参数资料
| 型号： | MAX5980EVKIT# |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 17/49页 |
| 文件大小： | 0K |
| 描述： | EVAL KIT MAX5980 |
| 标准包装： | 1 |
| 系列： | * |
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Quad, IEEE 802.3at/af PSE Controller
for Power-over-Ethernet
To prevent damage to non-PD devices, and to protect
itself from an output short circuit, the device limits the
current into OUT_ to less than 2mA (max) during PD
detection. In midspan mode, after every failed detection
cycle, the device waits at least 2.0s before attempting
another detection cycle.
High-Capacitance Detection
High-capacitance detection for legacy PDs is soft-
ware programmable. To use the software to enable
high-capacitance detection, set LEG_EN_ (Port GPMD
registers, Table 39) to 1 during normal operation. If high-
capacitance detection is enabled, PD signature capaci-
tances up to 100 F F (typ) are accepted.
Power Device Classification
(PD Classification)
During PD classification, the device forces a probe volt-
age between 15V and 20V at OUT_ and measures the
current into OUT_. The measured current determines the
class of the PD.
After each classification cycle, the device sets
CLS_ (R04h[7:4] and R05h[7:4], Table 9) to 1 and reports
the classification results in the classification status bits
(see Table 13). The CLS_ bits are reset to 0 when read
If EN_CL5 is left unconnected, the device will classify the
PD based on Table 33-9 of the IEEE 802.3at standard
(see Table 2). If the measured current exceeds 51mA,
the device will not power the PD, but will report an over-
current classification result and will return to IDLE state
before attempting a new detection cycle.
Class 5 PD Classification
The device supports high power beyond the IEEE
802.3at standard by providing an additional classifica-
tion (Class 5) if needed. To enable Class 5, connect
EN_CL5 to V DD and initiate a global reset or use the soft-
ware to individually enable Class 5 classification for each
port (R1Ch[3:0], Table 29). Once Class 5 is enabled,
during classification, if the device detects currents in
excess of the Class 4 upper-limit threshold, the PD will
be classified as a Class 5 powered device. The PD is
guaranteed to be classified as a Class 5 device for any
classification current from 51mA up to the classification
current-limit threshold. The Class 5 overcurrent threshold
and current limit will be set automatically with ICUT_[5:0]
and ILIM_ (see Tables 40 and 41). Leave EN_CL5
unconnected to disable Class 5 detection and to be fully
compliant to IEEE 802.3at standard classification.
through the CoR (clear on read) register (R05h) or after
a reset event.
Table 2. PSE Classification of a PD (Table 33-9 of the IEEE 802.3at Standard)
MEASURED I CLASS (mA)
0 to 5
> 5 and < 8
8 to 13
> 13 and < 16
16 to 21
> 21 and < 25
25 to 31
> 31 and < 35
35 to 45
> 45 and < 51
CLASSIFICATION
Class 0
May be Class 0 or 1
Class 1
Either Class 1 or 2
Class 2
Either Class 2 or 3
Class 3
Either Class 3 or 4
Class 4
Either Class 4 or Invalid
17
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| MAX5980GTJ+ | 功能描述:电源开关 IC - POE / LAN 0-16V Hot-Swap Controller RoHS:否 制造商:Fairchild Semiconductor 开关数量:Single 开关配置:SPST 开启电阻（最大值）:7.3 Ohms 串话: 带宽: 开启时间（最大值）:13 ns 关闭时间（最大值）:20 ns 切换电压（最大）: 工作电源电压:8 V to 26 V 最大工作温度:+ 125 C 安装风格:Through Hole 封装 / 箱体:TO-220F-6 |
| MAX5980GTJ+T | 功能描述:电源开关 IC - POE / LAN 0-16V Hot-Swap Controller RoHS:否 制造商:Fairchild Semiconductor 开关数量:Single 开关配置:SPST 开启电阻（最大值）:7.3 Ohms 串话: 带宽: 开启时间（最大值）:13 ns 关闭时间（最大值）:20 ns 切换电压（最大）: 工作电源电压:8 V to 26 V 最大工作温度:+ 125 C 安装风格:Through Hole 封装 / 箱体:TO-220F-6 |
| MAX5980UTJ+ | 功能描述:电源开关 IC - POE / LAN 0-16V Hot-Swap Controller RoHS:否 制造商:Fairchild Semiconductor 开关数量:Single 开关配置:SPST 开启电阻（最大值）:7.3 Ohms 串话: 带宽: 开启时间（最大值）:13 ns 关闭时间（最大值）:20 ns 切换电压（最大）: 工作电源电压:8 V to 26 V 最大工作温度:+ 125 C 安装风格:Through Hole 封装 / 箱体:TO-220F-6 |
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