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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： | 3/50页 |
| 文件大小： | 530K |
| 代理商： | DS2490 |
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DS2490
3 of 50
033199
USB TRANSCEIVER
OSCILLATOR
SUSPEND OUTPUT
ELECTRICAL CHARACTERISTICS
APPLICATION INFORMATION
APPENDIX 1
APPENDIX 2
Transceiver connection requirements
Oscillator connection requirements
SUSO
signal operation and purpose
DC and AC specifications
HW and SW application information
CONTROL COMMANDS – USB setup packet encoding
COMMUNICATION COMMANDS - USB setup packet
encoding
MODE COMMANDS - USB setup packet encoding
USB command and command type constant codes
APPENDIX 3
APPENDIX 4
OVERVIEW
The DS2490 directly interfaces a USB port to a 1-Wire bus. As shown in Figure 1, the DS2490
incorporates a USB physical interface, a USB device controller coupled with a 1-Wire specific USB
function core, and a 1-Wire bus interface controller. The 1-Wire interface controller shapes the slopes of
the 1-Wire wave-forms, applies programming pulses or strong pullup to 5V, and reads the 1-Wire bus
using a non-TTL threshold to maximize the noise margin for best performance on large 1-Wire
MicroLAN networks. 1-Wire waveform timing is accurately controlled with a crystal-based oscillator.
The DS2490 also supports USB remote wakeup which enables the DS2490 based USB peripheral to send
resume signaling to a suspended host system. If the remote wakeup function is enabled and the host
system is in a suspended state, a 1-Wire device attachment will cause the DS2490 to perform a host
system wakeup and allow the 1-Wire device to be serviced.
DS2490 FUNCTIONAL BLOCK DIAGRAM
Figure 1
USB
XCVR
USB
DEVICE
CONTROLLER
PWR
CNTL
USB
1-WIRE
FUNCTION
CORE
EP
FIFOS
OSC
CLK
GEN
USB
DESC
ROM
1-WIRE
I/F
CONTROLLER
1-WIRE
XI
VPP
XO
D+
D-
VB
VD
GND
SUSO
Typical application examples of the DS2490 are shown in Figure 2 (a-c). As shown in all the examples,
all host control and communication with the device is accomplished over a USB communication link. A
USB vendor-specific command set, as defined in this document, is used to select operational modes
(MODE commands), control command processing (CONTROL commands), and communicate over the
1-Wire interface (COMMUNICATION commands). Shown in Figure 2 example (a) is a DS2490 based
USB peripheral application. The peripheral function is a USB to 1-Wire adapter and provides both USB
and 1-Wire I/O connections. In this example the peripheral is attached to the USB enabled host computer
相关PDF资料 |
PDF描述 |
|---|---|
| DS2490S | USB to 1-Wire Bridge Chip |
| DS2502-E64 | IEEE EUI-64 Node Address Chip |
| DS26334 | 3.3V, 16-Channel, E1/T1/J1 Short and Long-Haul Line Interface Unit |
| DS26334G | 3.3V, 16-Channel, E1/T1/J1 Short and Long-Haul Line Interface Unit |
| DS26334GN | 3.3V, 16-Channel, E1/T1/J1 Short and Long-Haul Line Interface Unit |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2490S | 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 |
| 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) |
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