Purpose of USB_RTUNE resistor
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WGF2Intra
- Newbie
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- Joined: Tue Nov 15, 2016 7:54 pm
Purpose of USB_RTUNE resistor
The XEF216-512-TQ128 datasheet specifies (on page 17) that a 43.2 Ohm, 1% pull-down resistor should connect USB_RTUNE to ground. What is the purpose of this resistor? Is it needed if the USB PHY is not being used?
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henkVerified
- Respected Member
- Posts: 347
- Joined: Wed Jan 27, 2016 5:21 pm
Hi WGF2Intra,
That resistor is needed to make the USB PHY operate properly. You can omit it if you never enable the USB PHY.
Cheers,
Henk
That resistor is needed to make the USB PHY operate properly. You can omit it if you never enable the USB PHY.
Cheers,
Henk
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infiniteimprobability
Verified - XCore Legend
- Posts: 1164
- Joined: Thu May 27, 2010 10:08 am
If you're interested, the specific reason for the resistor is a precise reference resistance for the termination circuitry inside the PHY...