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

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.

Register for Complete Access (Valid Email Required)

2016 salary survey

By registering on Electronic Design now, you'll not only gain access to premium content, you'll also become part of a robust engineering community. Gain access to the complete 2016 Salary & Career Report when you register now.

Joining the Electronic Design community also allows you to:

  • Become a member of a group of exclusive Engineers
  • Participate in Expert and Reader driven Q&A's
  • Start your own conversation by commenting on any article or blog
  • Communicate and network with other Engineers from all over the world
  • Gain access to high-quality content

Already registered? here.
Understanding the AirPods' Rise
Q&A: What’s New in the Wireless Audio Market? Interview with Jawad Haider, Marvell Semiconductor Read Now
What's New
Electronic Design's Products of the Week By Electronic Design Staff Read Now
Fusing Sensors
TDK Swears by Sensor Fusion in $1.3 Billion Deal for InvenSenseBy James Morra New Products Read Now
Search Parts Fast

Search by number or manufacturer


powered by:


Connect With Us

Sponsored Introduction Continue on to (or wait seconds) ×