SI3482-A01-GM Silicon Laboratories Inc, SI3482-A01-GM Datasheet - Page 12

• Manufacturer Part Number: SI3482-A01-GM
• Description: IC CTLR POE 24-48PORT PSE 24-QFN
• Manufacturer: Silicon Laboratories Inc

Specifications of SI3482-A01-GM

• Applications: Power Over Ethernet Controller
• Current - Supply: 12.1mA
• Voltage - Supply: 2.7 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-WFQFN Exposed Pad
• Product: Power Distribution
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Si3482
3.1.4. Data Length Field
The DataLength field specifies the number of bytes in the Data field. The number of bytes may be from zero to 255.
3.1.5. Data Field
The Data field is used to pass data to and from the Si3482. The Data field may contain four different types of data:




The Data field has a different format for each type of data. In almost all packets (sent and received), the Data field
has the Parameters format. The only exceptions are the packets that are received back after calling the
GetSystemInfo(), GetPortInfo(), and GetEvents() routines. The Data fields for these packets are in the System
Information format, Port Information format, and Events format.
3.1.5.1. Parameters Format
The Parameters format of the Data field is used to pass parameters to Power Manager routines. In most cases, the
Parameters format is also used to return data from the routines.
The Parameters format has an 8-bit Parm8 field followed by a 32-bit Parm32 field (see Table 7). Depending on the
routine being called, Parm8, Parm32, or both fields are used. Sometimes, neither field is used. However, both
fields are always sent and received. The DataLength field contains five.
12
*Note:
GetTotalPowerConsumed()
Parameters
System Information
Port Information
Events
GetPortPowerConsumed()
GetPortPowerRequested()
GetTotalPowerProvided()
GetTotalPowerGranted()
GetPortPowerGranted()
GetPortPriorityStatus()
GetSystemStatus()
The Parm32 field is big endian; therefore, the most significant byte is first.
GetSystemInfo()
GetPortStatus()
GetPortCount()
GetPortInfo()
Routine
Start Routine Data Length Data Checksum
Parameters in Sent Packet
Parm8
Figure 9. Parameters Format
Table 7. Use of Parameters
Port
Port
Port
Port
Port
Port
Rev. 0.1
Parm8
Parm32*
Parm32
PortPriorityStatus
SystemStatus
Parameters in Received Packet
Uses System Information Format
PortStatus
PortCount
Uses Port Information Format
Parm8
PowerConsumed
PowerConsumed
PowerRequested
PowerProvided
PowerGranted
PowerGranted
Parm32*