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TMCS1101: IIN LINEAR MEASUREMENT RANGE of TMCS1101A4B

Conor
Mastermind 9350 points
Part Number: TMCS1101
Other Parts Discussed in Thread: TMCS1133, TMCS1126, TMCS1123

Hi, 

Q1.
There is no information regarding "IIN LINEAR MEASUREMENT RANGE" of TMCS1101A4B. Please tell me the range when Vs=3.3V.

Q2.
I am considering monitoring the current of 0~15A at VCC: 3.3V. Are there any suitable devices including TMCS1101?
The purpose of use is to monitor the 12V DC output line, so insulation is not essential, but it would be nice to have it.

Thanks,

Conor

  • 0
    TI__Mastermind 20935 points

    Hello Conor,

    Here are my responses to your questions:

    Q1.

    The range is not specified at 3.3V for the TMCS1101A4 device because that version can only be powered up in the 5V range:

    Q2.

    Although the TMCS1101 would work for this setup, it is important to note that this device does not have a differential measurement, and is therefore more subject to external magnetic filed. Here is an app note for best practices when using this device: https://www.ti.com/lit/pdf/sboa518. 

    You may be interested in our newer line of Hall based current sensors that have a differential measurement to improve accuracy and ease of use (along with some other features and reinforced isolation). These devices include the TMCS1123, TMCS1126, and TMCS1133. 

    If you decide that you do not need/want isolation, then we have many shunt based current sensors that you can pick from. Here is a complete list of devices with a filtering tool to help you narrow down what you would want: https://www.ti.com/amplifier-circuit/current-sense/products.html. We have both analog out and digital out devices based on what works better for you. We even have both analog and digital devices that have an integrated shunt resistor (most notably the newer INA7xx series of devices).

    Let me know if you have any further questions or need more help narrowing down a device to use.

    Regards,
    Mitch