MCP111 Просмотр технического описания (PDF) - Microchip Technology

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MCP111

Micropower Voltage Detector

Microchip Technology 

4.0 APPLICATION INFORMATION

For many of today’s microcontroller applications, care

must be taken to prevent low-power conditions that can

cause many different system problems. The most

common causes are brown-out conditions, where the

system supply drops below the operating level momen-

tarily. The second most common cause is when a slowly

decaying power supply causes the microcontroller to

begin executing instructions without sufficient voltage to

sustain SRAM, thus producing indeterminate results.

Figure 4-1 shows a typical application circuit.

VDD

0.1

µF

3

VDD

MCP11X

VOUT 1

VSS

2

VDD

RPU

(1)

PICmicro®

Microcontroller

MCLR

(Reset Input)

GND

Note 1: RPU may be required with the MCP111

due to the open-drain output. Resistor

RPU is not required with the MCP112.

FIGURE 4-1:

Typical Application Circuit.

MCP111/112

4.1 VTRIP Operation

The voltage trip point (VTRIP) is determined on the falling

edge of VDD. The actual voltage trip point (VTRIPAC) will

be between the minimum trip point (VTRIPMIN) and the

maximum trip point (VTRIPMAX). There is a hysteresis on

this trip point to remove any “jitter” that would occur on

the VOUT pin when the device VDD is at the trip point.

Figure 4-2 shows the state of the VOUT pin as

determined by the VDD voltage. The VTRIP specification

is for falling VDD voltages. When the VDD voltage is

rising, the VOUT pin will not be driven high until VDD is at

VTRIP + VHYS.

VDD

VTRIPMAX

VTRIPMIN

1V

VTRIPAC + VHYSAC

VTRIPAC

VOUT

< 1 V is outside the

device specifications

FIGURE 4-2:

VOUT Operation as Determined by the VTRIP and VHYS.

VTRIPAC

© 2005 Microchip Technology Inc.

DS21889D-page 11

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