MAX17823BGCB/V+

EVALUATION KIT AVAILABLE MAX17823B 12-Channel High-Voltage Data Acquisition System General Description Benefits and Features The MAX17823B is a data acquisition system for the AECQ-100 Grade 2 Temperature Range management of high-voltage battery modules. The - -40C to 105C system features a 12-bit SAR ADC that can measure Operating Voltage from 9V to 65V 12 cell voltages and two temperatures in 161 s. Ultra-Low Power Operation There are 12 internal switches for cell-balancing and - Standby Mode: 2mA extensive built-in diagnostics. Up to 32 devices can - Shutdown Mode: 2A be daisy-chained together to manage 384 cells and 12 Cell-Voltage Measurement Channels monitor 64 temperatures. - 2mV Accuracy (3.6V, +25C) - 5mV Accuracy (0C to +45C) Cell voltages (0V to 5V) are measured differentially - 10mV Accuracy (-40C to +105C) over a 65V common-mode range. Cell measurements 12 Cell-Balancing Switches have a typical accuracy of 2mV (3.6V cell, 25C). If - Up to 150mA per switch oversampling is enabled, up to 128 measurements - Emergency Discharge Mode per channel can be averaged internally with 14-bit Two Temperature Measurement Channels resolution. The system can shut itself down in the Die Temperature Measurement event of a thermal overload by measuring its own die temperature. Automatic Thermal Protection 29 Voltage Threshold Alerts The system uses Maxims battery-management - 12 Over-Voltage Faults UART protocol for robust communications and when - 12 Under-Voltage Faults used in conjunction with the MAX17880 12-channel - Two Over-Temperature Faults battery monitor, it is ideal for automotive battery- - Two Under-Temperature Faults management systems that require a high safety - One Cell Mismatch Alert integrity level. (highest cell versus lowest cell) Four GPIOs Built-in Diagnostics to Support ASIL D and Applications FMEA Requirements High-Voltage Battery Stacks Battery-Management UART Protocol Electric Vehicles (EVs) Daisy-Chain up to 32 Devices Hybrid Electric Vehicles (HEVs) Communication Port Isolation Electric Bikes Up to 2Mbps Baud Rate (auto-detect) Battery-Backup Systems (UPS) 1.5s Propagation Delay per Device Super-Cap Systems Packet-Error Checking (PEC) Battery-Powered Tools Factory-Trimmed Oscillators No External Crystals Required 10mm x 10mm Package (64-pin LQFP) Ordering Information appears at end of data sheet. 19-100598 Rev 1 11/19 MAX17823B 12-Channel High-Voltage Data Acquisition System Simplified Operating Circuit MAX17823B To module n+1 C81 R80 R81 4.7 F HV Module n+1 Bus bar 50V DCIN TXUP RXLP C80 TXUN UART RXLN 2.2 F 100V R13 RXUP Interface TXLP D91 VBLK P TXLN VBAT+ RXUN C13 D82 BAV70 R12 C12 Notes: C12 1. Capacitor ratings shown in this datasheet are based on expected Cell12 R32 conditions and may be modified based on applications requirements. SW12 2. D90, D91 (optional) provide device power through sense wires if R11 C11 any V BAT supply wire is open. C11 C32 3. See Applications Section for UART interface. Cell11 R31 4. R0 R13: 1K ( application dependent) SW11 5. R20 R32: ( application dependent) R10 5. C0 C12, C21 C32: 100nF (application dependent) C10 C10 C31 6. C13: 470nF (application dependent) Cell10 R30 SW10 CPP R9 C9 C82 0.1 F C9 C30 CPN 100V Cell9 R29 VAA SW9 C83 1.0 F R8 AGND 16V C8 C8 C29 VDDL1 Cell8 R28 C84 0.47 F SW8 GNDL1 16V R7 C7 VDDL2 C7 C28 C85 0.47 F 16V Cell7 R27 GNDL2 SW7 VDDL3 R6 C86 0.47 F C6 15-wire GNDL3 16V C6 C27 battery pack Cell6 R26 SHDNL SW6 C87 1.0nF R5 25V C5 AGND C5 C26 CTG Cell5 R25 SW5 R4 C4 GPIO0 To / from host C4 C25 GPIO1 (if used) Cell4 R24 GPIO2 SW4 GPIO3 R3 C3 Module n-1 or host C3 C24 Cell3 R23 SW3 TXLP RXUP R2 TXLN RXUN UART C2 Interface RXLP TXUP C2 C23 RXLN TXUN Cell2 R22 SW2 R1 C1 THRM C1 C22 C62 R60 R61 100pF 10K 10K Cell1 R21 AGND SW1 R0 C0 AUXIN1 C0 C21 AUXIN2 R20 VBAT- SW0 D90 RT1 AGND C60 C61 RT1 T T C20 10K 100pF 100pF 10K 1F Bus bar To module n-1 www.maximintegrated.com Maxim Integrated 2