參數(shù)資料
型號： DS2490Y
廠商： Maxim Integrated Products
文件頁數(shù)： 19/50頁
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
26 of 50
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 DS2406. 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.
Command parameters:
2 bytes: 1 byte page size, 1 byte number of pages. Note that the Page
Size byte parameter value must be of the form log2(actual page size).
For example, if the actual page size is 3210, then the Page Size
parameter would need to be 0x05. Typical page sizes are 32 decimal for
data memory and 8 for status memory. 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)
Data read from the 1-Wire device.
Result Register:
Code
Condition
CRC
ICP = 0, NTF = 0 or 1: and an error condition.
0x00
ICP = 0, NTF = 1: no error detected
None
ICP = 0, NTF = 0: no error detected
None
ICP = 1
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.
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.
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相關(guān)代理商/技術(shù)參數(shù)
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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