参数资料
型号: DS2490S
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: 47/50页
文件大小: 530K
代理商: DS2490S
DS2490
47 of 50
033199
APPENDIX 3: DS2490 MODE COMMANDS, SETUP PACKET ENCODING
MODE COMMANDS
ENABLE PULSE
Setup Packet Encoding:
bmRequestType
0x40
MODE_CMD
MOD_PULSE_EN
bRequest
wValue
wIndex
byte 2
byte 1
byte 2 – 0x00
byte
1:
Strong pullup is enabled with SPUE=1, disabled with SPUE=0.
+12V Programming pulse is enabled with PRGE=1, disabled with
PRGE=0.
0x0000
0
0
0
0
0
0
SPU
E
PRGE
wLength
ENABLE SPEED CHANGE
Setup Packet Encoding:
bmRequestType
0x40
MODE_CMD
MOD_SPEED_CHANGE_EN
byte 2
byte 2 – 0x00
byte 1 – Boolean value. Speed changes are enabled with TRUE,
disabled with FALSE.
0x0000
bRequest
wValue
wIndex
byte 1
wLength
1-WIRE SPEED
Setup Packet Encoding:
bmRequestType
0x40
MODE_CMD
MOD_1WIRE_SPEED
bRequest
wValue
wIndex
byte 2
byte 1
byte 2 – 0x00
byte 1 – 1-Wire speed:
Code specifying communication speed of the 1-Wire bus. See
MODE CONTROL section for code definition.
0x0000
wLength
STRONG PULLUP
DURATION
Setup Packet Encoding:
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