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SI3483 データシート(PDF) 10 Page - Silicon Laboratories

部品番号 SI3483
部品情報  POWER MANAGEMENT CONTROLLER
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メーカー  SILABS [Silicon Laboratories]
ホームページ  http://www.silabs.com
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SI3483 データシート(HTML) 10 Page - Silicon Laboratories

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Si3483
10
Confidential Rev. 1.1
3.1. Packet Format
A packet is a sequence of fields sent together as a unit. Figure 7 shows the SPP packet format.
Figure 7. Packet Format
Each field is a single byte except for the Data field. The Data field length may be from zero to 255 bytes.
3.1.1. Start Field
The Start field marks the beginning of a packet and always contains the Start-of-Packet (SOP) character (0xAC). If
data is lost on the host interface, the Serial Packet Server and the Serial Packet Client use the Start field to
resynchronize. A “receive packet” routine starts by receiving and discarding bytes until the SOP character is found.
3.1.2. Checksum Field
The Checksum field is used to verify that the packet was not corrupted during transmission. The sender of a packet
calculates the checksum and writes it into the Checksum field. The receiver of a packet verifies that the checksum
is correct. The Checksum field should contain the value such that all the bytes in the packet, except for the Start
field, add up to zero.
Figure 8. Packet Checksum
To calculate the checksum, the sender uses an 8-bit variable to sum up the bytes of the Routine field through the
end of the Data field. The sender adds one to the one's complement of this sum and stores the result in the
Checksum field.
To verify the checksum, the receiver uses an 8-bit variable to sum up the bytes of the Routine field through the
Checksum field. The sum should be zero.
3.1.3. Routine Field
The Routine field identifies a routine in the Power Manager API.
The client uses the Routine field to specify which routine to call. The client should verify that the Routine field in a
received packet matches the Routine field in the sent packet. Definitions of routines can be found in “4. Power
Manager API” .
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 Si3483. The Data field may contain four different types of data:
Parameters
System Information
Port Information
Events
The Data field has a different format for each type of data. The format of commands issued by the host to the
power manager is fixed, but the format of the returned values may be of four different types: Parameters, System
Information, Port Information, and Events.
To elaborate, in all packets issued by the host, the Data Field has the Parameters format. Most of the returned
packet are also in the Parameters format, the only exceptions being the packets that are received back after calling
Start Routine Data Length Data Checksum
Start Routine Data Length Data Checksum
Sum of Bytes is Zero
Checksum
~Sum
 1
+
=


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