SLUSC25A February 2015 – August 2017 TPS2388
PRODUCTION DATA.
COMMAND = 1Fh with 1 Data Byte, Read/Write
Replaces the ICUT mechanism. The threshold is defined with the Police bits and the PoE Plus register.
7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
POL4_3 | POL4_2 | POL4_1 | POL4_0 | POL3_3 | POL3_2 | POL3_1 | POL3_0 |
R/W-1 | R/W-1 | R/W-1 | R/W-1 | R/W-1 | R/W-1 | R/W-1 | R/W1 |
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset |
Bit | Field | Type | Reset | Description |
---|---|---|---|---|
7–0 | POLn_3- POLn_0 | R/W | 1 | 4-bit nibble defining ICUT threshold. The result varies depending on the PoE Plus port bit. The equation defining the ICUT threshold is: ICUT = (N × ICSTEP) + ICOFFS Where, when assuming 0.255-Ω Rsense resistor is used: ICSTEP = 20 mA (1 W resolution if at 50 V) when the associated port’s PoE Plus bit is 0 ICSTEP = 40 mA (2 W resolution if at 50 V)when the associated port’s PoE Plus bit is 1 and: ICOFFS = 20 mA when the associated port’s PoE Plus bit is 0 ICOFFS = 320 mA (16 W if at 50 V) when the associated port’s PoE Plus bit is 1 Note: When a PoEPn bit is set in PoE Plus register, the corresponding POLn bits are initially changed to 0x0. When a PoEPn bit is reset in PoE Plus register, the corresponding POLn bits are initially changed to 0xF. In both cases, the port police current threshold is the same value. |