SI3452 SILABS [Silicon Laboratories], SI3452 Datasheet - Page 23

• Manufacturer Part Number: SI3452
• Description: QUAD HIGH-VOLTAGE PORT CONTROLLER FOR POE AND POE+ PSES
• Manufacturer: SILABS [Silicon Laboratories]

0 or 1 don’t care
0 or 1 don’t care
0 or 1 don’t care
0
1
*Note: During initial port turn-on (T
Power on port
Power off port
Reset port
Toggle detection
back-off timing
Reset chip
Get V
Read port current
Shut down
low-priority ports
Notes:
1. Port 1 has 2 bit port number 0x00; port 2 is 0x01, etc.
2. This command toggles bit 0 of Register 0x1D. When bit zero is set, the detection back-off of 2 seconds is implemented
Command
EE
(alternative B or “midspan” mode).
PoE+ bit
2
CMD Register
0x0C | port no
0x1C | port no
0x04 | port no
0x08 | port no
0x10
0x14
0x18
0x20
Class
0/3
START
1
2
4
4
Table 23. Si3452/3 Port Configuration
Table 24. Si3452/3 Command Codes
time of 60 ms), the current limit is set to 425 mA, even in PoE+ mode.
[B5..B2]
0001b
0010b
0011b
0100b
0101b
0110b
1000b
0111b
Auto Mode Setting of
I
CUT
Rev. 1.0
0xC9
0x1E
0x35
0x75
0x75
Register
[B1..B0] Command
2 bit port number
2 bit port number
2 bit port number
2 bit port number
Parameter
NA
NA
NA
NA
I
CUT
170 mA
375 mA
375 mA
640 mA
97 mA
1
Nominal
Port current in 100 µA
2 Byte Return Value
V
EE
Si3452/3
Ilim Nominal*
in mV units
units
—
—
—
—
—
—
425 mA
425 mA
425 mA
425 mA
850 mA
23