pcf1174c NXP Semiconductors, pcf1174c Datasheet - Page 7

• Manufacturer Part Number: pcf1174c
• Description: 4-digit Static Lcd Car Clock
• Manufacturer: NXP Semiconductors

Philips Semiconductors
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
2. The quartz-frequency deviation f/f is measured and (n) is calculated (see Table 1)
3. A first pulse t
4. The calculated pulses (n) are entered in (t
5. The backplane period is controlled and (when correct) fixed by applying the store pulse t
6. Release SEL and V
Table 1 Time calibration ( t = 3.81 s; SEL at V
1997 Apr 16
OSCILLATOR-FREQUENCY DEVIATION
4-digit static LCD car clock
is applied the period will return to the lowest value.
SS
E
is applied to the DATA input clears the EEPROM to give the highest backplane frequency
( 10
+117.8
and a level of V
+11.4
+3.8
+7.6
0
f/f
.
.
.
PP
6
.
)
DD
5 V to V
H
, t
L
PP
). If the maximum backplane period is reached and an additional pulse
SS
)
NUMBER OF PULSES
7
(n)
31
0
1
2
3
.
.
.
BACKPLANE PERIOD
W
15.625
15.629
15.633
15.636
15.743
Product specification
(ms)
PCF1174C
.
.
.