The MAX17823H is a data acquisition system for the management of high-voltage battery modules. The system features a 12-bit SAR ADC that can measure 12 cell voltages and two temperatures in 161 µs. There are 12 internal switches for cell-balancing and extensive built-in diagnostics. Up to 32 devices can be daisy-chained together to manage 384 cells and monitor 64 temperatures.
Cell voltages (0V to 5V) are measured differentially over a 65V common-mode range. Cell measurements have a typical accuracy of 2mV (3.6V cell, 25°C). If oversampling is enabled, up to 128 measurements per channel can be averaged internally with 14-bit resolution. The system can shut itself down in the event of a thermal overload by measuring its own die temperature.
The system uses Maxim’s battery-management UART protocol for robust communications and, when used in conjunction with the MAX17880 12-channel battery monitor, is ideal for automotive battery-management systems that require a high safety-integrity level.
AECQ-100 Grade 2 Temperature Range
-40°C to 105° C
Operating Voltage from 9V to 65V
Ultra-Low Power Operation
Standby Mode: 2mA
Shutdown Mode: 2µA
12 Cell-Voltage Measurement Channels
2mV Accuracy (3.6V, +25°C)
5mV Accuracy (0°C to +45°C)
10mV Accuracy (-40°C to +105°C)
12 Cell-Balancing Switches
Up to 650mA per switch
Emergency Discharge Mode
2 Temperature Measurement Channels
Die Temperature Measurement
Automatic Thermal Protection
29 Voltage Threshold Alerts
12 Overvoltage Faults
12 Undervoltage Faults
2 Overtemperature Faults
2 Undertemperature Faults
1 Cell Mismatch Alert
Built-in Diagnostics to Support ASIL-D and FMEA Requirements
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