LTC6802-1

Features:

· Measures up to 12 Li-Ion Cells in Series (60V Max)
· Stackable Architecture Enables >1000V Systems
· 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 On-board 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


Pinout




Specifications

Total Supply Voltage (V+ to V) .......... ..................60V Input Voltage (Relative to V) C1 ......................................... ................... 0.7V to 9V C12 ..........................................V+ 0.7V to V+ + 0.7V Sn pins ............................ ... Cn-1 0.7V to Cn-1 + 9V CSBO, SCKO, SDOI ..................V+ 1.4V to V+ + 0.7V All other pins ........................................... 0.7V to 7V Voltage Between Inputs Cn to Cn-1 ............................................... 0.7V to 9V Input Current All Pins ...............................................................±10mA Operating Temperature Range....... ........ 40 to 85 Specifi ed Temperature Range ..................40 to 85 Junction Temperature ........................................... 150 Storage Temperature Range ...................65to 150 *n = 2 to 11


Description

The LTC^®6802-1 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 LTC6802-1 can measure up to 12 series connected battery cells with an input common mode voltage up to 60V. Using a unique level-shifting serial interface, multiple LTC6802-1 devices can be connected in series, without optocouplers or isolators, allowing for monitoring of every cell in a long
string of series-connected batteries.

When multiple LTC6802-1 devices are connected in series they can operate simultaneously, permitting all cell voltages
in the stack to be measured within 13ms. To minimize power, the LTC6802-1 offers a measure mode to monitor each cell for overvoltage and undervoltage conditions. A standby mode is also provided. Each cell input has an associated MOSFET switch for discharging overcharged cells.

The related LTC6802-2 offers an individually addressable serial interface.