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參數(shù)資料
| 型號： | 935182630005 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 時鐘及定時 |
| 英文描述： | LCD CLOCK, UUC28 |
| 封裝： | DIE-28 |
| 文件頁數(shù)： | 20/22頁 |
| 文件大?。?/td> | 153K |
| 代理商： | 935182630005 |
1997 Apr 16
7
Philips Semiconductors
Product specication
4-digit duplex LCD car clock
PCF1178C
The number (n) is stored in a non-volatile memory which is achieved by the following steps (see Fig.6):
1. Set SEL to VSS and a level of VDD 5 V to VPP
2. The quartz-frequency deviation
f/f is measured and (n) is calculated (see Table 1)
3. A first pulse tE is applied to the DATA input clears the EEPROM to give the highest backplane frequency
4. The calculated pulses (n) are entered in (tH, tL). 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 tW
6. Release SEL and VPP.
Table 1
Time calibration (
t = 7.63 s; SEL at VSS)
OSCILLATOR-FREQUENCY DEVIATION
f/f
(
× 106)
NUMBER OF PULSES
(n)
BACKPLANE PERIOD
(ms)
0
15.625
+3.8
1
15.633
+7.6
2
15.641
+11.4
3
15.648
..
.
..
.
..
.
+117.8
31
15.861
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