EVALUATION KIT AVAILABLE
MAX17201/MAX17205/
MAX17211/MAX17215
Stand-Alone ModelGauge m5 Fuel Gauge
with SHA-256 Authentication
General Description
Benefits and Features
The MAX1720x/MAX1721x are ultra-low power stand-alone
fuel gauge ICs that implement the Maxim ModelGauge™
m5 algorithm without requiring host interaction for configura-
tion. This feature makes the MAX1720x/MAX1721x excellent
pack-side fuel gauges. The MAX17201/MAX17211 monitor a
single cell pack. The MAX17205/MAX17215 monitor and bal-
ance a 2S or 3S pack or monitor a multiple-series cell pack.
● 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
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.
● Nonvolatile Memory for Stand-Alone Operation
• 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-
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 pro-
vides 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 spe-
cial 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.
● 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
The ICs provide precision measurements of current, voltage,
and temperature. Temperature of the battery pack is mea-
sured using an internal temperature measurement and up to
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
● e-Readers
Ordering Information appears at end of data sheet.
● Digital Still and Video Cameras
● Handheld Computers and Terminals
● Portable Medical Equipment
● Handheld Radios
ModelGauge and Cycle+ are trademarks and 1-Wire is a regis-
tered trademark of Maxim Integrated Products, Inc.
19-8424; Rev 2; 8/16
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