參數(shù)資料
型號(hào)： DS2490Y
廠(chǎng)商： Maxim Integrated Products
文件頁(yè)數(shù)： 16/50頁(yè)
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(xiàn)
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(lèi)型： 表面貼裝
DS2490
23 of 50
Command parameters:
2 bytes: match command byte, new 1-Wire speed byte (optional).
EP2 data:
Length
Description
8 bytes
ROM ID of the device to be accessed.
EP3 data:
None
Result Register:
If ICP = 1: no result data is generated.
If ICP = 0 and NTF = 1: a result value of 0x00 will be generated.
If IPC = 0 and NTF = 0: no result data is generated since there are no
error codes associated with this command.
READ STRAIGHT—This command transmits a user-specified preamble of data to the 1-Wire bus and
then reads back as many bytes as specified. The preamble typically consists of a 1-Wire command code
followed by TA1 and TA2. It is possible to include a Match ROM command and ROM ID in the
preamble to also address a device at the current speed. This command can also be used to copy the
scratchpad or disconnect a path. Embedded command bit RST enables a 1-Wire reset before the
command executes. The EP2 FIFO must be pre-filled with preamble data before command execution.
Additionally, for preamble sizes greater then the FIFO size, the FIFO content status must be monitored by
host SW so that additional data can be sent to the FIFO when necessary. A similar EP3 FIFO content
monitoring requirement exists for the block read. During a block read, the number of bytes loaded into
the EP3 FIFO must be monitored so that the data can be read before the FIFO overflows.
Command parameters:
3 bytes: 2-byte parameter specifying block read size, byte specifying
preamble size.
EP2 data:
Length
Description
Same as
preamble size
Preamble data to be written to the 1-Wire device.
EP3 data:
Length
Description
Same as block
size
Data block read from the 1-Wire device.
Result Register:
If ICP = 1: no result data is generated.
If ICP = 0 and NTF = 1: a result value of 0x00 will be generated.
If IPC = 0 and NTF = 0: no result data is generated since there are no
error codes associated with this command.
DO & RELEASE—This command is typically used to control the activity of the CPU of the crypto
iButton, which requires a release sequence. This command can also be used to read from or write to the
I/O buffer or Status Register of the crypto iButton. A short preamble (3 bytes) consists of a 1-Wire
command code followed by the release sequence. A four-byte preamble with embedded command bit R
= 1 consists of a 1-Wire command code followed by length byte and the release sequence. A 4-byte
preamble with embedded command bit R = 0 consists of a 1-Wire command code followed by a status
byte and the release sequence. The long preamble (minimum 5 bytes, embedded command bit R = 0)
consists of a 1-Wire command, a length byte, data bytes and the release sequence. In this case, the length
byte indicates the total number of bytes between the length byte and release sequence. The least
significant byte of the release sequence is transmitted first. Embedded command bit SPU must be 1 when
trying to run (start, continue) the CPU of the crypto iButton. In all other cases, SPU should be 0.
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 EP2 FIFO must be pre-filled with
preamble data before command execution. Additionally, for preamble sizes greater then the FIFO size,
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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(chēng):Maxim Integrated Products 功能描述:1-Wire 4Kb EEPROM
DS24B33 R 制造商:MAXIM 制造商全稱(chēng):Maxim Integrated Products 功能描述:1-Wire 4Kb EEPROM
DS24B33 T 制造商:MAXIM 制造商全稱(chēng):Maxim Integrated Products 功能描述:1-Wire 4Kb EEPROM
DS24B33 TR 制造商:MAXIM 制造商全稱(chēng):Maxim Integrated Products 功能描述:1-Wire 4Kb EEPROM
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