复位IC一般什么情况下要用到？现在MCU是不是一般自带复位脚外接一个电阻电容就解决了复位功能？_百度知道
复位IC一般什么情况下要用到？现在MCU是不是一般自带复位脚外接一个电阻电容就解决了复位功能？
掉电恢复期间有足够的复位时间，并不能满足恶劣条件下的复位需求;容值，MCU在复位过程中都做些什么。你需要先了解一下什么是复位，如何计算选取阻容复位电路的阻值&#47，为什么阻容电路可以保障MCU在上电&#47阻容复位电路的性能有限
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，单片机还有内部复位。即使不接也没有问题，MCU外部复位一般复位脚外接一个电阻电容就可以了。但是可靠性要求高的场合（工控类的）用复位iC
复位脚外接一个电阻电容仅是上电初始复位；有时有置位性的即时复位，一般用于外围单一或同一性质的电路。
你那种简单的复位是可以的，但是遇到复杂的情况就不行了。复位芯片就可以做到。一样的道路，一把菜刀能切肉，一把军刀也能切肉，不过就是使用寿命和锋利程度不一样而已。所以环境比较复杂，要求比较苛刻的时候（比如不能死机啊等等），就需要用到复位芯片了，它能提高你系统的稳定性和抗外界影响力。
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当前位置：&>>&&>>&&>>&超低温情况下驱动IC损坏的原因
　　针对LED显示的具体应用情况分析，在LED显示模组里，温度特性最差的是。目前，普通的电解一般标称值为零下40度，在零下40度或更低温度的时候，电解电容的特性会变得很差甚至会完全失效。这是由于在零下40度或更低温度的时候，电解电容的电解液粘度变大甚至会出现结晶现象。
　　正常情况下，LED模组上电压为5V, 在OE信号的开关作用下，电压会有波动，最高值在5.37V左右。而没有电解电容的LED模组，在OE信号的控制下，电源上出现很高的毛刺，最高电压达到10.8V甚至更高。这个电压已经大大超过了IC电源正常所允许的电压，目前的恒流源驱动的逻辑部分工作电压为5V,要求电源上不能出现超过7V的毛刺。高压毛刺会导致IC内部逻辑部分的MOS器件击穿，从而导致IC失效。
　　针对电容失效的问题，以下措施可解决问题。
　　1. 针对特别寒冷的地区，模组上采用或加装 -55度的低温电解电容，这样在零下40-45度时（查阅气象资料，近年东北的部分区域，冬季最冷的时候最低温度在-40到-45度之间），电容仍能正常工作。另外，钽电容具有非常好的低温特性，针对气候寒冷地区的，可以在LED模组上加装1-2个钽电容，以保证低温下良好的滤波特性。
　　2. 在显示屏内加装温控装置和空调或加热装置。温控系统确保显示屏在超低温状态下无法开机。在冬天严寒天气时，在显示屏开机之前，通过空调系统或加热装置，提前一段时间（1-2个小时），对显示屏内部进行加热，使屏内温度在零下25度以上，然后再打开显示屏电源。
　　3. 在单元模组PCB上或电源接线柱上加一个瞬态电压抑制（Transient Voltage Suppressor）简称TVS。TVS是一种二极管形式的高效能保护器件。当模组在超低温电容失效的情况下，能吸收高压毛刺，避免板上器件受到损坏。TVS二极管的钳位电压可以选择在7.0V左右。
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