PCF1174CT datasheet(7/20 Pages) PHILIPS

Part #	PCF1174CT

Description	4-digit static LCD car clock

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Manufacturer	PHILIPS [NXP Semiconductors]

Direct Link	http://www.nxp.com

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7 / 20 page

1997 Apr 16

7

Philips Semiconductors

Product speciﬁcation

4-digit static LCD car clock

PCF1174C

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 = 3.81 µs; SEL at VSS)

OSCILLATOR-FREQUENCY DEVIATION

∆f/f

(

× 10−6)

NUMBER OF PULSES

(n)

BACKPLANE PERIOD

(ms)

0

15.625

+3.8

1

15.629

+7.6

2

15.633

+11.4

3

15.636

..

.

..

.

..

.

+117.8

31

15.743

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PCF1174CT Datasheet(PDF) 7 Page - NXP Semiconductors

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