MAX5945CAX+T Maxim Integrated Products, MAX5945CAX+T Datasheet - Page 33

• Manufacturer Part Number: MAX5945CAX+T
• Description: IC NETWORK PWR CTRL 36-SSOP
• Manufacturer: Maxim Integrated Products

Specifications of MAX5945CAX+T

• Controller Type: Network Power Controller
• Interface: I²C
• Voltage - Supply: 3.3V
• Current - Supply: 4.2mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 36-SSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 27. Program Register 1
Table 28. Program Register 2
Use TF_PR[3:0] to set the nominal value for t
according to the following formula:
where N is the decimal value of the binary words
TF_PR[3:0].
A reset sets R27h = 47h, which sets t
350ms as shown in the Electrical Characteristics. Use
R27h in conjunction with the two TDISC[1:0] bits in reg-
ister R16h to program the values of t
almost 340ms with a 16ms resolution.
OSCF_RS
SYMBOL
DET_BYP
SYMBOL
AC_TH
TD_PR
IGATE
IMAX
ADDRESS = 23h
ADDRESS = 27h
t
DISC
BIT
BIT
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
nominal = 238ms + 16ms x N
______________________________________________________________________________________
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R
R
R
R
R
R
R
R
IMAX[3]. V
IMAX[2]. V
IMAX[1]. V
IMAX[0]. V
TD_PR[3]. t
TD_PR [2]. t
TD_PR [1]. t
TD_PR [0]. t
IGATE[2]
IGATE[1]
IGATE[0]
Detect bypass protection in AUTO mode
OSC_FAIL Reset Bit
AC_TH[2]
AC_TH[1]
AC_TH[0]
DISC
Quad Network Power Controller
DISC
SU_LIM
SU_LIM
SU_LIM
SU_LIM
DISC
DISC
DISC
DISC
from 60ms to
nominal =
nominal programming bit 3.
nominal programming bit 2.
nominal programming bit 1.
nominal programming bit 0.
programming bit 3.
programming bit 2.
programming bit 1.
programming bit 0.
DISC
Example: Set TD_PR[3:0] = 1111b, TDISC[1:0] = 11b
Then:
Note: The programmed value has the same percent-
age tolerance as the value specified in the Electrical
Characteristics.
DESCRIPTION
DESCRIPTION
for Power-Over-LAN
t
DISC
= 2 x t
= 2 x (238ms + 16ms x 15)
= 956ms
DISC
nominal
33