Worried About Clones? Get The Right Battery-gauge Chip


Implementing pack-side battery gauges in portable devices is now easier and more secure with Maxim’s new battery energy measuring chips, which feature SHA-256 anti-cloning authentication to prevent battery clones. Applications include any rechargeable battery operated device, such as wearables, drones, tablets, smartphones, and other IoT applications.

ModelGauge m5 fuel gauges, Maxim says, “include a sophisticated algorithm that converts raw measurements such as battery voltage, current, and temperature into accurate state-of-charge (SOC%), absolute capacity (mAhr), time-to-empty, and time-to-full (while charging), all of which improve the user experience of the host device while enabling maximum run-time.”

Implementing the ModelGauge m5 algorithm, the chips don’t require host interaction for configuration. This feature makes the MAX1720x/MAX1721x excellent pack-side fuel gauges. The MAX17201/MAX17211 monitor a single cell pack. The MAX17205/MAX17215 monitor and balance a 2S or 3S pack or monitor a multiple-series cell pack.

Unique Cycle+ age forecasting offered by Maxim is claimed to detect the smallest changes in the capacity of the battery to more accurately predict how long the battery will last before the capacity degrades rapidly. This allows designers to adjust charger parameters to extend the battery life, or to plan a timely replacement of the battery.


To prevent battery pack cloning, the ICs integrate SHA-256 authentication with a 160-bit secret key. Each IC incorporates a unique 64-bit ID.

The new MAX17201/MAX17211 offer 9µA low-power operation and the MAX17205/MAX17215 feature 12µA low-power operation.

“From decades of battery management and cryptographic design experience, Maxim is bringing world-class fuel gauge accuracy and security to all customers, from large manufacturers to start-ups and makers,” said Bakul Damle, Mobile Power Business Management Director at Maxim Integrated. “Our ModelGauge m5 EZ products allow designers to focus on what they’re good at and not have to worry about gas gauge implementation.”

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Available in a 14-pin, TDFN package (3mm x 3mm), the chips are specified over the -40°C to +85°C temperature range. Evaluation kits available for the new devices are – MAX17201GEVKIT, MAX17205GEVKIT, MAX17211GEVKIT, MAX17215GEVKIT. Pricing starts at $1.39 (1,000-up, FOB USA)

For more information, view the full Press release.




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