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4 votes
3 answers
451 views

Sensing current down to tens of nA with INA828 or other OPA

I need to measure the current draw of DUT that can be an MCU in deep sleep, such as Attiny85, or a more power hungry MCU that is powered off by TPL5110. In this post, I proposed a circuit where an ...
spanito's user avatar
  • 71
0 votes
2 answers
108 views

INA828 for sensing current down to tens of nA

I need to measure the voltage drop across a test resistor in order to sense the current flowing through it. This test resistor has a value of 1 MOhm and it's connected between the positive voltage of ...
spanito's user avatar
  • 71
1 vote
2 answers
97 views

Is amplification needed for high-side current sensing?

I have a 5 V system and I want to monitor the current in different parts of the system. I am planning to place a small value resistor on the positive power rail and feed the rail voltage and the ...
HV16's user avatar
  • 377
0 votes
0 answers
171 views

Current Sensing Trace Routing

I'm developing a motor control board (sensorless FOC). I have a question about the differential pair traces, they are very long (the longest is about 80 mm) and crosses several gate lines. How bad is ...
Daniel Müller's user avatar
0 votes
2 answers
190 views

Voltage divider dropping voltage more than expected

I'm trying to connect an ACS712 current sensor to an ESP32 ADC pin. The ESP32 expects 3.3 V, but the ACS712 can reach 4.5 V. When there's no current going through the ACS712, its signal is 2.5 V, so I ...
Lem0n's user avatar
  • 103
0 votes
0 answers
139 views

Designing high bandwidth current sensors for inductor current sensing

I am designing a high-frequency current sensor, suitable for sensing +/- 20 Amps at frequencies of 200kHz. This is being used in average current mode control application in an isolated forward ...
darthMaul's user avatar
1 vote
2 answers
196 views

AC phase current sensing using Isolated delta-sigma modulator

I am trying to design a isolated AC current sensor. I've chosen the AMC1106 Isolated Delta-Sigma Modulator. (change my mind if you think there is a better solution for 220V AC; 2A Max; 0.25%) The ...
JacobV's user avatar
  • 171
1 vote
1 answer
56 views

XADC Current Sensing Reference Design

Please refer to this reference design for AC701 (snippet below). The schematics, specifically the current sensing sections in pages 34-36, show this: I want to understand why, for the REF output of ...
seeker's user avatar
  • 121
1 vote
1 answer
99 views

Current sensing application

The purpose of the application is to maintain a constant current at the load, even if the resistance changes. I understand that the ADC is reporting the voltage and current values at the load to the ...
Zach Stow's user avatar