USB XMC4700 use as Host (pull-down are active in host mode?)

Tip / Sign in to post questions, reply, level up, and achieve exciting badges. Know more

cross mob
User13334
Level 2
Level 2
Unfortunately, I can only guess the switch-on of the pull-downs in host mode implicitly from the data sheet.
According the USB physical layer specification, I know a 15kohm pull down must be implemented for speed
detection (see picture below)

3351.attach

In the data sheet the pull down are specified

3352.attach.

Now my question:

Do I have to explicitly activate the pull-down or is it sufficient to operate the peripheral in host mode?

Best regards

EbbeSand
0 Likes
2 Replies
MichaelIFX
Employee
Employee
50 replies posted 25 replies posted 10 replies posted
Depending on the Speed mode they are activated accordingly.

Kind Regards

Michael
0 Likes
User13334
Level 2
Level 2
Hello Michael

I use maximal Full Speed for the USB Interface
An therefore my question If I config the Interface to Full Speed Master the USB-IP set the pull
down on the D+ and D- line in Hardware and set the pull ups to inactive, because These resistore
are only use if the XMC is used as a device and not as host. Correct?

Best regards

EbbeSand
0 Likes