MC33464 Просмотр технического описания (PDF) - ON Semiconductor

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MC33464

MICROPOWER UNDERVOLTAGE SENSING CIRCUITS

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MC33464

Figure 7. Microprocessor Reset Circuit with Delay

2 Input

Vin

Vref

1

Reset

470 k

CDelay

3 Gnd

Microprocessor

A time delayed reset can be accomplished with the addition of CDelay. Figure 5 provides a graph of time delays, for both rising

and falling output waveform edges, as a function of CDelay. If another value of pullup resistance is used, the time delay can be

calculated by using the equation:

ȧȧȧȱȲǒ Ǔȳȴȧȧȧ + tDelay R CDelay

1

1

–

Vth(MPU)

Vin

) tp

where VthMPU is the microprocessor reset input threshold voltage and tp is the propagation delay internal to the MC33464.

Figure 8. Microprocessor Reset Circuit

2 Input

Vin

Vref

1

Reset

3 Gnd

Microprocessor

MOTOROLA ANALOG IC DEVICE DATA

5

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