DIO2240

Version 1.2, Jan 2026

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© 2026 Dioo Microcircuits Co., Ltd. Jiangsu

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9.3.3. Reference pin connections for bidirectional current measurements

For bidirectional operation, the current measurements is conducted through a resistive shunt in two

directions. In this operation, the output voltage can be set anywhere within the reference input limits.

Commonly, set the reference inputs at half-scale for equal range in both directions. However, if the

bidirectional current is non-symmetrical, the reference inputs can be set to a voltage other than half-scale.

In the condition of shorted input pins or a 0 V differential input, connect both reference pins together and

then to a reference voltage, which results in an output voltage equal to the reference voltage (see Figure

14). If the IN+ pin is negative relative to the IN– pin, the output voltage drops below the reference voltage;

when if IN+ pin is positive relative to the IN– pin, the output voltage increases. This is the most accurate

way to bias the output to a precise voltage.

Figure 14. External reference output

In the condition of no differential input, connect one reference pin to VS and the other to the GND pin, which

sets an output at half of the supply (see Figure 15). It creates a ratiometric offset to the supply voltage,

where the output voltage remains at VS / 2 for 0 V applied to the inputs.

Figure 15. Midsupply voltage output

For output set to mid-external reference, an external reference is divided by two through connecting one

reference pin to ground and the other reference pin to the reference (see Figure 16).