Datasheet

470k:
V
SUPPLY
V
DD
R
SENSE
2
INPUT
3
GND
RESET OUTPUT
MICROCONTROLLER
GND
V
DET-
= 2.0V
THIS CIRCUIT MONITORS THE CURRENT AT THE LOAD. AS CURRENT FLOW
THROUGH THE LOAD, A VOLTAGE DROP WITH RESPECT TO GROUND
APPEARS ACROSS R
SENSE
WHERE V
SENSE
= I
LOAD
* R
SENSE
. THE
FOLLOWING CONDITIONS APPLY:
IF:
I
LOAD
< V
DET-
/R
SENSE
I
LOAD
t(V
DET-
+V
HYS
)/R
SENSE
THEN:
RESET OUTPUT = V
DD
1
RESET OUTPUT = 0V
V
DET-
= 4.5V
V
DET-
= 3.0V
V
SUPPLY
RESET OUTPUT
RESET OUTPUT
5.0V
3.3V
1
1
2 INPUT
2 INPUT
3 GND
3 GND
GND GND
V
IN
V
CC
PP
INPUT
RESET
RESET
470k:
LM8364
SNVS232B –MARCH 2003–REVISED APRIL 2013 www.ti.com
Typical Applications
Figure 9. Microprocessor Reset Circuit Figure 10. Dual Power Supply Undervoltage
Supervision
Figure 11. Microcontroller System Load Sensing
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