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PCF1175CT Datasheet(PDF) 4 Page - NXP Semiconductors

Part # PCF1175CT
Description  4-digit duplex LCD car clock
PDF  20 Pages
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

PCF1175CT Datasheet(HTML) 4 Page - NXP Semiconductors

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1997 Apr 16
4
Philips Semiconductors
Product specification
4-digit duplex LCD car clock
PCF1175C
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.
MSA992
A2
G2
D2
F2
E2
B2
C2
P1 (P3)
P2 (P4)
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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