SLUSBX9I March 2014 – July 2019 TPS23861
The detect resistance can be measured and reported in the Port n Detect Resistance Register. Fourteen bits of resistance information are reported in two bytes. Useful range of measurement is 500 Ω to 55 kΩ. Resolution (1 LSB) is approximately 11 Ω. Measurement repeatability is on the order of ±200 Ω. Additionally, in the MSB of the resistance register (Port n Resistance: MSByte) the RSn field reports whether a low-resistance circuit, open circuit or MOSFET short fault is detected.
Before detection begins, the TPS23861 backs-off for up to 400 ms to allow the port voltage to drop below 2.8 V. This will allow any PD on the port to reset prior to an attempt to detect, classify and apply power to the PD.
|RSn1||RSn0||DETECT STATUS||RSTEP BIT WEIGHT|
|0||1||Low (< 2 kΩ)||Additional detect 4.625 Ω/bit|
|1||1||MOSFET short fault||N/A|