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Quad, IEEE 802.3at/af PSE Controller
for Power-over-Ethernet
TLIM Programming Registers (R1Eh and R1Fh)
The TLIM Programming registers (R1Eh/R1Fh, Table 30)
are used to adjust the t LIM current-limit timeout duration.
On a power-up or after a reset condition, this register is
set to a default value of 00h. When TLIM_[3:0] is set to
0000 the default t LIM timeout is 60ms (typ). When set to
any other value, the t LIM timeout is set to 1.71ms times
the decimal value of TLIM_[3:0].
Maxim Reserved Registers (R20h–R2Fh)
Maxim Reserved Registers (R20h–R28h, R2Ah–R2Fh)
These registers are reserved. Writing to these registers
is not recommended as they are internally connected. If
the software needs to do a large batch write command
using the address autoincrement function, write a code
Table 30. TLI M Programming Registers
of 0x00h to these registers to safely autoincrement past
them, and then continue the write commands as normal.
Miscellaneous Configuration 2 Register (R29h)
The Miscellaneous Configuration 2 register (Table 31) is
used for several functions that do not cleanly fit within
one of the other configuration categories. On a power-up
or after a reset condition, this register is set to a default
value of 00h. When LSC_EN is set to 1, the load stabil-
ity safety check is enabled and the detection phase is
more immune to load variation. When VEE_R_ are set to
1, V EE voltage conversion is enabled for the respective
port, and the result overwrites the port voltage result in
the corresponding port voltage registers.
ADDRESS = 1Eh/1Fh
SYMBOL BIT NO.
7
TYPE
R/W
DESCRIPTION
TLIM2/4[3:0]
TLIM1/3[3:0]
6
5
4
3
2
1
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
TLIM timer setting for port 2/4 (1Eh/1Fh)
TLIM timer setting for port 1/3 (1Eh/1Fh)
Table 31. Miscellaneous Configuration 2 Register
ADDRESS = 29h
SYMBOL BIT NO.
TYPE
DESCRIPTION
Reserved
Reserved
Reserved
LSC_EN
VEE_R4
VEE_R3
VEE_R2
VEE_R1
7
6
5
4
3
2
1
0
—
—
—
R/W
R/W
R/W
R/W
R/W
Reserved
Reserved
Reserved
Set to 1 to enable the load stability safety check
Enable V EE voltage readout for port 4
Enable V EE voltage readout for port 3
Enable V EE voltage readout for port 2
Enable V EE voltage readout for port 1
41
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