参数资料
型号: MAX5952AEAX+T
厂商: Maxim Integrated
文件页数: 41/50页
文件大小: 1006K
描述: IC PSE CTRLR FOR POE 36-SSOP
产品培训模块: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
标准包装: 1,000
类型: 以太网供电控制器(PoE)
应用: 远程外设(工业控制,相机,数据访问)
内部开关:
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 36-BSOP(0.295",7.50mm 宽)
供应商设备封装: 36-SSOP
包装: 带卷 (TR)
High-Power, Quad, PSE Controller
for Power-Over-Ethernet
______________________________________________________________________________________   41
The MAX5952 provides current readout for each port
during classification and normal power mode. The cur-
rent per port information is separated into 9 bits. They
are organized into 2 consecutive registers for each one
of the ports. The information can be quickly retrieved
using the auto-increment option of the address pointer.
To avoid the LSB register changing while reading the
MSB, the information is frozen once the addressing
byte points to any of the current readout registers.
During power mode, the current value can be calculat-
ed as
I
PORT
= N
IPD_
x 1.953125mA
During classification, the current is
I
CLASS
= N
IPD_
x 0.0975mA
where N
IPD_
is the decimal value of the 9-bit word. The
ADC saturates both at full scale and at zero. A reset
sets R30hR37h = 00h.
Table 34c. ICUT Register Bit Values for Current-Limit Threshold
ICUT_[2:0] (ADDRESS = 2Ah, 2Bh)
SCALE FACTOR
TYPICAL CURRENT-LIMIT THRESHOLD (mA)
000
1x
375
001
1.5x
563
010
1.75x
656
011
2x
750
100
2.25x
844
101
2.5x
938
110
0.3x
Class 1
111
0.53x
Class 2
Table 35. Classification Status Registers
ADDRESS = 2Ch, 2Dh, 2Eh, 2Fh
SYMBOL
BIT
R/W
DESCRIPTION
7

Reserved
Reserved
6

Reserved
ADDRESS = 30h, 31h, 32h, 33h, 34h,
35h, 36h, 37h
SYMBOL
BIT
R/W
DESCRIPTION
7
W
IPD_[8]
6
W
IPD_[7]
5
W
IPD_[6]
4
W
IPD_[5]
3
W
IPD_[4]
2
W
IPD_[3]
1
W
IPD_[2]
IPD_
0
W
IPD_[1]/IPD_[0]
Table 36. Current Registers
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