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MAX17823B

12-Channel High-Voltage Data Acquisition System

Meets Toughest Automotive and Industrial OEM Requirements for Safety, Performance, and Reliability

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概述

说明

The MAX17823B is a data acquisition system for the management of high-voltage battery modules. The system features 12-bit SAR ADC that can measure 12 cell voltages and two temperatures in 161μs. 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 (0 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, they are ideal for automotive battery-management systems that require a high safety-integrity level.

MAX17823B: Functional Block Diagram

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关键特性

AEC-Q100 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 150mA per Switch
- Emergency-Discharge Mode
Two Temperature-Measurement Channels
Die Temperature Measurement
Automatic Thermal Protection
29 Voltage Threshold Alerts
- 12 Over-Voltage Faults
- 12 Under-Voltage Faults
- Two Over-Temperature Faults
- Two Under-Temperature Faults
- One Cell Mismatch Alert (highest cell versus lowest cell)
Four GPIOs
Built-in Diagnostics to Support ASIL D and FMEA Requirements
Battery-Management UART Protocol
- Daisy-Chain Up to 32 Devices
- Communication Port Isolation
- Up to 2Mbps Baud Rate (Autodetect)
- 1.5µs Propagation Delay per Device
- Packet-Error Checking (PEC)
Factory-Trimmed Oscillators
- No External Crystals Required
10mm x 10mm Package (64-Pin LQFP)