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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： | 26/50页 |
| 文件大小： | 530K |
| 代理商： | DS2490 |
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DS2490
26 of 50
033199
data can be sent to the FIFO when necessary. See the HW/SW APPLICATION RECOMMENDATION
section for additional details.
Command parameters:
2 bytes specifying block size.
EP2 data:
Length
3-bytes +
block size
EPROM device. 3-byte preamble: 1-Wire command
code, TA1, TA2 (typical).
EP3 data:
None
Result Register:
Code
Condition
CRC, CMP,
VPP
Preamble and data bytes to be sent to the 1-Wire
ICP=0 and an error condition.
READ CRC PROT PAGE -
This command is used to read one or multiple CRC-protected pages of
EPROM devices and to read tamper-detect bytes and counter value of Monetary iButtons. If embedded
command bit DT=1, the CRC16 generator is selected; if DT=0, CRC8 is used. Embedded command bit
CIB is used to specify either a 2- or 3-byte read preamble. 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. The command can also be used to read a single partial page up to the end of
that page and reading the PIOs of a DS2407. This command is also applicable to the Read IPR function
of the crypto iButton if CIB=1. The EP2 FIFO must be pre-filled with preamble 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 number of pages. 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.
EP2 data:
Length
If CIB=0: 3-bytes
3-byte preamble: 1-Wire command code, TA1, TA2
(typical).
If CIB=1: 2-bytes
2-byte preamble: 1-Wire command code, length
information.
EP3 data:
Length
Description
(page size x
number of
pages)
Result Register:
Code
Condition
CRC
ICP=0 and an error condition.
Data read from the 1-Wire device..
READ REDIRECT PAGE W/CRC -
This command is used to read a single page of data and check the
CRC. If the page is not redirected, the host will receive the page number and all its data. If the page is
redirected and embedded command bit CH=1 the device will follow the trail of redirections until a page is
found that is not redirected. When found, the host will receive the page number and all data of that
particular page. If CH = 0 and the first read attempt reveals a redirection the host will only receive the
number of the page the addressed page is redirected to. Reading starts at a page boundary. 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 is an indication of an infinite loop.
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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