Power Management中的主题 Re: VR5510 Watchdog Disable Mode

VR5510 Watchdog Disable Mode

Schavan — Thu, 11 May 2023 05:36:39 GMT

Hello NXP Community

We are using S32G controller and VR5510 in our project. We wanted to debug the software using Lauterbach debugger by applying breakpoints. During this time, we don't want to have any watchdog reset.

Some SBCs comes with separate PIN as debug/Test pin and if we connect some voltage on that pin then watchdog get disable.

is VR5510 have such provision to disable watchdog for SW debugging?

Re: VR5510 Watchdog Disable Mode

guoweisun — Thu, 11 May 2023 05:47:24 GMT

Please read datasheet page18-8.12 Entering Debug mode using the VDDOTP pin

Debug mode don't need WD refresh.

Re: VR5510 Watchdog Disable Mode

Schavan — Thu, 11 May 2023 05:56:40 GMT

The above image shows that after applying 0V to VDDOTP pin, the device starts with OTP configuration (If done) and starts all its regulators. Does device continue in debug mode from this point and do not require watchdog refreshing? @guoweisun

Re: VR5510 Watchdog Disable Mode

guoweisun — Thu, 11 May 2023 06:08:45 GMT

For the detail please see page21:

Re: VR5510 Watchdog Disable Mode

Schavan — Thu, 11 May 2023 07:27:12 GMT

IN above flow chart the command DBG_EXIT will exit the VR5510 from debug mode and here after it is mandatory to refresh the watchdog as device is not in debug mode. is this understanding, correct?

if this is the case then adding breakpoint in the debugger will result into a watchdog reset which we want to avoid.

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