AWR2944EVM: Why warm_reset behave like this?

Hi,

The purpose of warm reset (open drain pin) going low is to indicate the time the MMIC sees stable DC power, and MSS Boot Starts.  See start-up diagram below.

Pin description in datasheet:

"Open drain fail safe warm reset signal. Can be driven from PMIC for diagnostic or can be used as status signal that the device is going through reset."

Let me know if you need more clarification.

regards,

Ali

Hi Ali,

I know description of  warm_resert Pin in data sheet.

As you can see in the figure you provide, the current level of warm_reset has a change from low to high after power on, but it keeps high current level when I test it.

Besides, the voltage of device is normal.

I want to know if it will result in something unpredictable and how to make it behave currently.

Regards,

Zisheng Wang

Hi Zisheng,

So you never see warm reset go low?  Please capture power rail, NRESET and WARMRST on scope.  Can you communicate with device over USB?  Are you using mmWaveStudio?

regards,

Ali

Hi Ali

Below are result captured:

It should behave like left, but like right.

does it metter?

Regards,

Zisheng

Hi,

That does not look like normal operation for WARM RESET.  After power up, can you communicate with AWR2944? Are you usinf mmWaveStudio?  Or OOB demo?   

regards,

Ali