First secure stand alone battery gauge simplifies designs

First secure stand alone battery gauge simplifies designs

New Products |
By Nick Flaherty

Maxim Integrated Products has developed a series of secure battery fuel gauges that simplify designs by avoiding the need for battery pack customization.

Implementing fuel gauges can be difficult as the battery voltage varies with temperature and load, while coulomb-counting requires sophisticated compensation to eliminate offset accumulation errors. Maxim’s ModelGauge m5 fuel gauges include an 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), enabling maximum run-time. To ease the design process, the ModelGauge m5 EZ configuration eliminates the time and resource-consuming characterization process for a large number of battery types. They are also the industry’s first to integrate SHA-256 for secure authentication to prevent battery clones.

Battery packs generally need to be replaced every few years—when batteries age, their characteristics change over time and no longer provide adequate run-time. The ModelGauge m5 robust algorithm detects the smallest changes in the capacity of the battery to more accurately predict how long the battery will last before the capacity degrades rapidly. With the Cycle+ age forecast information from ModelGauge m5 fuel gauges, system designers are able to adjust charger parameters to extend the battery life, or to plan a timely replacement of the battery. Maxim’s ModelGauge m5 portfolio of products are ideal for any rechargeable battery operated device, such as wearables, drones, tablets, smartphones, and other IoT applications.

No battery characterization or calibration required is with th eEZ configuration tool, and there is no need to reset to track battery usage correctly as the algorithm learns the capacity without battery going to full, empty, or relaxed state. The SHA-256 authentication uses a 160 bit secret key, making it harder to clone battery packs.

There are two versions with different quiescent current: 9µA low-power operation for the MAX17201/MAX17211 and 12µA operation for the MAX17205/MAX17215. These are available in a 14-pin, TDFN package (3mm x 3mm) and specified over the -40-degree Celsius to +85-degree Celsius temperature range, and have Maxim 1-Wire (MAX17211/MAX17215) or 2-wire I²C (MAX17201/MAX17205) interfaces to access data and control registers.

Pricing starts at $1.39 (1,000-up, FOB USA) and evaluation kits available: MAX17201GEVKIT, MAX17205GEVKIT, MAX17211GEVKIT, MAX17215GEVKIT 

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