原标题：Linear LTC6803第二代电池监视解决方案

　　Linear 公司的LTC6803是第二代完整的电池监视器，包括有12位ADC，精密的基准电压，高电压输入复接器和1MHz串行接口。具有可堆栈的架构，每个器件可测试多达12个串接的电池或超级电容，总测试误差最大为0.25%,主要用于电力和混合动力汽车，大功率手持设备，备用电池系统和电动自行车，摩托车等。本文介绍了LTC6803主要特性，方框图，典型应用框图以及96节电池监视电路图和硬件关断电路方框图。

　　The LTCR6803 is a 2nd generation, complete battery monitoring IC that includes a 12-bit ADC, a precision voltage reference, a high voltage input multiplexer and a serial interface. Each LTC6803 can measure up to 12 series connected battery cells or supercapacitors. Many LTC6803 devices can be stacked to measure the voltage of each cell in a long battery string. Each LTC6803-2/LTC6803-4 has an individually addressable serial interface, allowing up to 16 LTC6803-2/LTC6803-4 devices to interface to one control processor and operate simultaneously. Each cell input has an associated MOSFET switch for discharging overcharged cells. The LTC6803-2 connects the bottom of the stack to V– internally. It is pin compatible with the LTC6802-2, providing a drop-in upgrade. The LTC6803-4 separates the bottom of the stack from V–, improving cell 1 measurement accuracy.

　　The LTC6803 provides a standby mode to reduce supply current to 12μA. Furthermore, the LTC6803 can be powered from an isolated supply, providing a technique to reduce battery stack current draw to zero. The related LTC6803-1 and LTC6803-3 offer a serial interface that allows the serial ports of multiple LTC6803-1 or LTC6803-3 devices to be daisy chained without optocouplers or isolators.

　　LTC6803主要特性：

　　Measures Up to 12 Battery Cells in Series

　　Stackable Architecture

　　Supports Multiple Battery Chemistries and Supercapacitors

　　Individually Addressable Serial Interface

　　0.25% Maximum Total Measurement Error

　　Engineered for ISO26262 Compliant Systems

　　13ms to Measure All Cells in a System

　　Passive Cell Balancing:

　　– Integrated Cell Balancing MOSFETs

　　– Ability to Drive External Balancing MOSFETs

　　Onboard Temperature Sensor and Thermistor Inputs

　　1MHz Serial Interface with Packet Error Checking

　　Safe with Random Connection of Cells

　　Built-In Self Tests

　　Delta-Sigma Converter With Built-In Noise Filter

　　Open-Wire Connection Fault Detection

　　12μA Standby Mode Supply Current

　　High EMI Immunity

　　44-Lead SSOP Package

　　LTC6803应用：

　　Electric and Hybrid Electric Vehicles

　　High Power Portable Equipment

　　Backup Battery Systems

　　Electric Bicycles, Motorcycles, Scooters

　　图1。LTC6803方框图

　　图2。LTC6803典型应用框图

　　图3。LTC6803简化的96节电池监视电路图

　　图4。LTC6803-4总电流为0uA的硬件关断电路方框图