PCF1178CT 데이터 시트보기 (PDF) - Philips Electronics
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PCF1178CT Datasheet PDF : 20 Pages
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Philips Semiconductors
4-digit duplex LCD car clock
Product specification
PCF1178C
FUNCTIONAL DESCRIPTION AND TESTING
Outputs
The circuit outputs 1 : 2 multiplexed data (duplex) to the
LCD. Generation of BP1 and BP2 (three-level backplane
signals) and the output signals are shown in Fig.4.
The average voltages across the segments are:
1. VON(RMS) = 0.79 VDD
2. VOFF(RMS) = 0.35 VDD.
A1
A2
A3
A4
AM
B1 F2
B2
G1
G2
F3
B3 F4
B4
G3
G4
COL
PM E1
C1 E2
C2
E3
C3 E4
C4
D1
D2
D3
D4
MLB251
Fig.2 Segment designation of LCD.
TIME
PM
(a)
a. 12-hour mode.
MSA993
TIME
MSA994
(b)
b. 24-hour mode.
Fig.3 Typical displays.
VDD
BP1 VDD /2
0
VDD
BP2 VDD /2
0
SEGMENT
1
ON
OFF
ON
OFF
SEGMENT
2
ON
VDD
0
VDD
ON
0
OFF
VDD
0
OFF
VDD
0
MSB226
15.625 ms
Fig.4 Backplane and output signals.
1997 Apr 16
4
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