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MAX809R是一款专为微处理器(MCU)、微控制器(MPU) 设计的低功耗电压检测器,核心作用是实现上电复位(POR) 和掉电复位(BOD) ——在系统上电时确保MCU稳定启动,在电源电压跌落时及时拉低复位电平,防止MCU因电压不足出现误操作或程序跑飞。其宽电压范围、低静态电流与工业级温度适应性,使其成为便携式设备、工业控制、消费电子等领域的常用复位方案。
MAX809R的关键参数精准匹配低功耗系统需求,具体如下:
参数项 典型值/范围 实际应用说明 工作电压范围 1V ~ 6V 覆盖3.3V、5V等常见MCU供电,适配低功耗(1V起)与标准电压系统 复位阈值电压 2.63V(±1%精度) 精准监控电源,确保电压低于阈值时触发复位,避免MCU在临界电压下运行 输出类型 推挽输出 无需上拉电阻,直接驱动MCU复位引脚,简化电路设计 复位有效电平 低电平有效 兼容大多数MCU的复位逻辑(复位时拉低,稳定后拉高) 复位超时时间 500ms(典型值) 足够MCU完成寄存器初始化、程序加载,避免上电初期误运行 静态电流(Iq) 2μA(典型值) 极低功耗,并联在电源端不增加系统负担,适合电池供电场景 受监控通道 1通道 单电源监控,满足单MCU系统的复位需求系统上电时,电源电压从0逐渐上升:
当电源电压因负载变化、电池耗尽跌落至2.63V以下时:
采用SOT-23-3封装(3引脚),引脚定义清晰:
MAX809R的特性使其适用于以下场景:
MAX809R符合工业级标准,具备:
综上,MAX809R以低功耗、宽适配、高可靠的特点,成为MCU系统复位设计的经典选择,尤其适合对功耗和空间敏感的应用场景。
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