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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： | 12/50页 |
| 文件大小： | 530K |
| 代理商： | DS2490S |
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DS2490
12 of 50
033199
Notes:
1.
The only valid configuration values are 0 and 1 for the SET_CONFIGURATION request.
Configuration value 0 corresponds to the non-configured state.
2.
Only the DEVICE and CONFIGURATION descriptor types are supported for the
GET_DESCRIPTOR request.
3.
Interface 0 is the only valid interface value for the DS2490.
4.
The only valid feature selector for the command is DEVICE_REMOTE_WAKEUP.
5.
The DS2490 is intended, at a minimum, to be partially bus powered. Remote wakeup can be enabled
or disabled. GET_STATUS requests to the device will return a logic 0 for the self-powered bit field
and the current state value for the remote wakeup bit.
6.
There is no USB core level status information defined for interfaces. The DS2490 will always return
0 value data for GET_STATUS requests to interfaces.
DS2490 Vendor Specific USB Commands
Three different vendor-specific command types exist to control and communicate with the DS2490:
Control, Communication, and Mode. Control commands are used to manage various device functions
including the processing of communication commands, buffer clearing, and SW reset. Communication
commands are used for 1-Wire data and command I/O. Mode commands are used to establish the 1-Wire
operational characteristics of the DS2490 such as slew rate, low time, strong pullup, etc. Control,
Communication and Mode commands, like USB core requests, are communicated over the default control
pipe at EP0. With one exception as noted below, each command and any associated parameter data are
individually formatted into the 8-byte control transfer setup packet as follows:
bmRequestType
bRequest
wValue*
Request type bit map
(1 byte)
(1 byte)
(2 bytes)
wIndex
Command Parameters
(2 bytes)
wLength
0x0000
(not used)
Command Type
Command
*
The one exception to
wValue
formatting is for the READ STRAIGHT Communication command. This
command requires three parameter bytes which exceeds the 2-byte parameter encoding space available in
the
wIndex
field. For this command only, the
wValue
field will be formatted as 1 command byte and 1
parameter byte. See the command description in Appendix 2 for details.
The bit-mapped
bmRequestType
field identifies the characteristics of the USB command per Chapter 9
of the USB Specification. Fields included in this command describe the direction of the transfer, type of
request (core, class, or vendor specific) and the target of the command recipient (device, interface, or
endpoint). The only variation on the bmRequestType field for the different DS2490 vendor-specific
command will be for the transfer direction: host to device, or device to host; the recipient for all
commands will be the “device”.
The
bRequest
field contains a 1-byte constant identifying which of the three supported DS2490
command types is being sent. The command constants are defined in Appendix 4 and are summarized as
follows:
Command Type
CONTROL_CMD
COMM_CMD
MODE_CMD
Description
1-Wire interface control commands
1-Wire interface communication commands
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
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PDF描述 |
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| DS2502-E64 | IEEE EUI-64 Node Address Chip |
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| DS26334G | 3.3V, 16-Channel, E1/T1/J1 Short and Long-Haul Line Interface Unit |
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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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