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MAX17843
12-Channel, High-Voltage Smart Sensor
Data-Acquisition Interface
General Description
Benefits and Features
● 12-Cell Battery-Voltage Measurement for Lithium-Ion,
The MAX17843 is a programmable, highly integrated,
high-voltage, 12-channel battery-monitoring smart data-
acquisition interface with extensive features for safety. It
is optimized for use with batteries used in automotive sys-
tems, hybrid electric battery packs, electric cars, and any
system that stacks long series strings of secondary metal
batteries. This highly integrated battery sensor incorpo-
rates a high-speed differential UART bus for robust daisy-
chained serial communication.
NiMH, or Super-Cap Cells
● Two Auxiliary Analog Inputs for NTC Thermistor or
Absolute Voltage Measurement
● Die Temperature Measurement and alert
● High-Accuracy Differential Measurement I/Os
• ±2mV Accuracy at +25°C and 3.6V
● Integrated 12-Channel Data-Acquisition System
• Differential High-Voltage Mux to ADC
• 14-Bit ADC Resolution with Oversampling
• 12 Cell Voltages Measured within 142μs
• Module Voltage Measurement
The analog front-end combines a 12-channel voltage-
measurement data-acquisition system with a high-voltage
switch-bank input. All measurements are done differen-
tially across each cell. The full-scale measurement range
is from 0 to 5.0V with a usable range of 0.2V to 4.8V. A
high-speed successive approximation (SAR) A/D con-
verter is used to digitize the cell voltages at 14-bit resolu-
tion with oversampling. All 12 cells can be measured in
under 142μs. The MAX17843 uses a 2-scan approach
for collecting cell measurements and correcting them for
errors. This 2-phase approach yields excellent accuracy
over temperature and in the face of extreme noise in the
system.
• Redundant ADC
● Battery Fault Detection
• Overvoltage and Undervoltage Digital Threshold
Detection
• Enhanced Diagnostic Features for Fault Detection
to Support ASIL and FMEA
● 12 Internal Cell-Balancing Switches
• Support Up to 150mA per Switch
• Emergency Cell-Discharge Mode
The MAX17843 has two auxiliary analog inputs that can
be used to measure external thermistor components. A
negative temperature coefficient (NTC) thermistor can be
configured with the AUXIN analog inputs to accurately
monitor module or battery-cell temperature. A thermal-
overload detector disables the MAX17843’s linear regula-
tor to protect the IC, and a die-temperature measurement
is also available.
● Integrated 9V to 65V Input Linear Regulator
● Integrated Temperature-Compensated, Voltage
Reference
● Robust Differential Daisy-Chain UART Interface
• Up to 32 Connected ICs in a Single Daisy-Chain
• Compatible with Direct MCU Connection
• Standard UART bytes at 2Mb/s (max) Rate
● Four General-Purpose Digital I/O Lines
Applications
● Built-In Diagnostics to Support ASIL D and FMEA
● 48V Vehicle Battery Modules or Systems
● High-Voltage Electric Vehicle (EVs)
● Hybrid Electric Vehicles (HEVs)
● Battery Packs
Requirements
● Ultra-Low-Power Dissipation
• 2.0mA (typ) Standby-Mode Supply Current
• 3μA Shutdown Mode Leakage Current
● Electric Bikes
● High-Power Battery-Backup Systems
● Super-Cap Backup Systems
● Power Tools
● -40°C to +125°C Operating Temperature Range
(AEC-Q100 Grade 1)
● 64-Pin, Lead-Free/RoHS-Compliant, 10mm x 10mm
LQFP Package
Ordering Information appears at end of data sheet.
19-100084; Rev 2; 4/18