SLVSG51A April 2021 – February 2022 TPS23882B
PRODUCTION DATA
COMMAND = 0Fh with 1 Data Byte, Read Only
7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
REQUESTED CLASS Ch4 | DETECT Ch4 | ||||||
R-0 | R-0 | R-0 | R-0 | R-0 | R-0 | R-0 | R-0 |
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset |
Bit Descriptions: These bits represent the most recent "requested" classification and detection results for channel n. These bits are cleared when channel n is turned off.
Bit | Field | Type | Reset | Description | ||||||
---|---|---|---|---|---|---|---|---|---|---|
7–4 | RCLASS Ch-n | R | 0 | Most recent classification
result on channel n. The selection is as following: | ||||||
RCLASS Ch-n | Requested Class | |||||||||
0 | 0 | 0 | 0 | Unknown | ||||||
0 | 0 | 0 | 1 | Class 1 | ||||||
0 | 0 | 1 | 0 | Class 2 | ||||||
0 | 0 | 1 | 1 | Class 3 | ||||||
0 | 1 | 0 | 0 | Class 4 | ||||||
0 | 1 | 0 | 1 | Reserved – read as Class 0 | ||||||
0 | 1 | 1 | 0 | Class 0 | ||||||
0 | 1 | 1 | 1 | Class Overcurrent | ||||||
1 | 0 | 0 | 0 | Class 5 - 4-Pair Single Signature | ||||||
1 | 0 | 0 | 1 | Class 6 - 4-Pair Single Signature | ||||||
1 | 0 | 1 | 0 | Class 7 - 4-Pair Single Signature | ||||||
1 | 0 | 1 | 1 | Class 8 - 4-Pair Single Signature | ||||||
1 | 1 | 0 | 0 | Class 4+ - Type-1 Limited | ||||||
1 | 1 | 0 | 1 | Class 5 - 4-Pair Dual Signature | ||||||
1 | 1 | 1 | 0 | Reserved | ||||||
1 | 1 | 1 | 1 | Class Mismatch | ||||||
3–0 | DETECT Ch-n | R | 0 | Most recent detection result
on channel n. The selection is as following: | ||||||
DETECT Ch-n | Detection Status | |||||||||
0 | 0 | 0 | 0 | Unknown | ||||||
0 | 0 | 0 | 1 | Short-circuit | ||||||
0 | 0 | 1 | 0 | Reserved | ||||||
0 | 0 | 1 | 1 | Too Low | ||||||
0 | 1 | 0 | 0 | Valid | ||||||
0 | 1 | 0 | 1 | Too High | ||||||
0 | 1 | 1 | 0 | Open Circuit | ||||||
0 | 1 | 1 | 1 | Reserved | ||||||
1 | 1 | 1 | 0 | MOSFET fault | ||||||
“Requested” vs. “Assigned” Classification: The “requested” class is the classification the PSE measures during Mutual Identification prior to turn on, whereas the “assigned” class is the classification level the channel was powered on with based on the Power Allocation setting in register 0x29h. The “assigned” classification values are available in registers 0x4C-4F
Due to the need to power on after 1 class finger, the "Class 4+ - Type 1 Limited" Requested Class is reported anytime a Class 4 or higher PD is powered with register 0x29 configured for 15.5W.
Upon being powered, devices that present a class 0 signature during discovery will be given an assigned class of "Class 3"
Even though the TPS23882B is a 2-pair PSE controller, due to the use of 3-finger classification, it is still capable of identifying if a Class 5+ 4-pair PDs is connected.