We have customer using TUSb1211+BQ24157 in tablet project.
Some usb wire working correct. Some usb wire cannot work correct for charge.
Plug in USB, TUSB1211 will give SOC following information: SDPàunknownàSDP, how to avoid TUSB1211 give Unknow information?
following is test waveform, blue Vbus, yellow DP, pink DM.
Abnormal:
Normal:
why abnormal waveform have defferent voltage level?
regards,
Jeff