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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： | 40/50页 |
| 文件大小： | 530K |
| 代理商： | DS2490S |
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DS2490
40 of 50
033199
APPENDIX 2: DS2490 COMMUNICATION COMMANDS, EMBEDDED COMMAND BITS, SETUP
PACKET ENCODING.
Communication commands contain embedded command parameter bits in the wValue field. The
definitions of bit parameters are described below.
BIT NAME
DESCRIPTION
CH
CH=1 follows the chain if the page is redirected.
CH=0 stops reading if the page is redirected.
CIB
CIB=1 prevents a strong pullup to 5V if SPU=1 and the bit read back from the 1-Wire
bus is 1.
CIB=0 generally enables the strong pullup to 5V.
PS
PS=1 reduces the preamble size to 2 bytes (rather than 3).
PS=0 sets preamble size to 3 bytes.
D
Data bit value to be written to the 1-Wire bus.
DT
DT=1 activates/selects the CRC16 generator
DT=0 specifies no CRC.
F
F=1 clears the buffers in case an error occurred during the execution of the previous
command; requires that ICP=0 in the previous command.
F=0 prevents the buffers from being cleared.
ICP
ICP=1 indicates that the command is not the last one of a macro; as a consequence error
feedback messages are suppressed.
ICP=0 indicates that the command is the last one of a macro or single command
operation; enables error feedback signaling.
IM
IM=1 enables immediate execution of the command. Assumes that all 1-Wire device
data required by the command has been received at EP2.
IM=0 prevents immediate execution of the command; execution must be started through
a control function command.
PST
PST=1 continuously generate 1-Wire Reset sequences until a presence pulse is
discovered.
PST=0 generate only one 1-Wire Reset sequence.
R
R=1 performs a read function.
R=0 performs a write function.
RST
RST=1 inserts a 1-Wire Reset before executing the command.
RST=0 no 1-Wire Reset inserted.
RTS
RTS=1 returns the discrepancy information to the host if SM=1 and there are more
devices than could be discovered in the current pass.
RTS=0 does not return discrepancy information.
SE
SE=1 enable the speed change on the 1-Wire bus.
SE=0 disable the speed change on the 1-Wire bus.
SM
SM=1 searches for and reports ROM Ids without really accessing a particular device.
SM=0 makes a “Strong Access” to a particular device.
SPU
SPU=1 inserts a strong pullup to 5V after a Bit or Byte or Block I/O or Do & Release
command.
SPU=0 no strong pullup.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2490S+ | 制造商:Maxim Integrated Products 功能描述:USB TO 1-WIRE BRIDGE 24SOIC W - Rail/Tube 制造商:Maxim Integrated Products 功能描述:USB 1-W BRIDGE CHIP 24-SO LF 制造商:Maxim Integrated Products 功能描述:Bulk |
| DS2490S+T&R | 制造商:Maxim Integrated Products 功能描述:USB TO 1-WIRE BRIDGE 24SOIC W - Tape and Reel |
| DS2490S+TR | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:USB to 1-Wire Bridge Chip |
| DS2490X | 制造商:未知厂家 制造商全称:未知厂家 功能描述:USB to 1-Wire Bridge Chip(468.41 k) |
| DS2490X/T&R | 功能描述:接口 - 专用 RoHS:否 制造商:Texas Instruments 产品类型:1080p60 Image Sensor Receiver 工作电源电压:1.8 V 电源电流:89 mA 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:BGA-59 |
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