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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： | 27/50页 |
| 文件大小： | 530K |
| 代理商： | DS2490 |
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DS2490
27 of 50
033199
The EP2 FIFO must be pre-filled with ROM ID and command code data before command execution. To
prevent overflow, the EP3 FIFO must be monitored (and read if necessary) during command execution if
reading more data than the size of the EP3 FIFO. See the HW/SW APPLICATION
RECOMMENDATION section for additional details.
Command parameters:
2 bytes: 1 byte page size, 1 byte page address. Page size byte indicates
the number of bytes that are considered a page; typical is 32 decimal for
data memory, 8 for status memory, and 40 decimal for Monetary
iButtons. A page size of 0x00 indicates a 256-byte page. The page
address specifies the page number to be used for the first read attempt.
EP2 data:
Length
9 bytes
8 bytes ROM ID of the 1-Wire device to be accessed
followed by the 1-Wire command code for “Extended
Read Memory”.
EP3 data:
Length
Description
If CH=1 or page is not
redirected:
size
If CH=0 and page is
redirected:
to.
Result Register:
Code
Condition
RDP, CRC,
NRS
1 byte + page
Page number and contents of the page.
1 byte
Number of the page the addressed page is redirected
ICP=0 and an error condition.
SEARCH ACCESS -
The SEARCH ACCESS command is used to either access a device using the
Search ROM command or to identify the devices on the active segments of a MicroLAN. Embedded
command bit SM is used to specify the type of search. Embedded command bit RTS is used to control
discrepancy information reporting. Additionally, embedded command bit F can be used to clear the
Communication command buffer and EP2, 3 FIFOs if an error occurs during execution of the command.
An NRS error code indicates that there was no response on at least one of the 64 bits of the ROM search.
The EP2 FIFO must be pre-filled with ROM ID data before command execution. To prevent overflow,
the EP3 FIFO must be monitored (and read if necessary) during command execution if returning more
data than the size of the EP3 FIFO. See the HW/SW APPLICATION RECOMMENDATION section for
additional details.
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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