Tag Archives: fuel gauge

Fuel gauge needs no battery characterization

by Susan Nordyk @ edn.com

The MAX17055 single-cell fuel gauge from Maxim not only eliminates battery characterization, but also keeps SOC (state-of-charge) error to within 1% in most scenarios. With its ModelGauge m5 EZ algorithm, the device provides tolerance against battery diversity for most lithium batteries and applications. It also allows system designer’s to decide when to shut down the device when the battery gets low, maximizing device runtime.

As the battery approaches the critical region near empty, the ModelGauge m5 algorithm invokes a special error correction mechanism that eliminates any error. In addition, it provides three methods for reporting the age of the battery: reduction in capacity, increase in battery resistance, and cycle odometer.

Fuel gauge needs no battery characterization – [Link]

MAX17055 – a 7μA operating current fuel gauge

by Graham Prophet @ eedesignnewseurope.com

Maxim Integrated has posted details of a battery charge monitor IC for which it claims the lowest quiescent current available, at 7µA. The 1-cell Fuel Gauge with Maxim’s ModelGauge m5 EZ algorithm can eliminate battery characterization issues.

MAX17055 – a 7μA operating current fuel gauge – [Link]

Fuel-gauge ICs help prevent battery clones

265a9c07b25a87d1ac079c6af20915a7

Maxim’s family of ModelGauge m5 standalone fuel gauges provides SHA-256 authentication with a 160-bit secret key to make it harder to clone battery packs. The ICs also implement the ModelGauge m5 algorithm, which converts raw measurements of battery voltage, current, and temperature into accurate state-of-charge (SOC%), absolute capacity (mAhr), time-to-empty, and time-to-full readings. by Susan Nordyk @ end.com:

ModelGauge m5 automatically compensates for cell aging, temperature, and discharge rate. As the battery approaches near empty, ModelGauge m5 invokes an error-correction mechanism that eliminates any error.

The MAX17201 and MAX17211 monitor a single-cell pack, while the MAX17205 and MAX17215 monitor and balance a 2S or 3S pack or monitor a multiple-series cell pack. In addition to high accuracy and age forecasting, the fuel gauges offer low power consumption. The MAX17201 and MAX17211 have a quiescent current of 18 µA when active and 9 µA in hibernate mode. The same specifications for the MAX17205 and MAX17215 are 25 µA and 12 µA, respectively.

Fuel-gauge ICs help prevent battery clones – [Link]