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参数资料
| 型号： | NCP1083DEG |
| 厂商： | ON Semiconductor |
| 文件页数： | 12/18页 |
| 文件大小： | 257K |
| 描述： | IC CONV CTLR POE-PD 40W 20-TSSOP |
| 标准包装： | 74 |
| 类型： | 以太网供电开关（PoE） |
| 应用： | 远程外设（工业控制，相机，数据访问） |
| 内部开关： | 是 |
| 电流限制： | 1.1A |
| 电源电压： | 0 V ~ 57 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-TSSOP（0.173"，4.40mm 宽）裸露焊盘 |
| 供应商设备封装： | 20-TSSOP-EP |
| 包装： | 管件 |
NCP1083
http://onsemi.com
12
1st Class Event
Class range
Mark Range
Reset Range
2 Fingers Classification
0 V
5.4 V
9.7 V
13 V
20.5 V
UVLO_on
Power On
Detection
PSE identified as type 2 PSE (at)
PSE identified by default as type 1 PSE (af)
PSE Type identification:
Number of Mark Event:
0
1
2
X
Operation Mode:
Figure 9. Hardware Physical Classification Event Sequence
with Mark Events (.at spec)
1st Mark Event 2nd Class Event 2nd Mark Event
nCLASS_AT Indicator
The nCLASS_AT active low open drain output pin can be
used to notify to the microprocessor of the powered device
that the PSE performed a one or two event hardware
classification. If a two event hardware classification has
occured and once the PD application is supplied power by
the NCP1083 DC-DC converter, the nCLASS_AT pin will
be pulled down to ARTN by the internal low voltage NMOS
switch (ARTN is the ground connection of the DC-DC
converter). Otherwise, nCLASS_AT will be disabled and
will be pulled up to VDDL (3.3 V typ) via an internal current
source (20 mA typ) and via the external pull-up resistor.
The following scheme illustrates how the nCLASS_AT
pin may be configured with the processor of the powered
device. An opto-coupler is used to guarantee full isolation
between the Ethernet cable and the application.
Figure 10. Isolated nClass_AT Communication with the Powered Device Application
As soon as the application is powered by the DC-DC
converter and completes initialization, the microprocessor
should check if the NCP1083 detected a two event hardware
classification by reading its digital input (pin IN1 in this
example). If pin IN1 is low, the application knows power is
supplied by a IEEE 802.3at compliant PSE, and can deliver
power up to the level specified by the IEEE 802.3at standard.
Otherwise the application will have to perform a Layer 2
classification with the PSE. There are several scenarios for
which the NCP1083 will not enable its nCLASS_AT pin:
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