LTC6802IG-2

LTC6802-2 Multicell Addressable Battery Stack Monitor FeaTures n n DescripTion The LTC®6802-2 is a complete battery monitoring IC that includes a 12-bit ADC, a precision voltage reference, a high voltage input multiplexer and a serial interface. Each LTC6802-2 can measure 12 series connected battery cells, with a total input voltage up to 60V. The voltage on all 12 input channels can be measured within 13ms. Many LTC6802-2 devices can be stacked to measure the voltage of each cell in a long battery string. Each LTC6802-2 has an individually addressable serial interface, allowing up to 16 LTC6802-2 devices to interface to one control processor and operate simultaneously. To minimize power, the LTC6802-2 offers a measure mode to monitor each cell for overvoltage and undervoltage conditions. A standby mode is also provided to reduce supply current to 50µA. Each cell input has an associated MOSFET switch that can discharge any overcharged cell. The related LTC6802-1 offers a serial interface that allows the serial ports of multiple LTC6802-1 devices to be daisy chained without opto-couplers or isolators. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. n n n n n n n n n n n Measures Up to 12 Li-Ion Cells in Series (60V Max) Stackable Architecture Enables Monitoring High Voltage Battery Stacks Individually Addressable with 4-Bit Address 0.25% Maximum Total Measurement Error 13ms to Measure All Cells in a System Cell Balancing: On-Chip Passive Cell Balancing Switches Provision for Off-Chip Passive Balancing Two Thermistor Inputs Plus Onboard Temperature Sensor 1MHz Serial Interface with Packet Error Checking High EMI Immunity Delta-Sigma Converter With Built-In Noise Filter Open-Wire Connection Fault Detection Low Power Modes 44-Lead SSOP Package applicaTions n n n n Electric and Hybrid Electric Vehicles High Power Portable Equipment Backup Battery Systems High Voltage Data Acquisition Systems Typical applicaTion NEXT 12-CELL PACK ABOVE V+ LTC6802-2 DIE TEMP MEASUREMENT ERROR (%) 0.30 0.25 0.20 0.15 0.10 0.05 0 –0.05 –0.10 –0.15 –0.20 –0.25 –0.30 –50 68022 TA01a Measurement Error Over Extended Temperature 7 REPRESENTATIVE UNITS VS = 43.2V CELL VOLTAGE 3.6V + SERIAL DATA REGISTERS AND CONTROL MUX 4-BIT ADDRESS 12-CELL BATTERY STRING + + V – 12-BIT ∆∑ ADC NEXT 12-CELL PACK BELOW 100k NTC EXTERNAL TEMP VOLTAGE REFERENCE –25 0 25 50 75 TEMPERATURE (°C) 100 125 68022 TA01b 100k 68022fa  LTC6802-2 absoluTe MaxiMuM raTings (Note 1) pin conFiguraTion TOP VIEW V+ C12 S12 C11 S11 C10 S10 C9 S9 1 2 3 4 5 6 7 8 9 44 CSBI 43 SDO 42 SDI 41 SCKI 40 A3 39 A2 38 A1 37 A0 36 GPIO2 35 GPIO1 34 WDTB 33 MMB 32 TOS 31 VREG 30 VREF 29 VTEMP2 28 VTEMP1 27 NC 26 V– 25 S1 24 C1 23 S2 Total Supply Voltage (V+ to V–) .................................60V Input Voltage (Relative to V–) C1 ............................................................ –0.3V to 9V C12 ..........................................V+ – 0.6V to V+ + 0.3V Cn (Note 5) ......................... –0.3V to Min (9 • n, 60V) Sn (Note 5) ......................... –0.3V to Min (9 • n, 60V) All Other Pins ........................................... –0.3V to 7V Voltage Between Inputs Cn to Cn – 1 ............................................. –0.3V to 9V Sn to Cn – 1 ............................................. –0.3V to 9V C12 to C8 ............................................... –0.3V to 25V C8 to C4 ................................................. –0.3V to 25V C4 to V– ................................................. –0.3V to 25V Operating Temperature Range.................. –40°C to 85°C Specified Temperature Range .................. –40°C to 85°C Junction Temperature ........................................... 150°C Storage Temperature Range................... –65°C to 150°C *n = 1 to 12 C8 10 S8 11 C7 12 S7 13 C6 14 S6 15 C5 16 S5 17 C4 18 S4 19 C3 20 S3 21 C2 22 G PACKAGE 44-LEAD PLASTIC SSOP TJMAX = 150°C, θJA = 70°C/W orDer inForMaTion LEAD FREE FINISH LTC6802IG-2#PBF TAPE AND REEL LTC6802IG-2#TRPBF PART MARKING LTC6802G-2 PACKAGE DESCRIPTION 44-Lead Plastic SSOP TEMPERATURE RANGE –40°C to 85°C Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ 68022fa  LTC6802-2 elecTrical characTerisTics SYMBOL PARAMETER DC Specifications VACC Measurement Resolution ADC Offset Voltage ADC Gain Error VERR Total Measurement Error Quantization of the ADC (Note 2) (Note 2) l l l The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. V+ = 43.2V, V– = 0V, unless otherwise noted. CONDITIONS MIN TYP 1.5 –0.5 –0.12 –0.22 0.8 0.5 0.12 0.22 MAX UNITS mV/Bit mV % % mV mV mV mV mV mV mV mV mV mV mV V 5•n 15 10 5 4.200 2.300 3 l (Note 4) VCELL = 0V VCELL = 2.3V VCELL = 2.3V VCELL = 3.6V VCELL = 3.6V VCELL = 4.2V VCELL = 4.2V VCELL = 4.6V VTEMP = 2.3V VTEMP = 3.6V VTEMP = 4.2V Full-Scale Voltage Range l l l l l l –2.8 –5.1 –4.3 –7.9 –5 –9.2 –5.1 –7.9 –9.2 3.7 1.8 1.2 0 4.182 2.290 3.020 3.015 ±8 2.8 5.1 4.3 7.9 5 9.2 5.1 7.9 9.2 VCELL VCM Cell Voltage Range 5 l l l l l l Common Mode Voltage Range Measured Range of Inputs Cn for