10μA-10mA Low-Side Current Sensor
This single-supply, low-side, current-sensing solution accurately detects load current between 10μΑ and 10mA. A unique yet simple gain-switching network was implemented to measure the three-decade load current range accurately. The linear range of the output is from 100mV to 4.90V. INA326 instrumentation amplifier is used since low-side sensing is desirable because the common-mode voltage is near the ground. Therefore, the current sensing solution is independent of bus voltage, which allows for using single-supply, rail-to-rail input/output (RRIO) amplifiers. Low-side current sensing places a shunt resistor between the system load and the ground. The current drawn by the load generates a voltage across the shunt resistor. The output voltage of the circuit is equal to the current sense across the shunt resistor and the gain of the amplifier. A high-value resistor is used as a shunt for accurate current sense. It is advisable to use 0.1% tolerance shunt resistor R2.
Credits: Circuit is from Texas Instruments Application Note
Features
- Supply 5V DC
- Input Current Range 10uA to 10mA
- Output 100mV(0,1V) to 4.90V
- On Board Power LED
- Very Small Board
- PCB Dimensions 28.10 x 17.30 mm
Connections
- CN1L Pin 1 = VCC 5V DC, Pin 2 = GND, Pin 3 = GND, Pin 4 = Output 100mV to 5V
- CN2: Pin 1 = Current Input, Pin 2 = GND
- D1: Power LED
- J1: Gain Set
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This single-supply, low-side, current-sensing solution accurately detects load current between 10μΑ and 10mA. A unique yet simple gain-switching network was implemented to measure the three-decade load current range accurately. The linear range of the output is from 100mV to 4.90V. INA326 instrumentation amplifier is used since low-side sensing is desirable because the common-mode voltage is near the ground. Therefore, the current sensing solution is independent of bus voltage, which allows for using single-supply, rail-to-rail input/output (RRIO) amplifiers. Low-side current sensing places a shunt resistor between the system load and the ground. The current drawn by the load generates a voltage across the shunt resistor. The output voltage of the circuit is equal to the current sense across the shunt resistor and the gain of the amplifier. A high-value resistor is used as a shunt for accurate current sense. It is advisable to use 0.1% tolerance shunt resistor R2.
Credits: Circuit is from Texas Instruments Application Note
Features
- Supply 5V DC
- Input Current Range 10uA to 10mA
- Output 100mV(0,1V) to 4.90V
- On Board Power LED
- Very Small Board
- PCB Dimensions 28.10 x 17.30 mm
Connections
- CN1L Pin 1 = VCC 5V DC, Pin 2 = GND, Pin 3 = GND, Pin 4 = Output 100mV to 5V
- CN2: Pin 1 = Current Input, Pin 2 = GND
- D1: Power LED
- J1: Gain Set
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