EVALUATION KIT AVAILABLE MAX17201/MAX17205/ Stand-Alone ModelGauge m5 Fuel Gauge MAX17211/MAX17215 with SHA-256 Authentication General Description Benefits and Features The MAX1720x/MAX1721x are ultra-low power stand-alone ModelGauge m5 Algorithm fuel gauge ICs that implement the Maxim ModelGauge Eliminates Error when Approaching Empty Voltage m5 algorithm without requiring host interaction for configura- Eliminates Coulomb-Counter Drift tion. This feature makes the MAX1720x/MAX1721x excellent Current, Temperature, and Age Compensated pack-side fuel gauges. The MAX17201/MAX17211 monitor a Does Not Require Empty, Full, or Idle States single cell pack. The MAX17205/MAX17215 monitor and bal- No Characterization Required for EZ Performance ance a 2S or 3S pack or monitor a multiple-series cell pack. (See the ModelGauge m5 EZ Performance Section) Cycle+ Age Forecasting Observes Lifespan To prevent battery pack cloning, the ICs integrate SHA- 256 authentication with a 160-bit secret key. Each IC Nonvolatile Memory for Stand-Alone Operation incorporates a unique 64-bit ID. Learned Parameters and History Logging Up to 75 Words Available for User Data The ModelGauge m5 algorithm combines the short-term accuracy and linearity of a coulomb counter with the long- Precision Measurement System term stability of a voltage-based fuel gauge, along with No Calibration Required temperature compensation to provide industry-leading Time-to-Empty and Time-to-Full Estimation fuel gauge accuracy. The IC automatically compensates Temperature Measurement for cell aging, temperature, and discharge rate, and pro- Die Temperature vides accurate state of charge (SOC) in milliampere-hours Up to Two External Thermistors (mAh) or percentage (%) over a wide range of operating conditions. As the battery approaches the critical region Multiple Series Cell Pack Operation near empty, the ModelGauge m5 algorithm invokes a spe- Low Quiescent Current cial error correction mechanism that eliminates any error. MAX172x1: 18A Active, 9A Hibernate The ICs provide accurate estimation of time-to-empty and MAX172x5: 25A Active, 12A Hibernate time-to-full, Cycle+ age forecast, and three methods Alert Indicator for Voltage, SOC, Temperature, for reporting the age of the battery: reduction in capacity, Current, and 1% SOC Change increase in battery resistance, and cycle odometer. High-Speed Overcurrent Comparators The ICs provide precision measurements of current, voltage, Predicts Remaining Capacity Under Theoretical Load and temperature. Temperature of the battery pack is mea- sured using an internal temperature measurement and up to SHA-256 Authentication two external thermistors supported by ratiometric measure- 2 Maxim 1-Wire or 2-Wire (I C) Interface ments on auxiliary inputs. A Maxim 1-Wire (MAX17211/ 2 SBS 1.1 Compatible Register Set MAX17215) or 2-wire I C (MAX17201/MAX17205) inter- face 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. Applications Smartphones and Tablets Portable Game Players Ordering Information appears at end of data sheet. e-Readers Digital Still and Video Cameras Handheld Computers and Terminals Portable Medical Equipment ModelGauge and Cycle+ are trademarks and 1-Wire is a regis- Handheld Radios tered trademark of Maxim Integrated Products, Inc. 19-8424 Rev 2 8/16MAX17201/MAX17205/ Stand-Alone ModelGauge m5 Fuel Gauge MAX17211/MAX17215 with SHA-256 Authentication Simplified Block Diagram PACK+ 10 VBATT REG3 0.1F DQ/SDA COMMUNICATION CELL1 INTERFACE OD/SCL CELL2 CELLx + REG2 0.47F SINGLE-CELL MAX17201 EXAMPLE GND (WLP) PACK PROTECTOR CSP EP (TDFN) CSN PACK- R SENSE Maxim Integrated 2 www.maximintegrated.com