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PCF1178CU Datenblatt(PDF) 4 Page - NXP Semiconductors

Teilenummer PCF1178CU
Bauteilbeschribung  4-digit duplex LCD car clock
PDF  20 Pages
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Hersteller  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

PCF1178CU Datenblatt(HTML) 4 Page - NXP Semiconductors

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1997 Apr 16
4
Philips Semiconductors
Product specification
4-digit duplex LCD car clock
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.
Fig.2 Segment designation of LCD.
MLB251
A2
G2
D2
F2
E2
B2
C2
COL
A3
G3
D3
F3
E3
B3
C3
A4
G4
D4
F4
E4
B4
C4
AM
PM
A1
G1
D1
E1
B1
C1
Fig.3 Typical displays.
a. 12-hour mode.
b. 24-hour mode.
PM
TIME
MSA993
(a)
MSA994
TIME
(b)
Fig.4 Backplane and output signals.
MSB226
VDD
VDD /2
0
BP1
VDD
VDD /2
0
BP2
VDD
0
SEGMENT
1
SEGMENT
2
ON
ON
VDD
0
OFF
ON
VDD
0
ON
OFF
VDD
0
OFF
OFF
15.625 ms



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