參數(shù)資料
型號(hào)： DS2490Y
廠商： Maxim Integrated Products
文件頁(yè)數(shù)： 5/50頁(yè)
文件大?。?/td> 0K
描述： IC BRIDGE CLIP USB TO 1-W 24SOIC
標(biāo)準(zhǔn)包裝： 1,000
應(yīng)用： USB
接口： 1 線
電源電壓： 3 V ~ 5.5 V
封裝/外殼： 24-SOIC（0.295"，7.50mm 寬）
供應(yīng)商設(shè)備封裝： 24-SOIC W
包裝： 管件
安裝類型： 表面貼裝
DS2490
13 of 50
Command Type
Description
CONTROL_CMD
1-Wire interface control commands
COMM_CMD
1-Wire interface communication commands
MODE_CMD
1-Wire interface operational mode commands
The 2-byte wValue field is encoded with the specific command. For Control and Mode commands, the
field value corresponds to a specific command constant as defined in Appendix 4. For Communication
commands, the field has additional embedded command parameters as indicated in Appendix 2. The
exception is the READ STRAIGHT command as described previously.
The 2-byte wIndex is used to hold additional command parameter data when required by the specific
command.
The wLength field is used in the control transfer setup packet to specify the number of bytes to be sent
during the data stage of a control transfer. The “GET COMM CMDS” control command is the only
DS2490 command that uses the data stage of the control transfer. Typically, all command data is
embedded in the setup stage. Except for the GET COMM CMDS, this field must be set to 0x0000.
DS2490 Control, Communication, and Mode vendor-specific command descriptions and formatting are
defined in Appendices 1, 2, and 3. Vendor-specific commands not defined in the appendices are not
supported by the DS2490 and the device will respond with a STALL if an unsupported command is
received.
MODE COMMANDS
DS2490 1-Wire characteristics and features (speed, durations, slew rate, etc.) are controlled with discrete
Mode commands and/or embedded Communication command parameters. Parameter values and
enable/disable settings are used for characteristic control. Mode settings are stored in the DS2490 State
Registers and can be read at any time or at the polling interval of EP1. See the section “DEVICE
FEEDBACK” for State Register details.
Enable/disable settings are used to control two global features:
Strong pullup to +5V
Dynamic 1-Wire bus communication speed change through a communication command
The settings for these three global controls are accessible only through Mode commands; the features are
either enabled or disabled with the appropriate Mode command. Specific Communication commands
exist to issue a strong pullup, or speed change. When the corresponding setting is enabled the feature is
usable as part of a communication command when disabled the feature is not usable.
Parameter values and codes are used to specify and control 1-Wire bus characteristics:
1-Wire bus communication speed
+5V strong pullup duration
Pulldown slew rate
Write-1 low time
Data sample offset/Write-0 Recovery time
These five settings are controllable with discrete Mode commands or as embedded command/parameter
values in Communications commands.
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參數(shù)描述
DS2490Y+ 制造商:Maxim Integrated Products 功能描述:USB TO 1-WIRE BRIDGE 24SOIC W - Tape and Reel
DS24B33 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:1-Wire 4Kb EEPROM
DS24B33 R 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:1-Wire 4Kb EEPROM
DS24B33 T 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:1-Wire 4Kb EEPROM
DS24B33 TR 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:1-Wire 4Kb EEPROM
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