General Description
The MAX1720x/MAX1721x are ultra-low power stand-alone fuel gauge ICs that implement the Maxim ModelGauge™ m5 algorithm without requiring 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.
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.

Benefits and Features
● ModelGauge 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
      (See the ModelGauge m5 EZ Performance Section)
   • 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
   • MAX172x1: 18µA Active, 9µA Hibernate
   • MAX172x5: 25µA Active, 12µA Hibernate
● Alert Indicator for Voltage, SOC, Temperature,
   Current, and 1% SOC Change
● High-Speed Overcurrent Comparators
● Predicts Remaining Capacity Under Theoretical Load
● SHA-256 Authentication
● Maxim 1-Wire or 2-Wire (I2C) Interface
● SBS 1.1 Compatible Register Set

APPLICATIONs
● Smartphones and Tablets
● Portable Game Players
● e-Readers
● Digital Still and Video Cameras
● Handheld Computers and Terminals
● Portable Medical Equipment
● Handheld Radios