参数资料
型号: DS2490
英文描述: USB to 1-Wire Bridge Chip
中文描述: USB与1-Wire桥接芯片
文件页数: 43/50页
文件大小: 530K
代理商: DS2490
DS2490
43 of 50
033199
COMMUNICATION COMMANDS
bmRequestType
bRequest
wValue
0x40
COMM_CMD
byte 2
byte 1
0
1
byte 1
byte 2:
byte 1:
0
0
0
1
0
1
SPU
1
0
0
ICP
0
RST
IM
wIndex
byte 2
byte 2 – block size (HI), most significant byte
byte 1 – block size (LOW), least significant byte
0x0000
wLength
MATCH ACCESS
Setup Packet Encoding:
bmRequestType
0x40
COMM_CMD
bRequest
wValue
byte 2
byte 1
0
1
byte 1
byte 2:
byte 1:
0
0
0
1
0
1
0
0
0
ICP
0
RST
IM
SE
wIndex
byte 2
byte 2 – new speed:
0x02
0x01 or 0x00 with SE=1 in all other cases
don’t care
byte 1 – 1-Wire command:
Command to be used for addressing a 1-Wire device. Valid codes:
0x55 (Match ROM)
0x69 (Overdrive Match ROM)
0x0000
with SE=1 after Overdrive Skip ROM
with SE=0
wLength
READ STRAIGHT
Setup Packet Encoding:
bmRequestType
0x40
COMM_CMD
bRequest
wValue
byte 2
byte 1
byte 2:
byte 1:
Preamble size. Number of bytes to be written.
1
0
0
byte 2
byte 2 – Block size HI. Number of bytes to be read, most significant
byte.
byte 1 - Block size LOW. Number of bytes to be read, least
significant byte.
byte 2
byte 2 – 0x00 (not used)
0
0
ICP
byte 1
RST
IM
wIndex
wLength
byte 1
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