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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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PCF1178CU/5 데이터시트(PDF) 7 Page - NXP Semiconductors |
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PCF1178CU/5 데이터시트(HTML) 7 Page - NXP Semiconductors |
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7 / 20 page  1997 Apr 16 7 Philips Semiconductors Product specification 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 µs; SEL at VSS) 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 |
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