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- Current Sense Shunt
- ===================
- When an io-channel measures the voltage over a current sense shunt,
- the interesting measurement is almost always the current through the
- shunt, not the voltage over it. This binding describes such a current
- sense circuit.
- Required properties:
- - compatible : "current-sense-shunt"
- - io-channels : Channel node of a voltage io-channel.
- - shunt-resistor-micro-ohms : The shunt resistance in microohms.
- Example:
- The system current is measured by measuring the voltage over a
- 3.3 ohms shunt resistor.
- sysi {
- compatible = "current-sense-shunt";
- io-channels = <&tiadc 0>;
- /* Divide the voltage by 3300000/1000000 (or 3.3) for the current. */
- shunt-resistor-micro-ohms = <3300000>;
- };
- &i2c {
- tiadc: adc@48 {
- compatible = "ti,ads1015";
- reg = <0x48>;
- #io-channel-cells = <1>;
- #address-cells = <1>;
- #size-cells = <0>;
- channel@0 { /* IN0,IN1 differential */
- reg = <0>;
- ti,gain = <1>;
- ti,datarate = <4>;
- };
- };
- };
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