CR2032 tester

CR2032 tester

I was able to release a small breakout board based on a sample I received long ago from Texas Instruments. It is a CR2032 tester, based on the pretty accurate TPS3809L30DBVR part (which was derived from eevblog’s ĀµCurrent). The LED stops lighting up somewhere slightly at or below 2.64v, where most CR2032 coin cells enter end-of-life on the discharge curve.

Read more and get it made on the project page.