DIO221X

Version 1.1, Feb 2024

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© 2024 DIOO MICROCIRCUITS CO., LTD.

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9. Application Information

Important notice: Validation and testing are the most reliable ways to confirm system functionality. The

application information is not part of the specification and is for reference purposes only.

The DIO221X can detect overcurrent conditions and monitor current in an application through easy

configuration. Designers can use the device alone to detect the overcurrent of a single threshold or pair it

with other devices and circuitry to build more complex monitoring functional blocks.

9.1. Basic connections

To minimize the resistance in series with the shunt resistance, connect VIN+ and VIN– as close as possible

to the shunt resistor. Power-supply bypass capacitors can increase stability. To reject power supply noise in

applications with noisy or high-impedance power supplies, add decoupling capacitors. Connect bypass

capacitors close to the device pins (See Figure 8).

Figure 8. DIO221X basic connections

9.2. Choosing shunt resistor

The value for the shunt resistor or RSHUNT varies from application to application. The higher the RSHUNT

value is, the smaller the offset effects are. Likewise, the lower the value is, the smaller the supply voltage

loss is. Users should find a balance between maximum permissible voltage loss and the accuracy of small

input signals. Normally, RSHUNT with a range of 50 mV to 100 mV can help the application achieve the best

performance.