NCP304 ON, NCP304 Datasheet - Page 18

• Manufacturer Part Number: NCP304
• Description: Voltage Detector Series
• 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
V
in
= 1.0 V to 10 V
LSQ09T1
LSN27T1
LSN27T1
NCP301
NCP301
NCP305
V
2
3
DET−
supply
Load
Input
GND
) that range from 0.9 V to 4.9 V in 100 mV steps can be manufactured.
1
Reset Output
Figure 31. Microcontroller Systems Load Sensing
50 k
Figure 32. LED Bar Graph
Microcontroller
NCP304, NCP305
http://onsemi.com
V
LSN27T1
LSN27T1
LSQ45T1
LSN27T1
LSN27T1
LSQ27T1
LSN27T1
LSN27T1
LSQ18T1
NCP301
NCP301
NCP305
NCP301
NCP301
NCP305
NCP301
NCP301
NCP305
DD
3
3
3
2
2
2
GND
Input
GND
Input
GND
Input
GND
18
Output
Output
Output
Reset
Reset
Reset
1
1
1
DET−
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
Load
Load
sense
+V
t V
w (V
HYS
= I
DET −
load
) is exceeded. Note that detector
DET −
* R
/R
+V
V
sense.
sense
supply
HYS
)/R
The following conditions apply:
sense
Then:
Reset Output = 0 V
Reset Output = V
sense
where
DD