1, VC2

XIN, XOUT

24/12

ENCLND

ENRTC

GF

Description

Need to be connected to VSS.

LCD panel driver common output pins.

LCD panel driver segment output pins.

Reserved for testing, should be left open.

Manual setting and check last conversation time input pin 1, with built-in pull-up optimal

resistor. The optimal resistor before keying=100kΩ, after keying change to 1MΩ for

reducing power consumption.

Manual setting input pin 2 with built-in pull-up; optimal resistor. The

optimal resistor before keying=100kΩ, after keying change to 1MΩ for reducing power

consumption.

Serial data input pin with built-in 150 KΩ pull-up resistor.

Hook switch status input pin with built-in 1 MΩ pull-up resistor.

Positive power supply pin.

Voltage tripler circuit for LCD driver.

Voltage tripler circuit for LCD driver.

Crystal input and output pins for connecting a 32768Hz crystal (Internal built-in 2-p

capacitor).

RTC display 24 or 12 hours format selection pin (when this pin is pulled "high, RTC will

be displayed in 24 hour format. Otherwise will be display in 12 hour format).

Calendar enable pin. When disabled (ENCLND* = high), the Calendar field of LCD

panel will be blanked. When 12 digit LCD panels are used, Calendar should be disable

to suppress output of calendar.

RTC enable pin. When disabled (ENRTC* = high), the LCD panel will be blanked when

HKS pin is at high level.

General Flag input pin without built-in resistor. When GF pull "High" LCD panel will

display Icon. GF pull "Low", "GF" Icon will blank.

* This specification are subject to be changed without notice.

3.17.1999 2

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