Microcontroller Battery Monitor Circuit Needs Only One Pin (.PDF Download)

March 17, 2017

This circuit solved a problem encountered in developing a portable device with an ARM Cortex-M0 processor. The power supply consisted of two AA batteries (2 × 1.5 V), and I needed to signal the user about the battery's state. The Cortex-M0 operates from 3.3 V down to 2.0 V, and an AA battery is considered discharged when its voltage drops to 1.1 V, so the available supply is 1.1 V × 2 = 2.2 V. This was a very low-power application that could work down to 2.2 V, so it was not necessary to warn the user to change the batteries until that voltage level was reached...

Register or Sign in below to download the full article in .PDF format, including high-resolution graphics and schematics when applicable.

Sponsored

Explore Raspberry Pi’s imaging and AI tools in this free webinar with expert insights from Naushir Patuck. Register now to attend live or watch the recording later.
TE Connectivity AMP’s mezzanine connectors include Micro MaTch, Free Height & MICTOR SB connectors all available at Digi-Key. Same day shipping!
Whether you’re a beginner or an enthusiast, our free pocket guide, spanning roughly 60 pages, offers a broad insight into satellite technologies in one handy place. From clear...
Now that Tesla said it, automakers are following. The move to 48V has started. Switching to a 48V electrical system greatly reduces the current levels the vehicle's wiring harness...