The WDO of TPS3851 is used with feedback to MR.
If so, I have a few questions.
Q1.In this circuit, when WDO is asserted and MR goes "L", RESET is asserted and WDO is in a high impedance state.
The data sheet indicates that 1us is required, but actual measurement shows that RESET is asserted in about 328ns.
*WDO=MR.
In the case of this circuit, we thought it would not be a problem even if 1us was not satisfied.
The reason is that WDO is designed to assert tRST = 200ms (typ), which allows time for MR to be asserted until it detects "L".
Is this understanding correct?
Q2：I understand that MR's VIL is 0.25V.
However, as you can see from the waveform, WDO appears to clamp the voltage around 0.25V.
Considering the possibility of insufficient drive current, I increased the pull-up resistor (10kΩ) on the WDO pin and it was clamped at around 0.25V as well.
Below is the waveform when the pull-up resistor is changed from 10kΩ to 47kΩ.
We would like to assert to 0V if possible.
What could be the cause of the slight voltage?
