PCF1171C View Datasheet(PDF) - Philips Electronics

Part Name

Description

Manufacturer

PCF1171C

4-digit LCD car clock

Philips Electronics 

Philips Semiconductors

4-digit LCD car clock

Product specification

PCF1171C

A1

A2

A3

A4

F1

G1

B1 F2

G2

B2 P1 (P3) F3

G3

B3 F4

G4

B4

E1

C1 E2

C2 P2 (P4) E3

C3 E4

C4

D1

D2

D3

D4

MSA984

Fig.2 Segment designation of LCD.

TIME

MSA985

Fig.3 Display mode (24-hour mode shown).

OPERATIONAL INPUTS

Operational inputs S1, S2 and S3 have an internal pull-up

resistor to facilitate use of external single-pole,

single-throw switches. A specific debounce circuit is

integrated as protection against contact debounce and

parasitic voltages.

In the description below, an arrangement as shown in

Fig.5 is assumed and S1, S2 and S3 refer to the external

switches rather than the corresponding inputs.

Set hours, switch S1

Closure of S1 increments the hours according to the

correction mode selected by S6 (see Chapter

“Input options”).

Set minutes/reset seconds, switch S2

When S2 is closed, the minute setting is corrected

according to the correction mode determined by S6 (see

Chapter “Input options”).

The seconds counter is reset to zero each time S2 is

closed, and begins running each time S2 is opened.

Segment test/reset, switches S1 and S2

If S1 and S2 are closed simultaneously all LCD segments

are switched on. When the switches are released, the

clock starts at 1 : 00 in the 12-hour mode or 0 : 00 in the

24-hour mode.

1997 Apr 16

4

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