If I want power on STuW81300 forever, should I connect Pin4 PW-PD to ground

[Timothy Luo]

I would like to power STuW81300 forever, should I connect Pin4 PW-PD to ground?

Thank you

Regards,

Tim

[Peter BENSCH · Accepted solution]

Welcome, @Timothy Luo​, to the community!

Yes, if you set HW_PD to 0 (GND), the STuW81300 is permanently active.

HW_PD to 1 would activate the power down function and disable the device.

Regards

/Peter

[Timothy Luo]

Hi, Peter,

Thank you very much for your quick reply. I have few more questions. I would like to use STuW81300 to generate 14GHz signal. Based on my understanding, we should power down RF1 stage and power RF2 stage. Please see following Schematic:

Could you review the above Schematic? Can we leave RF1_OUTN and RF1_OUTP open when we do not use them? Should we connect 3.3V to PDRF1 to power down RF1 output and PDRF2 to GND to power up the RF2?

Thank you in advance.

Best regards,

Tim

[Peter BENSCH]

Yes, leave RF1_OUTN and RF1_OUTP open when unused.

Yes, PD_RF1 and PD_RF2 can be connected this way if you do not use the alternative and enable/disable the outputs by software. Please pay attention to this:

• register ST7, bit 18 (FSTLCK_EN)
• register ST8, bit 26 (PD_RF2_DISABLE)

Normally, only one question should be asked and answered in a thread, so that other readers are not put off by threads that go on for ages. Therefore, please open a new thread for further questions.

Good luck!

If the problem is resolved, please mark this topic as answered by selecting Select as best. This will help other users find that answer faster.

/Peter

[Timothy Luo]

Will do.