參數(shù)資料
型號: MAX5945
廠商: Maxim Integrated Products, Inc.
英文描述: Quad Network Power Controller for Power-Over-LAN
中文描述: 四路網(wǎng)絡(luò)電源控制器,用于LAN供電
文件頁數(shù): 34/44頁
文件大小: 572K
代理商: MAX5945
M
Use the program registers (Table 29) to set the nominal
value for t
FAULT
and t
START
for all ports according to
the following formula:
t
FAULT
nominal = 40.96ms + 2.72ms x N
t
START
nominal = 40.96ms + 2.72ms x N
where N is the decimal value of TF_PR[3:0] or
TS_PR[3:0], respectively.
A reset sets R28h = 77h, which sets t
FAULT
= t
START
=
60ms as shown in the
Electrical Characteristics
. Use
R28h in conjunction with the two TSTART and TFAULT
bits in register R16h to program the values of t
FAULT
and t
START
from about 20ms to almost 330ms with a
2.72ms resolution.
Example: Set TF_PR[3:0] = 1111b, TFAULT[1:0] = 11b
Then:
t
FAULT
= 4 x t
FAULT
nominal
= 4 x (40.96ms + 2.72ms x 15)
= 327ms
Note:
The programmed value has the same percent-
age tolerance as the value specified in the
Electrical
Characteristics
.
Quad Network Power Controller
for Power-Over-LAN
34
______________________________________________________________________________________
ADDRESS = 28h
SYMBOL
BIT
7
6
5
4
3
2
1
0
R/W
R
R
R
R
R
R
R
R
DESCRIPTION
TF_PR[3]. t
FAULT
nominal programming bit 3.
TF_PR[2]. t
FAULT
nominal programming bit 2.
TF_PR[1]. t
FAULT
nominal programming bit 1.
TF_PR[0]. t
FAULT
nominal programming bit 0.
TS_PR[3]. t
START
nominal programming bit 3.
TS_PR[2]. t
START
nominal programming bit 2.
TS_PR[1]. t
START
nominal programming bit 1.
TS_PR[0]. t
START
nominal programming bit 0.
TF_PR
TS_PR
Table 29. Program Register 3
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