LTC6802IG-2#3ZZPBF

LTC6802-2 Multicell Addressable Battery Stack Monitor FEATURES DESCRIPTION Qualified for Automotive Applications nn Measures Up to 12 Li-Ion Cells in Series (60V Max) nn Stackable Architecture Enables Monitoring High Voltage Battery Stacks nn Individually Addressable with 4-Bit Address nn 0.25% Maximum Total Measurement Error nn 13ms to Measure All Cells in a System nn Cell Balancing: nn On-Chip Passive Cell Balancing Switches nn Provision for Off-Chip Passive Balancing nn Two Thermistor Inputs Plus Onboard Temperature Sensor nn 1MHz Serial Interface with Packet Error Checking nn High EMI Immunity nn Delta-Sigma Converter with Built-In Noise Filter nn Open-Wire Connection Fault Detection nn Low Power Modes nn 44-Lead SSOP Package 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. APPLICATIONS 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. nn Electric and Hybrid Electric Vehicles High Power Portable Equipment nn Backup Battery Systems nn High Voltage Data Acquisition Systems nn nn 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. All registered trademarks and trademarks are the property of their respective owners. TYPICAL APPLICATION Measurement Error Over Extended Temperature LTC6802-2 V+ 0.30 DIE TEMP + 0.25 SERIAL DATA 12-CELL BATTERY STRING REGISTERS AND CONTROL 4-BIT ADDRESS MUX + 12-BIT ∆∑ ADC + V EXTERNAL TEMP 7 REPRESENTATIVE UNITS VS = 43.2V CELL VOLTAGE 3.6V 0.15 0.10 0.05 0 –0.05 –0.10 –0.15 –0.20 –0.30 –50 VOLTAGE REFERENCE 68022 TA01a 100k NTC 0.20 –0.25 – NEXT 12-CELL PACK BELOW MEASUREMENT ERROR (%) NEXT 12-CELL PACK ABOVE –25 0 25 50 75 TEMPERATURE (°C) 100 125 68022 TA01b 100k Rev. B Document Feedback For more information www.analog.com 1 LTC6802-2 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) 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 TOP VIEW V+ 1 44 CSBI C12 2 43 SDO S12 3 42 SDI C11 4 41 SCKI S11 5 40 A3 C10 6 39 A2 S10 7 38 A1 C9 8 37 A0 S9 9 36 GPIO2 C8 10 35 GPIO1 S8 11 34 WDTB C7 12 33 MMB S7 13 32 TOS C6 14 31 VREG S6 15 30 VREF C5 16 29 VTEMP2 S5 17 28 VTEMP1 C4 18 27 NC S4 19 26 V– C3 20 25 S1 S3 21 24 C1 C2 22 23 S2 G PACKAGE 44-LEAD PLASTIC SSOP TJMAX = 150°C, θJA = 70°C/W ORDER INFORMATION TUBE TAPE AND REEL PART MARKING PACKAGE DESCRIPTION SPECIFID TEMPERATURE RANGE LTC6802IG-2#PBF LTC6802IG-2#TRPBF LTC6802G-2 44-Lead Plastic SSOP –40°C to 85°C LTC6802IG-2#3ZZPBF LTC6802IG-2#3ZZTRPBF LTC6802G-2 44-Lead Plastic SSOP –40°C to 85°C Contact the factory for parts specified with wider operating temperature ranges. Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix. Versions of the LTC6802-2 models are available with controlled manufacturing to support the quality and reliability requirements of automotive applications. These models are available with #WTRPBF, #WPBF or #ZZPBF suffix and are listed in ADI’s ARPL. Note that these automotive models may have specifications that differ from the commercial models; therefore designers should review the Electrical Characteristics section of this data sheet carefully. Only the automotive grade products shown are available for use in automotive applications. Contact your local Analog Devices account representative for specific product ordering information and to obtain the specific Automotive Reliability reports for these models. 2 Rev. B For more information www.analog.com LTC6802-2 ELECTRICAL CHARACTERISTICS 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. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS DC Specifications VACC VERR Measurement Resolution Quantization of the ADC l ADC Offset Voltage (Note 2) l –0.5 0.5 mV ADC Gain Error (Note 2) l –0.12 –0.22 0.12 0.22 % % Total Measurement Error (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 1.5 l –2.8 –5.1 –4.3 –7.9 –5 –9.2 l l l –5.1 –7.9 –9.2 l l VCELL Cell Voltage Range VCM Common Mode Voltage Range Measured Range of Inputs Cn for