INA181: Vref Supplied by ATTiny 1-Series DAC?

Kent Schafer

Part Number: INA181
Other Parts Discussed in Thread: TPS61022

Hello,

I would like to use the INA181 current sense amplifier for my project. Currently intend to hook up an ATTiny 1-series micro, and use the DAC module to directly supply the Vref as a dimming method. Have copied the PMP4640 schematic for the most part, and followed the datasheet as best I can. The DAC module is a buffered resistor divider per Atmel data sheet, and it is supposed to supply up to 1ma current into a 5k ohm minimum load.

The Vout will be going to the feedback pin of a TPS61022 boost converter. The project supply will be using two nimh cells.

Would it be possible to pass on a pic of the board design for a board review if possible too. Thanks.

Regards,

Kent

over 3 years ago

0 Peter Iliya over 3 years ago

TI__Mastermind 26750 points

Hey Kent,

Thanks for posting to the forum. The DAC you have described will work to drive the REF pin of INA181. You can post the design here or message me directly. Although I recommend asking for a review from the Power Management team here: https://e2e.ti.com/support/power-management/f/196#pi321300=1

Sincerely,

Peter

0 Kent Schafer over 3 years ago in reply to Peter Iliya

Prodigy 90 points

Thank you Peter for your prompt reply, I know some micro's don't have a buffered DAC output, so good to know.

Kent

Amplifiers

Amplifiers forum

INA181: Vref Supplied by ATTiny 1-Series DAC?