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LP877451Q1EVM: what's the status of NINT when power on

Elec Cheng

Expert 7055 points

Part Number: LP877451Q1EVM
Other Parts Discussed in Thread: AWR2944

Hi Expert,

Our customer use AWR2944 EVM for test. They find that when initially power on, the NINT is pulled down before configurating LP877451-Q1. I read datasheet and LP877451A1-Q1 TRM and find that NINT polarity is active low. So from mu understanding, LP877451-Q1 NINT is activated once power on before configuration. Is that possible? Thanks.

BR,

Elec Cheng

over 2 years ago

0 Alex Saenz over 2 years ago

TI__Expert 6700 points

Hello,

This ticket has been assigned to the appropriate engineer who should be getting back to you next week.

Regards,

Alex

0 Samuli Piispanen over 2 years ago in reply to Alex Saenz

TI__Expert 4985 points

Hi Elec,

When pulling EN high the device will generate ENABLE_INT and LBIST_DONE_INT which have to be cleared.

NINT will also be kept active as long as watchdog is enabled and not being serviced correctly.

BR,

Samuli

0 Elec Cheng over 2 years ago in reply to Samuli Piispanen

TI__Expert 7055 points

Hi Expert,

Could you please specify what is needed to be done in order to clear nINT during power up? Thanks.

BR,

Elec Cheng

0 Samuli Piispanen over 2 years ago in reply to Elec Cheng

TI__Expert 4985 points

Hi Elec,

Start servicing or disable the watchdog, clear ENABLE_INT and LBIST_DONE_INT interrupts.

BR,

Samuli