MAX17215 Datasheet

• 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
  • MAX17215: 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

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

The MAX17215 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 MAX17215 excellent pack-side fuel gauges. The 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.

The ModelGauge™ m5 algorithm combines the short-term accuracy and linearity of a coulomb counter with the long-term 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 ModelGauge 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 ratiometric measurements on auxiliary inputs. A Maxim 1-Wire^® (MAX17215) interface provides access to data and control registers. The ICs are available in lead-free, 3mm × 3mm, 14-pin TDFN and 1.6mm × 2.4mm 15-bump WLP packages.