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[FAQ] Current Sensors and Power Monitors FAQ Links

Many postings in the E2E Forum can be designated as a Frequently Asked Question or FAQ. In order for you to quickly create a system and implement a current and power sensing solution here is a curation of links to these FAQ postings. As time goes on more public postings can be designated as a FAQ and thus may not be listed here, but can be searched in this forum.

Device specifications:

What are the input bias current and input impedance specifications for bus voltage monitors?

How do I know the output swing of current sense amplifiers or OPAs in general?

Bandwidth considerations for measuring PWM signals specifically with INA240.

Device protection:

Why can I exceed the absolute maximum voltage rating if I limit the input current?

What are some ways to protect a current sensor and prevent its input voltage from exceeding -0.3V absolute max rating?

Considerations for adding TVS protection diodes

 

System level considerations:

Choosing pull-up resistor for an I2C bus.

What are power sequencing considerations for current sense amplifiers?

What is the closed-loop output impedance (ZOUT) of a current sensor and how can I compensate this output for capacitive load stability?

 

Error analysis:

How do external resistors on a reference pin affect CMRR and gain error for current sense amplifiers?

What are the critical error sources for measuring small current levels?

 

Device-specific considerations:

What are other ways of using high-side current sensors such as INA3221 and INA219?

How to use the power accumulator in current sensing, specifically for the INA233

Measuring 20mV Vsense with INA193, INA194, INA195, INA196, INA197, INA198, INA270, or INA271

Can the internal-shunt INA250 be used in-line with a PWM signal?

User’s Guide for INA250EVM with just one A2 device

Explaining the datasheet plots for INA199 and its A1, A2, and A3 versions.

Difference between INA199A, INA199B, and INA199C devices

Difference between INA21xA, INA21xB, and INA21xC devices

 

PCB Layout:

Layout recommendations for internal shunt current sensing using devices such as INA250 or INA260

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