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I am completely new to electronics and I am looking to implement a simple 12V Vacuum Pump power and control circuit with an Arduino.

I chose the MIC29301 as the 12Vout regulator to be directly connected with a 12V lifePo 4 battery. The diagram is attached below:

12V regulator

The GND, IN, and Out were pretty straightforward. However, I am trying to be careful with the Enable and Flag pins as I don't know a lot about them.

My question is how do I connect the enable pins with an Arduino to use it as an on/off logic switch (i.e if resistors are required or it can be connected directly)

My other question is about the Error Flag pin which I am completely new to. I am trying to use this pin to read for drop in output voltage from the regulator, but I am completely lost on how to use this pin or connect it with the Arduino. Please I would love some guidance and explanations on how and why some of the recommendations will work. Thank you.

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  • \$\begingroup\$ Have you looked at the MIC29301 datasheet? There is a lot of information there including typical application circuits. \$\endgroup\$
    – jwh20
    Commented Apr 7, 2021 at 1:23
  • \$\begingroup\$ Yes, I did, and while there is a lot of information, there is barely any useful one on the flag pins and enable pins, at least for my level of knowledge. \$\endgroup\$
    – orhema oluga
    Commented Apr 7, 2021 at 1:55

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Always refer to datasheets for the information you are looking for.

From the datasheet:

On the MIC29xx1 and MIC29xx2, the ENABLE pin may be tied to VIN if it is not required for ON/OFF control.

CMOS compatible control input. Logic-high = enable, logic-low = shutdown.

MIC29xx1 and MIC29xx2 versions feature an enable (EN) input that allows ON/OFF control of the device. The EN input has TTL/CMOS compatible thresholds for simple interfacing with logic, or may be directly tied to ≤30V

So, you can control the ENABLE pin using digital output of Arduino directly.

Also from the datasheet:

Active-low error flag output signal that indicates an output fault condition.

Error Flag, which looks at the output voltage and signals an error condition when this voltage drops 5% below its expected value. The error flag is an open-collector output that pulls low under fault conditions. It may sink 10 mA.

Since FLAG is an open collector output, you have to put an appropriate pull-up resistor. You can then read the FLAG pin using digital input of Arduino.

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  • \$\begingroup\$ Thank you for your response. As I stated, I am new to this and datasheets still takes time to get used to. As per your advice on the flag pin, do you mean I put an appropriate pull-up resistor to the digital pin of the Arduino, or to the output pin of the regulator? \$\endgroup\$
    – orhema oluga
    Commented Apr 12, 2021 at 21:16
  • \$\begingroup\$ Both are the same thing. You connect output flag pin to the input of Arduino. Put pull-up on this connection. \$\endgroup\$
    – Mitu Raj
    Commented Apr 12, 2021 at 21:45
  • \$\begingroup\$ Kindly accept an answer as solution if it solved your problem, so that it helps others in future. \$\endgroup\$
    – Mitu Raj
    Commented Apr 17, 2021 at 19:04
  • \$\begingroup\$ I just accepted it as the answer, sorry I am new to the Stackexchange system. Also, please for the pull-up resistor, is there anything, in particular, I should be taking into consideration with regards to the resistor value? \$\endgroup\$
    – orhema oluga
    Commented Apr 19, 2021 at 18:27
  • \$\begingroup\$ Yes, as said in the datasheet, the resistor should limit the sinking current to 10 mA. \$\endgroup\$
    – Mitu Raj
    Commented Apr 19, 2021 at 18:31

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