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PCF1175CT/F2,112

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
1997 Apr 16 7
Philips Semiconductors Product specification
4-digit duplex LCD car clock PCF1175C
The number (n) is stored in a non-volatile memory which is achieved by the following steps (see Fig.6):
1. Set SEL to V
SS
and a level of V
DD
− 5 V to V
PP
2. The quartz-frequency deviation ∆f/f is measured and (n) is calculated (see Table 1)
3. A first pulse t
E
is applied to the DATA input clears the EEPROM to give the highest backplane frequency
4. The calculated pulses (n) are entered in (t
H
, t
L
). If the maximum backplane period is reached and an additional pulse
is applied the period will return to the lowest value.
5. The backplane period is controlled and when correct fixed by applying the store pulse t
W
6. Release SEL and V
PP
.
Table 1 Time calibration (∆t = 7.63 µs; SEL at V
SS
)
OSCILLATOR-FREQUENCY DEVIATION
∆f/f
(× 10
−6
)
NUMBER OF PULSES
(n)
BACKPLANE PERIOD
(ms)
0 0 15.625
+3.8 1 15.633
+7.6 2 15.641
+11.4 3 15.648
...
...
...
+117.8 31 15.861
1997 Apr 16 8
Philips Semiconductors Product specification
4-digit duplex LCD car clock PCF1175C
Fig.6 Programming diagram.
MSB223
PCF1175C
SEL
V
DD
OSC OUT
OSC IN
V
SS
12 V
R
6.8 kΩ
C 47 µF
ext
V
SS
DATA
V
PP
pulse
generators
0 V
t , t = 4 to 6 ms
WE
t = 1 µs
H
t = 1 to 1.5 µs
L
t
E
t
H
t
L
t
H
t
L
V
DD
t
H
t
W
n
clears cells incrementing counters store pulse
5 VV
DD
DATA
V
PP
V
DD
5 VV
DD
50 µs
50 µs
50 µs
50 µs
1997 Apr 16 9
Philips Semiconductors Product specification
4-digit duplex LCD car clock PCF1175C
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
Note
1. Connecting the supply voltage with reverse polarity, will not harm the circuit, provided the current is limited to 10 mA
by an external resistor.
HANDLING
Inputs and outputs are protected against electrostatic discharges in normal handling. However, to be totally safe, it is
advisable to take handling precautions appropriate to handling MOS devices. Advice can be found in
“Data Handbook IC16, General, Handling MOS Devices”
.
SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT
V
DD
supply voltage with respect to V
SS
− 8V
I
DD
supply current V
SS
= 0 V; note 1 − 3mA
V
I
input voltage all pins except V
PP
and DATA −0.3 V
DD
+ 0.3 V
pins V
PP
and DATA −3V
DD
+ 0.3 V
T
amb
operating ambient temperature −40 +85 °C
T
stg
storage temperature −55 +125 °C
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

PCF1175CT/F2,112

Mfr. #:
Buy PCF1175CT/F2,112
Manufacturer:
NXP Semiconductors
Description:
Clock Drivers & Distribution 4 DIG DUPLX LCD CLCK
Lifecycle:
New from this manufacturer.
Delivery:
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