Описание
The MAX17201 are ultra-low power stand-alone fuel gauge ICs that implement the Maxim Model Gauge m5 algorithm without requiring host interaction for configuration. This feature makes the MAX17201 excellent pack-side fuel gauges. The MAX17201 monitor a single cell pack. 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 Model Gauge m5 algorithm combines the short-term accuracy and linearity of a coulomb counter with the longterm stability of a voltage-based fuel gauge, along with temperature compensation to provide industry-leading fuel gauge accuracy. The IC automatically compensates for cell aging, temperature, and discharge rate, and provides accurate state of charge (SOC) in milliampere-hours (mAh) or percentage (%) over a wide range of operating conditions. As the battery approaches the critical region near empty, the Model Gauge m5 algorithm invokes a special error correction mechanism that eliminates any error. 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 provide 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 ratio metric measurements on auxiliary inputs. A Maxim 2-wire I2C (MAX17201) interface provides access to data and control registers. The ICs are available in lead-free, 3mm x 3mm, 14-pin TDFN and 1.6mm x 2.4mm 15-bump WLP packages.
- Model Gauge m5 Algorithm
- Eliminates Error when Approaching Empty Voltage
- Eliminates Coulomb-Counter Drift
- Current, Temperature, and Age Compensated
- Does Not Require Empty, Full, or Idle States
- No Characterization Required for EZ Performance
- Cycle+ Age Forecasting Observes Lifespan
- Nonvolatile Memory for Stand-Alone Operation
- Learned Parameters and History Logging
- Up to 75 Words Available for User Data
- Precision Measurement System
- No Calibration Required
- Time-to-Empty and Time-to-Full Estimation
- Temperature Measurement
- Die Temperature
- Up to Two External Thermistors
- Multiple Series Cell Pack Operation
- Low Quiescent Current
- MAX17201: 18µA Active, 9µA Hibernate
- Alert Indicator for Voltage, SOC, Temperature, Current, and 1% SOC Change
- High-Speed Over current Comparators
- Predicts Remaining Capacity Under Theoretical Load
- SHA-256 Authentication
- Maxim 2-Wire (I2C) Interface
- SBS 1.1 Compatible Register Set
