AWR2944EVM: AWR2944EVM

siyuan.yao

Part Number: AWR2944EVM
Other Parts Discussed in Thread: AWR2944, LP87745

I have a question on TI AWR2944 EVM schematic. It seems like CS_SPI/WD_DIS pin is always 0.59V(3.3V divided by 10K and 2.2K). WD can not be disable. Would you please check whether it is true? Or the EVM PMIC disabled WD in OTP?

over 1 year ago

0 siyuan.yao over 1 year ago

Prodigy 90 points

CS_SPI/WD_DIS is the pin of PMIC LP87745

0 Josh Wyatt over 1 year ago in reply to siyuan.yao

TI__Guru* 91206 points

Dear Siyuan -

Thanks for the post and welcome to E2E!

Sorry for the delay - the CS_SPI pin on the PMIC has a 2.2k pulldown. The SPDT switch it is connected to has the RSV package, so pin 12 is by default connected to V+, so this is not a voltage divider, this is pulling the CS_SPI pin to V+, which means it is not used. See page 4 of the PMIC datasheet.

https://www.ti.com/lit/ds/symlink/lp87745-q1.pdf

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AWR2944EVM: AWR2944EVM