MAX17205
Stand-Alone ModelGauge m5 Fuel Gauge with SHA-256 Authentication
Industry's First Stand-Alone ModelGauge m5 Fuel Gauge with SHA-256 Authentication
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Overview
Features and Benefits
- 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
Product Details
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.
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® (MAX17211/MAX17215) or 2-wire I2C (MAX17201/MAX17205) 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.
Design Solution: Advanced Battery Management for the Rest of Us ›
How to Prevent Battery Cloning Using the MAX17211EVKIT
Applications
- Digital Still and Video Cameras
- e-Readers
- Handheld Computers and Terminals
- Handheld Radios
- Portable Game Players
- Portable Medical Equipment
- Smartphones and Tablets
Product Categories
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (8)
Documentation & Resources
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MAX17205 Reliability Data1/12/2023PDF225K
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UG-6258: MAX1720x/MAX1721x Battery Pack Implementation Guide6/8/2016PDF142K
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UG-6259: MAX1720x/MAX1721x System Side Implementation Guide6/8/2016PDF160K
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UG-6260: MAX1720x/MAX1721x Software Implementation Guide6/8/2016PDF139K
Tools & Simulations
Software Development
Reference Designs (1)
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
PCN-PDN Information
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.