OMAPL138 Short Circuit Withstand Capability of USB2.0 Port

Toshio Ushikubo

Other Parts Discussed in Thread: OMAPL138

Please advicer if OMAPL138 USB2.0 port satisfy "Short Circuit Withstand" capability of attached USB2.0 specification page 124.

Reagards,

7444.usb_20.pdf

over 14 years ago

0 clam over 14 years ago

TI__Expert 8785 points

I believe the USB2.0 PHY supports "short circuit", but I'm waiting for the experts to confirm. When I receive a reply back, I'll repost back here.

--Christina

0 clam over 14 years ago in reply to clam

TI__Expert 8785 points

I got some confirmation from the experts.

Question: Does OMAPL138 comply with the "D+/D- short VBUS and GND" USB2.0 requirement for minimum 24 hours?
Answer: Yes. However, on the OMAPL138 device, there is no charge detection (i.e., the controller does not know that it is charging)

--Christina

0 Toshio Ushikubo over 14 years ago in reply to clam

Mastermind 9620 points

Thank you for the answer about Short Circuit Withstand.

Please let me known the meaning of "there is no charge detection".

I searched the key word "charge detection" in the USB2.0 specification revission2.0,

but I can't find the keyword.

Regards.

0 swami over 14 years ago in reply to Toshio Ushikubo

TI__Expert 7435 points

charge detection is a feature in which the controller knows that it is enabling charging of onboard battery. This feature is not supported on L138.

regards

swami

0 Mukul Bhatnagar over 14 years ago in reply to swami

TI__Guru* 83815 points

Charge port detection description is in the battery charging specifications , that you can find here

http://www.usb.org/developers/devclass_docs

Regards

Mukul

0 Toshio Ushikubo over 14 years ago in reply to Mukul Bhatnagar

Mastermind 9620 points

Thank you for your answer.

Regards.

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OMAPL138 Short Circuit Withstand Capability of USB2.0 Port