The INA169 is a “high-side current monitor,” which means that you place a resistor (a “shunt resistor”) on the positive power rail and the INA169 measures the voltage drop across that resistor. The INA169 outputs a small current based on the measured voltage drop. If you place a resistor from the output of the INA169 to ground, you can measure the voltage at the output.
Input common-mode and power supply voltages are independent and can range from 2.7V to 60V on the INA169 and quiescent (sleep) current is only 60uA.
IMPORTANT: The INA169 is configured to measure DC only. The VIN+ pin must be at a higher potential than the VIN- pin, which means that the INA169 cannot measure AC.
IMPORTANT: Be careful with the power rating on the resistor! If you choose a 0.1Ω resistor for RS and expect to see 3.5A through it, this can result in 1.2W of heat being generated – way too much for your average ¼W resistor! You will need a resistor that can handle at least 2W. The following power resistors are recommended:
- Ohmite 1Ω 1% 3W
- Ohmite 0.1Ω 1% 3W
With RL at 10kΩ, changing RS gives us the following ranges:
| RS | Current Sense Range |
| 10Ω | 3.5mA – 35mA |
| 1Ω | 35mA – 350mA |
| 0.1Ω | 350mA – 3.5A |
Features:
- Model – INA169
- Supply voltage – 3.3V, 5V(can be anywhere from 0 to 75V)
- VOUT range depends on the voltage supplied by VCC
- Current range of about 3.5mA to 35mA(for default setup)
Package Includes:
1 x SmartElex Current Sensor Breakout – INA169
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