[原创]ADI LTC3337内置精密库仑计数器的原电池健康状态(SOH)监视方案

ADI公司的LTC3337是具有内置精密库仑计数器的原电池健康状态 (SOH) 监视器,设计为与原电池串联,相关串联电压降很小.获得专利的无限动态范围库仑计数器记录所有累积的电池放电,并将其存储在可通过 I2C 接口访问的内部寄存器中.基于此充电状态 (SOC) 的放电警报阈值可编程.当达到阈值时,IRQ引脚产生中断.库仑计数器的精度低至空载也保持恒定.LTC3337还集成了额外的SOH监控,并通过I2C测量和报告电池电压,电池阻抗和温度.电池输入电压范围为1.8V到5.5V,静态电流为100nA,8个原电池峰值电流限值为5mA/10mA/15mA/20mA/25mA/50mA/75mA/100mA.器件集成了±10mA超级电容平衡器.采用微型12引脚2mmx2mm LFCSP封装.主要用在远程工业传感器如仪表和警报等,资产跟踪器, 电子门锁,SmartMesh®应用, “保护有效”电源/备用电池.本文介绍了LTC3337主要特性,框图和多种应用电路,以及演示板DC2973A主要特性,快速建立图,电路图,材料清单和PCB设计图.

The LTCR3337 is a primary battery state of health (SOH)monitor with a built-in precision coulomb counter. It isdesigned to be placed in series with a primary batterywith minimal associated series voltage drop. The patentedinfinite dynamic range coulomb counter tallies ALLaccumulated battery discharge and stores it in an internalregister accessible via an I2C interface. A discharge alarmthreshold based on this state of charge (SOC) is programmable.

When it is reached, an interrupt is generated atthe IRQ pin. Coulomb counter accuracy is constant downto no load.

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