The ICs automatically compensate for cell aging, temperature, and discharge rate, and provide accurate state of charge (SOC) in milliampere-hours (mAh) or percentage (%) over a wide range of operating conditions. The ICs provide accurate estimation of time-to-empty and time-to-full, Cycle+™ age forecast, and three methods for reporting the age of the battery: reduction in capacity, increase in battery resistance, and cycle odometer.
The ICs provides precision measurements of current, voltage, and temperature. Temperature of the battery pack is measured using an internal temperature measurement and up to two external thermistors supported by ratiometric measurements on auxiliary inputs. The ICs can provide alerts by detecting a high or low voltage, current, temperature, or state of charge. The ICs also contain two programmable, fast overcurrent comparators that allow spikes in system current to be detected and warn the system to make appropriate adjustments to prevent such conditions that could cause the battery to crash abruptly. Both comparators have programmable threshold levels and programmable debounced delays.
To prevent battery pack cloning, the ICs are the only stand-alone fuel gauges that integrate SHA-256 authentication with a 160-bit secret key. Each IC incorporates a unique 64-bit ID.
The ICs are available in a manufacturing handling friendly, lead-free, 3mm x 3mm, 14-pin TDFN package.
In summary, the latest advances in fuel gauge technology based on decades of battery management and design experience, are bringing world-class fuel gauge accuracy to all customers, from large manufacturers to start-ups and makers. ModelGauge m5 EZ products allow designers to focus on what they’re good at and not have to worry about gas gauge implementation.
About the author:
Bakul Damle is a Business Director at Maxim Integrated, and is responsible for the company’s battery management product line – www.maximintegrated.com