Wireless MCU中的主题 Re: QN9021 DC-to-DC behavior

QN9021 DC-to-DC behavior

jaimemartinez — Wed, 29 Mar 2017 17:16:47 GMT

I am seeing large, nearly 1 volt drops on the QN9021's VDD (with the DC-to-DC active) during transmits with TX gain of 0 dBm. Is this behavior normal?

Re: QN9021 DC-to-DC behavior

mario_castaneda — Wed, 12 Apr 2017 20:11:27 GMT

Hi Jaime,

What is the power supply? A battery or other equipment.

Best Regards,

Mario

Re: QN9021 DC-to-DC behavior

jaimemartinez — Thu, 13 Apr 2017 17:00:34 GMT

Normally, a small 3v lithium coin cell battery. But the drops are present with a bench top power supply as well.

Re: QN9021 DC-to-DC behavior

mario_castaneda — Tue, 18 Apr 2017 20:39:46 GMT

Hi Jaime,

What’s capacity of the battery?
Have they tried on a standard power source?
Is there any other device on their board which need more current?
Have them measure the maximum current consume by their board?

9020 MiniDK can be powered by CR2032.

Did you have the same issue on the MiniDK?

Best Regards,

Mario