Looking for a shunt monitor

Other Hardware General Electronics
1

I'm doing a project where I need to measure current up to 100A.
For this I'm using a 75mV Shunt on the high side of the circuit (automotive --> 12.6v-14.7v).

Using a voltmeter I can measure the voltage around the shunt, I'm getting around 13mV at around 20A load.

I'm looking for a shunt monitor similar to AD8215 which can measure the differential voltage and output voltage I can measure with the ESP32.

Problem is, I can't find this IC at AliExpress, which is the where I shop.

What other ICs can I use?

2

You can use INA240. It is suitable for high-current measurements.

3

You can use ADS1115 for this, I2C device. Set the gain to max, ±256mV, differential input. ADS1115 is available "everywhere".

4

Thanks but I'm looking for a voltage output device and not I2C.

5

I'm a bit worried about the 50V/V gain.
Does this mean 75mV will be amplified to 3.75V? (more than what the ESP32 can handle)

6

Of course.

7

Chat GPT suggested the following for ICs with gain of 20:

  1. AD8215 (Analog Devices)
  • Fixed gain of 20.
  • High voltage (up to 65V common-mode).
  • High precision, commonly used for automotive and industrial applications.
  1. INA240A2 (Texas Instruments)
  • Gain: 20 V/V (A2 variant).
  • Enhanced PWM rejection, ideal for motor control and switching environments.
  • Bidirectional current sensing.
  1. INA213A (Texas Instruments)
  • Fixed gain of 20.
  • Compact, low-power device with high accuracy and wide input voltage range.
  1. MAX4080TAUA (Maxim Integrated)
  • Gain: 20 V/V for specific part numbers like MAX4080TAUA.
  • High-side, precision current-sense amplifier.
  1. ZXCT199 (Diodes Incorporated)
  • Fixed gain of 20.
  • High-side current monitor with low cost and good accuracy.
8

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