SCY99091FCT2G Datasheet, PDF(19/26 Page) ON Semiconductor – Voltage Detector Series with Programmable Delay

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SCY99091FCT2G Datasheet, PDF (19/26 Pages) ON Semiconductor – Voltage Detector Series with Programmable Delay

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NCP302, NCP303

Vsupply

Load

VDD

Rsense

2 Input

NCP3013

LSN2079T1

50 k

Reset Output

Microcontroller

3 GND

GND

This circuit monitors the current at the load. As

current flows through the load, a voltage drop with

respect to ground appears across Rsense where

Vsense = Iload * Rsense. The following conditions apply:

If:

ILoad t VDET â /Rsense

ILoad w (VDET â+VHYS)/Rsense

Then:

Reset Output = 0 V

Reset Output = VDD

Figure 43. Microcontroller Systems Load Sensing

2 Input

NCP3013

LSN2475T1

Reset

Output

3 GND

Vsupply

Vin = 1.0 V to 10 V

2 Input

NCP3013

LSN27T1

Reset

Output

3 GND

2 Input

NCP3013

LSN2178T1

Reset

Output

3 GND

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 (VDETâ +VHYS) is exceeded. Note that detector

thresholds (VDETâ) that range from 0.9 V to 4.9 V in 100 mV steps can be manufactured.

Figure 44. LED Bar Graph Voltage Monitor

http://onsemi.com

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