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AVR459
14.5.4 Read the SB200 PCB Temperature.
The NTC placed close to the Constant Current Load can be read. Response is a
temperature between -40°C to 125°C.
Read_Temperature ()
SYNC
U
0x55
ADDRESS
M
0x4D
SENDER
P
0x50
COMMAND
t
0x74
NBYTES
0
0x00
CS
Calc
0x66
CR
?
0x0D
Response: Send_Temperature ()
SYNC
U
0x55
ADDRESS
P
0x50
SENDER
M
0x4D
COMMAND
t
0x74
NBYTES
2
0x02
DATA
int Temp
0x0019
CS
Calc
0x81
CR
?
0x0D
14.6 Communication protocol between the USB1287 gateway and SB201/SB204.
The communication between the SB200 and SB201/ SB204 is based on a half duplex
UART – here referred to as Asynchronous smart battery bus (ASBBus).
The SBS specification uses the SMbus protocol, but since SB201 uses software
UART, some changes have been made to improve reliability. Addressing has also
been removed.
SB201 supports the four different types of messages used by SBS:
?
?
?
?
Read word
Write word
Read block
Write block
A word command always has two bytes of data and a block command always 32
bytes, which is different from the SBS block commands that has variable length.
The host sends a command where the MSB determines if it’s a write or read. 0
means write and 1 means read. This allows for 128 different commands that both
support read and write. From the command itself it is not possible to determine if it is
a word or block command; both sides have to agree what all commands are.
SB201 immediately sends back the command; this allows the host to detect if SB201
received the command correctly. What happens after that depends on the type of
message used by that command.
A Packet Error-checking Code (PEC) is appended to all data to be able to detect
errors. The PEC is a CRC8 with polynomial 0x8D (CRC8-CCITT) calculated from the
command and all data bytes.
14.6.1 Read commands
On read commands, SB201 starts to send data after it has sent back the command.
The PEC is also appended. However, if the command wasn’t supported, nothing is
sent back (except for the command byte).
13
8132A-AVR-10/08
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