Application Circuits

* Notes: The connection of the IRQ and RD pin is selectable depending on the requirement of the mC.

Adjust R (external pull-high resistance) to fit user¢s time base clock.

HT1620

14

July 26, 1999

0. 1 m F

IR Q

DA T A

CS

RD

WR

m C

H T 1620

LC D P a ne l

BZ

OSC I

OSC O

BZ

C r yst a l

3276 8H z

Os c i l l at or

C OM 0 ~ C OM 3

S E G0 ~ S E G 3 1

CC 1

C C 2

VE E

VO1 5 N

VD D

V D D

*

Pi e z o

1/ 2 or 1 / 3 B i a s ; 1 / 2 , 1/ 3 or 1 / 4 D ut y

R

*

3M W

0. 1 m F

0. 1 m F