INTEGRATED CIRCUITS
DATA SHEET
PCF1174C
4-digit static LCD car clock
Product specification
Supersedes data of September 1993
File under Integrated Circuits, IC16
1997 Apr 16
Philips Semiconductors
Product specification
4-digit static LCD car clock
FEATURES
•
Internal voltage regulator is electrically programmable
for various LCD voltages
•
Time calibration is electrically programmable
(no trimming capacitor required)
•
LCD voltage adjusts with temperature for good contrast
•
4.19 MHz oscillator
•
12-hour or 24-hour mode
•
Operating ambient temperature:
−40
to +85
°C
•
40-lead plastic SMD, face down (VSO40).
ORDERING INFORMATION
TYPE
NUMBER
PCF1174CT
PCF1174CU
Notes
1. See Fig.1 and Chapter “Package outline” for pin layout and package details.
2. See Chapter “Chip dimensions and bonding pad locations” for pad layout and package details.
PACKAGE
NAME
VSO40
−
uncased chip in tray
(2)
DESCRIPTION
plastic very small outline package; 40 leads; face down
(1)
GENERAL DESCRIPTION
PCF1174C
The PCF1174C is a single chip, 4.19 MHz CMOS car clock
circuit providing hours, minutes and seconds functions.
It is designed to drive a 4-digit static liquid crystal display
(LCD).
Two external single-pole, single-throw switches will
accomplish all time setting functions. Time calibration and
voltage regulator are electrically programmable via an
on-chip EEPROM. The circuit is battery-operated via an
internal voltage regulator and an external resistor.
VERSION
SOT158-2
−
1997 Apr 16
2
Philips Semiconductors
Product specification
4-digit static LCD car clock
PINNING
SYMBOL
BP
PM
AM
ADEG1
C1
E2
D2
C2
E3
C3
E4
D4
C4
B4
S1
DATA
OSC IN
OSC OUT
V
SS
MODE
V
PP
TS
ENABLE
V
DD
FLASH
SEL
S2
A4
F4
G4
B3
AD3
F3
G3
COL
B2
A2
F2
G2
B1
1997 Apr 16
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
DESCRIPTION
backplane output
segment driver
segment driver
segment driver
segment driver
segment driver
segment driver
segment driver
segment driver
segment driver
segment driver
segment driver
segment driver
segment driver
hour adjustment input
EEPROM data input
oscillator input
oscillator output
negative supply
12/24-hour mode select input
programming voltage input
test speed-up mode input
set enable input for S1 and S2
positive supply voltage
colon option input
EEPROM select input
minute adjustment input
segment driver
segment driver
segment driver
segment driver
segment driver
segment driver
segment driver
segment driver
segment driver
segment driver
segment driver
segment driver
segment driver
3
B4 14
S1 15
DATA 16
OSC IN 17
OSC OUT 18
VSS
19
D2
C2
E3
7
8
9
BP
PM
AM
ADEG1
C1
E2
1
2
3
4
5
6
PCF1174C
40 B1
39 G2
38 F2
37 A2
36 B2
35 COL
34 G3
33 F3
32 AD3
31 B3
C3 10
PCF1174CT
E4
11
30 G4
29 F4
28 A4
27 S2
26 SEL
25 FLASH
24 VDD
23 ENABLE
22 TS
21 VPP
MSA991
D4 12
C4 13
MODE 20
Fig.1 Pin configuration, PCF1174CT, (VSO40).
Philips Semiconductors
Product specification
4-digit static LCD car clock
FUNCTIONAL DESCRIPTION AND TESTING
Outputs
The circuit outputs static data to the LCD. Generation of
BP and the output signals are shown in Fig.4.
PCF1174C
The average voltages across the segments are:
1. V
ON(RMS)
= V
DD
2. V
OFF(RMS)
= 0 V.
A1
A2
A3
A4
AM
PM
B1 F2
G1
G2
B2
P1 (P3)
F3
G3
B3 F4
G4
B4
E1
C1 E2
C2
P2 (P4)
E3
C3 E4
C4
D1
D2
D3
D4
MSA992
Fig.2 Segment designation of LCD.
TIME
PM
MSA993
VDD
BP
0
(a)
a. 12-hour mode.
SEGMENT
VDD
OFF
0
VDD
TIME
ON
0
MSA994
15.625 ms
MSA996
(b)
b. 24-hour mode.
Fig.3 Typical displays.
Fig.4 Backplane and output signals.
1997 Apr 16
4
Philips Semiconductors
Product specification
4-digit static LCD car clock
LCD voltage
(see Fig.5)
The adjustable voltage regulator controls the supply
voltage (see Section “LCD voltage programming”) in
relation to temperature for good contrast, for example
when V
DD
= 4.5 V at +25
°C,
then:
V
DD
= 3 to 4 V at +85
°C.
V
DD
= 5 to 6 V at
−40 °C.
PCF1174C
−8
V SS
(V)
−6
(3)
(2)
−4
(1)
MSA995
−2
0
40
0
40
80
T ( o C)
120
(1) Programmed to 4.0 V at 25
°C
(value within the specified operating range).
(2) Programmed to 4.5 V at 25
°C
(value within the specified operating range).
(3) Programmed to 5.0 V at 25
°C
(value within the specified operating range).
Fig.5 Regulated voltage as a function of temperature (typical).
1997 Apr 16
5
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