Power-Supply Monitor with Reset

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5

Figure 1. MAX700 Block Diagram

RESET

1MΩ

1.29V REF

OSC

RC

R

R

COMPARATOR

RESET

GND

1

2

8

7

CTL

SENSE

HYST

150kΩ

MR

3

4

6

5

MAX700

GND

1

2

8

7

SENSE

MANUAL

RESET

BUTTON

HYST

MR

3

4

6

N.C.

N.C.

TO µP

+5V

5

MAX700

RESET

RESET

CTL

GND

1

2

8

7

SENSE

MANUAL

RESET

BUTTON

HYST

MR

3

4

6

N.C.

R1

R3

R2

TO µP

R1 = R2

(

- 1

)

1.29

R3 =

5

MAX700

RESET

RESET

CTL

RESET

0V

0V

2V/div

2V/div

1s/div

Figure 2. MAX700 Typical Connection Diagram

Figure 3. MAX700 Connected for External Senses and

Hysteresis

Figure 4 shows the RESET output of the MAX700/

down to 0V. Note the effect of the built-in hysteresis on

the trigger lever of RESET.

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