| 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>; |
| }; |
| }; |
| }; |
