1997 Apr 16

9

Philips Semiconductors

Product specification

4-digit LCD car clock

PCF1171C

APPLICATION INFORMATION

Fig.5 Typical application diagram.

(1) Only required if internal regulation is disconnected.

From pin 2 (OSC IN) to any other pin the stray capacitance should not exceed 2 pF.

MSA982

23

(V

)

DD

VDD

21

S6

S5

VDD

VSS

VDD

VSS

S6

selectable

correction mode

S5

12/24 hour mode

22

SHUNT

VOLTAGE

REGULATOR

TR

TS

OSC

IN

OSC

OUT

C

= 5 pF to 25 pF

T

4.19 MHz

EXT

I

R = 4.7 k

Ω to 8.2 kΩ

battery

38

39

40

2

1

I

2 I

DD

i

I REG

4

S3

18

S2

3

S1

S3

2 minutes correction

S2

set minutes

S1

set hour

S4

S4

internal voltage

regulation

19

20

VSS

segment

drivers

to LCD

(1)

33

µF to

100

µF

PCF1171C