Rainbow-electronics DS1846 Manuel d'utilisateur télécharger pdf (Page 9)

DS1846

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When the supply being monitored decays to the voltage sense point, the DS1846 pulses the NMI output

to the active state for a minimum 200 s. The NMI power-fail detection circuitry also has built-in

hysteresis of 100 V. The supply must be below the voltage sense point for approximately 5 s before a

low NMI will be generated. In this way, power supply noise is removed from the monitoring function,

preventing false interrupts. During a power-up, any detected IN pin levels below V

by the comparator

are disabled from generating an interrupt until V

rises to V

CCTP

. As a result, any potential NMI pulse

will not be initiated until V

reaches V

CCTP

Connecting NMI to PBRST would allow the non-maskable interrupt to generate an automatic reset when

an out-of-tolerance condition occurred in a monitored supply. An example is shown in Figure 5.

2- Wire Protocol Data Transfer Protocol Figure 2

2-Wire AC CHARACTERISTICS Figure 3

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Rainbow-electronics DS1846 Manuel d'utilisateur Page 9