參數(shù)資料
型號: PCF1179
廠商: NXP Semiconductors N.V.
英文描述: 4-digit duplex LCD car clock
中文描述: 4位全雙工液晶車鐘
文件頁數(shù): 7/20頁
文件大?。?/td> 133K
代理商: PCF1179
1997 Apr 16
7
Philips Semiconductors
Product specification
4-digit duplex LCD car clock
PCF1179C
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
μ
s; SEL at V
SS
)
OSCILLATOR-FREQUENCY DEVIATION
f/f
(
×
10
6
)
0
+3.8
+7.6
+11.4
.
.
.
+117.8
NUMBER OF PULSES
(n)
BACKPLANE PERIOD
(ms)
0
1
2
3
.
.
.
15.625
15.633
15.641
15.648
.
.
.
15.861
31
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參數(shù)描述
PCF1179C 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:4-digit duplex LCD car clock
PCF1179CT 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:4-digit duplex LCD car clock
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