SC3449

HANGZHOU SILAN MICROELECTRONICS CO.,LTD

REV:1.1

2007.11.19

Http: www.silan.com.cn

Page 4 of 23

(Continued)

Pin No.

Pin name

Pin description

21

TEST

Testing input (internal pull-down) , high active

29

X32I

32.768KHz crystal oscillator input

[note]

28

X32O

32.768KHz crystal oscillator output

26

ROSC

R oscillator input, connect to VDD by a resistor

37 ~ 30

PA7 ~ 0

Input/output port

38 ~ 40

24 ~ 22

20 ~ 19

COM8 ~ COM6

COM5 ~ COM3

COM2 ~ COM1

LCD common output

41 –51

53 –83

1 - 18

SEG60 ~ SEG50

SEG49 ~ SEG19

SEG18 ~SEG1

LCD segment output

[note]

Note: The 32kHz crystal oscillation of the chip is gained by Rosc frequency detaching, therefore no need to add a

32768Hz crystal oscillator outside, the pin X32I should attach to Vss, pin X32O hang in the air.

The CMOS chip has already enacted seg8

seg1 to input by reusing the keys simultaneously. That is

besides the LCD display, it can also be as input keys combining with Pa7~Pa1.

FUNCTION DESCRIPTION

1. Calculator function

1 LCD display

Screen with dual row display. See the LCD display screen sketch map on the seventh section.

The first row shows the formulas that are input by 6*5 lattice display.

The second row shows the calculating results.

The bottom shows the mark of the calculating state.

2 Calculation mode

Application

Mode name

Mode directional symbol

Calculation mode

General calculation

COMP

Standard tolerance calculation

SD

SD

Regression calculation

REG

REG

Angle unit mode

Degree

DEG

D

Radian

RAD

R

Centigrade

GRA

G

Display mode

Exponent display (cancel the decimal fraction

(FIX) and efficient digits enactment (SCI))

NORM1

NORM2

Decimal digits enactment

FIX

Fix

Efficient digits enactment

SCI

Sci