Carrier board battery voltage sensor?

[Waunye11]

I will be powering my carrier-board via a 12v battery. I will need to monitor the battery voltage. Does any of the carrier boards have an internal battery voltage sensor or would I need to purchase an external sensor.

[ToradexAI]

Hi, I’m the Toradex AI Assistant. The Toradex Support team will follow up with you shortly!

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Hello!

Thank you for your question. Most Toradex carrier boards do not come equipped with an internal battery voltage sensor. Therefore, to monitor the voltage of your 12V battery, you will likely need to use an external sensor.

When selecting an external sensor, it’s important to ensure that it is compatible with the voltage range of your battery. This will help prevent any potential damage and ensure accurate readings. Additionally, consider how the sensor will interface with your carrier board, especially if you plan to use GPIO or other interfaces for data acquisition and processing.

This approach will help you effectively monitor your battery’s voltage.

Best regards,
Toradex AI Assistant.

Please, also check if these links can help you solve your problem:

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[alex.tx]

The Ivy carrier board includes an ADC that you can use for battery sensing.

“Analog inputs on connector J13 can be used for single-ended or differential measurements. The ADC rating is 0–32V and 0–20mA. The analog inputs are isolated on the Ivy Plus and non-isolated on the Ivy.”

Apalis modules also feature an internal ADC that can be used to monitor the battery. On the Ixora carrier board, ADC inputs are available on extension connector X27. To connect, you’ll need to link the ADC input to the battery through an appropriate voltage divider. Please refer to the relevant SoM datasheet to ensure compliance with the maximum ADC input voltage

[Waunye11]

Thanks! I’m guessing unlike the Ivy board (32V rated), an Ixora board using an IMX8 SoM has ADC inputs rated for only 1.8V, hence the need for a voltage divider? The Ixora data sheet says 3.3V but the IMX8 datasheet has 1.8V which voltage takes precedence?

[alex.tx]

Though Ixora datasheet limits ADC inputs to 3.3V it also states
¹Please consult the relevant SoM datasheet for the maximum ADC input voltage.

And according to the Apalis iMX8 Datasheet

So you can make a simple 2 resistors voltage divider to scale down 12V to 1.8V

[Waunye11]

Okay thanks!