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: 44/50页
文件大小: 530K
代理商: DS2490
DS2490
44 of 50
033199
COMMUNICATION COMMANDS
byte 1 – Preamble size. Number of bytes to be written.
DO & RELEASE
Setup Packet Encoding:
bmRequestType
0x40
COMM_CMD
bRequest
wValue
byte 2
byte 1
0
0
byte 1
byte 2:
byte 1:
0
1
1
0
1
0
SPU
1
F
R
ICP
1
0
IM
wIndex
byte 2
byte 2 – 0X00 (unused)
byte 1 – size in bytes of preamble to be written.
0x0000
wLength
SET PATH
Setup Packet Encoding:
bmRequestType
0x40
COMM_CMD
bRequest
wValue
byte 2
byte 1
0
0
byte 1
byte 2:
byte 1:
0
1
0
0
0
1
0
0
F
0
ICP
1
RST
IM
wIndex
byte 2
byte 2 – 0X00 (unused)
byte 1 – size in bytes of number of couplers that need to be activated
to set up the path to the target device.
0x0000
wLength
WRITE SRAM PAGE
DT=1 activates the CRC16 generator. This command is also
applicable to the Write IPR and Write I/O Buffer function of the
crypto iButton if CIB=1. To write a partial page the page size
parameter and the target address need to be set accordingly.
Setup Packet Encoding:
bmRequestType
0x40
COMM_CMD
bRequest
wValue
byte 2
byte 1
0
0
byte 1
byte 2:
byte 1:
0
1
PS
0
DT
1
0
1
F
0
ICP
1
0
IM
wIndex
byte 2
byte 2 – 0X00 (unused)
byte 1 – number of bytes to be sent to the device following a 3 byte
preamble. This number is typically identical to the page size. A value
of 0x00 stands for a 256 byte page.
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相关代理商/技术参数
参数描述
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