LPC546xx with 1.8V design and USB

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LPC546xx with 1.8V design and USB

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RU
Contributor I

I want to start a LPC546xx design with 1.8V - how can i use USB0?

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xiangjun_rong
NXP TechSupport
NXP TechSupport

Hi,

First of all, pls download the data sheet of LPC546xx from the link:

https://www.nxp.com.cn/docs/en/data-sheet/LPC546XX.pdf

As the following screenshot from above data sheet, you can see that

typical voltage of USB1_AVDD3V3,USB1_AVDDTX3V3 pins are 3.3V

The VDD is from 1.71 to 3.6V, but if you use USB, you have to meet the following condition:

For USB full-speed operation only 3.0 - 3.6 V
For USB high-speed operation only 1.71 - 3.6 V

the VDDA is from 1.71 to 3.6V.

 

 

xiangjun_rong_0-1657851775481.png

Hope it can help you

BR

XiangJun Rong

 

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444 Views
RU
Contributor I

Table 12 says for VDD 1.71V .. 3.6V for USB high speed only. According to this, USB would work with 1.8V.

On the other hand, table 21 shows quite contradictory values. Is USB now possible with 1.8V?

RU_0-1659700050452.png

 

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xiangjun_rong
NXP TechSupport
NXP TechSupport

Hi,

I think it is correct:

The VDD is from 1.71 to 3.6V, but if you use USB, you have to meet the following condition:

For USB full-speed operation only 3.0 - 3.6 V
For USB high-speed operation only 1.71 - 3.6 V

 

Hope it can help you

BR

XiangJun Rong

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