TMS320F28379 RC复位电路，注意事项有哪些？

"使用tms320f29379推荐电路使用TPS3895ADRYT作为复位电路时，主板工作正常，但是由于TPS3895ADRYT封装问题，太难焊接，目前取消TPS3895ADRYT，改用RC电路后，发现设备上电后设备不工作，用镊子短接RC电路的电容，设备可以工作；GPIO72\GPIO84均上拉，目前R=10k 、C=100nf；"
ERIC:
首先，看一下你的电源上电时序，保证如下的上电要求。另外，你可以试着把上拉电阻改小到5K。
"The voltage on VDDIO should be greater than VDD or no less than 0.3 V below VDD at all times. VDDIO,
V
DD3VFL, VDDOSC, and VDDA should be powered up together and be kept within 0.3 V of each other during
operation. Before powering the device, no voltage larger than 0.3 V above VDDIO should be applied to any
digital pin, and no voltage larger than 0.3 V above VDDA should be applied to any analog pin.
An internal power-on-reset (POR) circuit holds the device in reset and keeps the I/Os in a high-impedance
state during power up. External supply voltage supervisors (SVS) can be used to monitor the voltage on
the 3.3-V and 1.2-V rails and drive XRS low should supplies fall outside operational specifications."

RC只能实现上电自复位 也就是在上电电容充电瞬间实现低到高的变化
你可以增大电容值看看 有没有改善
复位电路比较可靠 主要是确保电源准备好 并且可以延时 持续 复位信号