HT1350 datasheet(3/6 Pages) HOLTEK

3 / 6 page

Pad Description

Pad No

Pad Name

I/O

Internal

Connection

Descriptions

TEST2

I/O

For IC test only

TEST1

I/O

For IC test only

OSC2

Oscillator output

OSC1

Oscillator input

5~18

OUT17~OUT4 O

CMOS

Display data output pads for segments

19~21

COM3~COM1 O

NMOS

Display data output pads for commons

CP3

Bias supply voltage pad for driving the LCD panel

23~24

CP2~CP1

LCD bias supply voltage control pads

STEP

CMOS

Pull-high

Step sensor input pad

WALK/RUN

CMOS

Pull-high

Walk/Run mode manual set pad

AUTO/MANU

CMOS

Pull-high

Auto detection/Manual set selection pad

VDD

Positive power supply

TEST3

I/O

For IC test only

VSS

Negative power supply (GND)

MODE

CMOS

Pull-high

LCD display mode selection

RESET

CMOS

Pull-high

System reset pad

Approximate internal connection circuits

HT1350

June 28, 1999

NM O S O UT

(F o r C O M 1 ~ C O M 3 )

CM O S I N

Pu l l - h i g h

CM O S O UT

OS C I L L A T OR

CP 1 ~ CP 3

VD D

V D D

OS C 1

OS C 2

VD D

CO M 1 ~

CO M 3

VS S

CP 1

CP 3

CP 2

HT1350 Datasheet(PDF) 3 Page - Holtek Semiconductor Inc

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