MAX5980GTJ+T Maxim Integrated, MAX5980GTJ+T Datasheet - Page 43

• Manufacturer Part Number: MAX5980GTJ+T
• Description: Power Switch ICs - POE / LAN 0-16V Hot-Swap Controller
• Manufacturer: Maxim Integrated

Specifications of MAX5980GTJ+T

• Rohs: yes
• Number Of Switches: Quad
• Off Time (max): 0.1 ms
• Operating Supply Voltage: 32 V to 60 V
• Maximum Operating Temperature: + 105 C
• Mounting Style: SMD/SMT
• Maximum Power Dissipation: 2758.6 mW
• Minimum Operating Temperature: - 40 C
• Operating Supply Current: 5 mA

Table 34. Port Voltage Register (LSB)
Table 35. Port Voltage Register (MSB)
The Port Voltage registers (Tables 34 and 35) provide
port voltage readout when a port is powered on. On
a power-up or after a reset condition, these registers
are both set to a default value of 00h. The Port Voltage
Readout registers have 16 total bits, but the 2 highest
bits (MSBs) and the 5 lowest bits (LSBs) are hardwired
to 0. The port voltage readout has 9 bits of overall actual
resolution. To avoid the LSB register changing while
ADDRESS = 33h, 37h, 3Bh, 3Fh
ADDRESS = 32h, 36h, 3Ah, 3Eh
VP_[15:8]
Port Voltage Registers (R32h, R33h, R36h, R37h,
SYMBOL
SYMBOL
VP_[7:0]
BIT NO.
BIT NO.
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
R3Ah, R3Bh, R3Eh, and R3Fh)
Quad, IEEE 802.3at/af PSE Controller
TYPE
TYPE
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
VP_[15:8] (LSB). Lower 8 bits of the 16-bit port current readout. VP_[15:13] are con-
figured to be hardwired to 0.
VP_[7:0] (LSB). Lower 8 bits of the 16-bit port current readout. VP_[4:0] are config-
ured to be hardwired to 0.
for Power-over-Ethernet
reading the MSB, the register contents are frozen if
addressing byte points to either of the Voltage Readout
registers. During normal operation, the port output volt-
age can be calculated as:
where N
age readout. The ADC saturates both at full scale and at
zero, resulting in poor voltage readout accuracy near the
top and bottom codes.
VP_
DESCRIPTION
DESCRIPTION
V
is the decimal value of the 16-bit port volt-
OUT_
= N
VP_
x 5.835mV/count
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