MAX5935CAX Maxim Integrated Products, MAX5935CAX Datasheet - Page 29

• Manufacturer Part Number: MAX5935CAX
• Description: Hot Swap & Power Distribution
• Manufacturer: Maxim Integrated Products

Specifications of MAX5935CAX

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Table 18. Backoff Enable Register
Table 19. Timing Register
Table 19a. Startup, Fault, and Load Disconnect Timers with Default Values in the
Register 27h and 28h
sets a minimum duty cycle that protects the external
MOSFET from overheating during prolonged output
overcurrent conditions.
A reset sets R16h = 00h.
Setting CL_DISC to 1 (Table 20) enables port-over-
class current protection, where the MAX5935 scales
down the overcurrent limit (V
port classification status. This feature provides protec-
tion to the system against PDs that violate their maxi-
mum class current allowance.
A reset sets R17h = 0xC0.
Reserved
Reserved
Reserved
Reserved
BCKOFF4
BCKOFF3
BCKOFF2
BCKOFF1
TSTART[1]
TSTART[0]
TFAULT[1]
TFAULT[0]
SYMBOL
SYMBOL
TDISC[1]
TDISC[0]
RSTR[1]
RSTR[0]
Bit[1:0]
ADDRESS = 15h
ADDRESS = 16h
00
01
10
11
BIT
BIT
______________________________________________________________________________________
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R
R
R
R
FLT_LIM
16 x t
32 x t
64 x t
0 x t
RSTR
Reserved
Reserved
Reserved
Reserved
Enable Cadence timing on Port 4
Enable Cadence timing on Port 3
Enable Cadence timing on Port 2
Enable Cadence timing on Port 1
Restart timer programming bit 1
Restart timer programming bit 0
Startup timer programming bit 1
Startup timer programming bit 0
Overcurrent timer programming bit 1
Overcurrent timer programming bit 0
Load disconnect timer programming bit 1
Load disconnect timer programming bit 0
FAULT
FAULT
FAULT
FAULT
) according to the
Quad Network Power Controller
1/4 x t
1/2 x t
2 x t
t
(350ms, typ)
DISC
DISC
DISC
DISC
t
DISC
nominal
nominal
nominal
nominal
Power-enable “pushbutton” (Table 21) for SEMI and
MANUAL modes. Setting PWR_ON_ to 1 turns on
power to the corresponding port. Setting PWR_OFF_ to
1 turns off power to the port. PWR_ON is ignored when
the port is already powered and during shutdown.
PWR_OFF is ignored when the port is already off and
during shutdown. After execution, the bits reset to 0.
During detection or classification if PWR_ON_ goes
high, the MAX5935 gracefully terminates the current
operation and turn-on power to the port. The MAX5935
ignores the PWR_ON_ in AUTO mode. A reset sets
R19h = 00h.
DESCRIPTION
DESCRIPTION
for Power-Over-LAN
1/2 x t
2 x t
4 x t
t
START
(60ms, typ)
START
START
START
t
START
nominal
nominal
nominal
nominal
1/2 x t
2 x t
4 x t
t
FAULT
(60ms, typ)
FAULT
FAULT
FAULT
t
FAULT
nominal
nominal
nominal
nominal
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