Rainbow-electronics DS1682 Manual do Utilizador descarregar pdf (Página 14)

DS1682

14 of 15

Figure 8. TOTAL RUN TIME

Figure 8 shows the DS1682 measuring total run time and operating from a battery with the alarm tied to

an LED and a pushbutton switch to trigger the alarm output.

Figure 9. TOTAL TIME-OF-USE APPLICATION WITH FAST V

SLEW RATE

Figure 9 shows the DS1682 in a total time-of-use application where power may be removed at the same

time as the end of the event. The V

slew rate at power-down is fast with respect to t

. A capacitor

maintains V

on the DS1682 above 2.5V until the EEPROM write completes. A Schottky diode blocks

current from the capacitor to other devices connected to V

The V

holding capacitor value of 30µF is calculated using the maximum EEPROM write current and

EEPROM write time. This assumes that the V

slew rate allows time from EVENT trip point to V

2.5V on the DS1682 is at least t

EW.

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Rainbow-electronics DS1682 Manual do Utilizador Página 14