NCP302 ON, NCP302 Datasheet - Page 20

• Manufacturer Part Number: NCP302
• Description: Voltage Detector Series with Programmable Delay
• Manufacturer: ON

R
sense
A simple voltage monitor can be constructed by connecting several voltage detectors as shown above. Each LED will
sequentially turn on when the respective voltage detector threshold (V
thresholds (V
C
5
D
V
in
= 1.0 V to 10 V
LSN27T1
LSN27T1
LSN09T1
NCP301
NCP301
NCP303
V
2
3
supply
DET−
Load
Input
GND
) that range from 0.9 V to 4.9 V in 100 mV steps can be manufactured.
1
Reset Output
Figure 43. Microcontroller Systems Load Sensing
Figure 44. LED Bar Graph Voltage Monitor
50 k
C
C
C
5
5
5
D
D
D
Microcontroller
NCP302, NCP303
http://onsemi.com
V
LSN27T1
LSN27T1
LSN45T1
LSN27T1
LSN27T1
LSN27T1
LSN27T1
LSN27T1
LSN18T1
DD
NCP301
NCP301
NCP303
NCP301
NCP301
NCP303
NCP301
NCP301
NCP303
3
3
3
2
2
2
GND
Input
GND
Input
GND
Input
GND
20
Output
Output
Output
Reset
Reset
Reset
1
1
1
This circuit monitors the current at the load. As
current flows through the load, a voltage drop with
respect to ground appears across R
V
If:
I
I
DET−
Load
Load
sense
t V
w (V
+V
= I
HYS
DET −
load
DET −
) is exceeded. Note that detector
* R
/R
+V
sense.
sense
HYS
V
supply
)/R
The following conditions apply:
sense
Then:
Reset Output = 0 V
Reset Output = V
sense
where
DD