MAX5945CAX+T Maxim Integrated Products, MAX5945CAX+T Datasheet - Page 29

• 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 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
ther extend the programming range of these timers and
also increase the programming resolution.
When the MAX5945 shuts down a port due to an
extended overcurrent condition (either during startup or
normal operation), if RSRT_EN is set high, then the part
does not allow the port to power back on before the
restart timer (Table 19a) returns to zero. This effectively
sets a minimum duty cycle that protects the external
MOSFET from overheating during prolonged output
overcurrent conditions.
A reset sets R16h = 00h.
TSTART[1]
TSTART[0]
TFAULT[1]
TFAULT[0]
BCKOFF4
BCKOFF3
BCKOFF2
BCKOFF1
SYMBOL
SYMBOL
Reserved
Reserved
Reserved
Reserved
TDISC[1]
TDISC[0]
RSTR[1]
RSTR[0]
BIT [1:0]
ADDRESS = 16h
ADDRESS = 15h
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
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
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
Setting CL_DISC to 1 (Table 20) enables port-over-
class current protection, where the MAX5945 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.
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
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
FLT_LIM
1/2 x t
2 x t
4 x t
) according to the
t
FAULT
(60ms, typ)
FAULT
FAULT
FAULT
t
FAULT
nominal
nominal
nominal
nominal
29