We are using the TPS2511 for a dedicated charging port for a certified USB device. In 2015 the device passed USB DCP certifications without issue, subsequent testing with the same design in 2017 yielded failures on multiple protocols including: resistance between D+ and D-, and both primary/secondary detection of D+/D- (supposed to be 0.6V nominal). The design we inherited contains only a common mode choke on the D+/D- lines and some low capacitance ESD diodes. What would cause the TPS2511 from providing erroneous values on the D+/D- signals using identical circuits? The date codes on the TPS2511’s are 4A and 61.
Thanks,
Vichet
