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參數(shù)資料
| 型號： | DS2720CU/T&R |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | MICRO, SOP-8 |
| 文件頁數(shù)： | 6/21頁 |
| 文件大?。?/td> | 264K |
| 代理商： | DS2720CU/T&R |
DS2720
14 of 21
Skip Net Address [CCh].
This command saves time when there is only one 1-Wire device on the bus by
allowing the bus master to issue a function command without specifying the address of the slave. If more
than one slave device is present on the bus, a subsequent function command can cause a data collision
when all slaves transmit data at the same time.
Search Net Address [F0h].
This command allows the bus master to use a process of elimination to
identify the 1-Wire net addresses of all slave devices on the bus. The search process involves the
repetition of a simple three-step routine: read a bit, read the complement of the bit, then write the desired
value of that bit. The bus master performs this simple three-step routine on each bit location of the net
address. After one complete pass through all 64 bits, the bus master knows the address of one device. The
remaining devices can then be identified on additional iterations of the process. See Chapter 5 of the Book
of DS19xx iButton Standards
for a comprehensive discussion of a net address search, including an actual
example.
Resume Command [A5H].
In a typical application the DS2720 can be accessed several times to
complete control adjustment. To maximize data throughput in a multidrop environment, the resume
command has been implemented. This function checks the status of an internal flag. If it is set, it directly
transfers control in similar fashion to the skip net address command. The only way to set the internal flag
is through successfully executing the match net address or search net address. Once the flag has been set,
the device can be repeatedly accessed through the resume command. Accessing another device on the bus
clears the flag, thus preventing two or more devices from simultaneously responding to the resume
command function.
FUNCTION COMMANDS
After successfully completing one of the net address commands, the bus master can access the features of
the DS2720 with any of the function commands described in the following paragraphs. The name of each
function is followed by the 8-bit opcode for that command in square brackets. The function commands
are summarized in Table 5.
Read Data [69h, XX].
This command reads data from the DS2720 starting at memory address XX. The
LSb of the data in address XX is available to be read immediately after the MSb of the address has been
entered. Because the address is automatically incremented after the MSb of each byte is received, the LSb
of the data at address XX + 1 is available to be read immediately after the MSb of the data at address XX.
If the bus master continues to read beyond address FFh, data is read starting at memory address 00 and
the address is automatically incremented until a reset pulse occurs. Addresses labeled “Reserved” in the
memory map contain undefined data. The read data command can be terminated by the bus master with a
reset pulse at any bit boundary.
Write Data [6Ch, XX].
This command writes data to the DS2720 starting at memory address XX. The
LSb of the data to be stored at address XX can be written immediately after the MSb of address has been
entered. Because the address is automatically incremented after the MSb of each byte is written, the LSb
to be stored at address XX + 1 can be written immediately after the MSb to be stored at address XX. If
the bus master continues to write beyond address FFh, the data starting at address 00 is overwritten.
Writes to read-only addresses, reserved addresses and locked EEPROM blocks are ignored. Incomplete
bytes are not written. Writes to unlocked EEPROM blocks are to shadow RAM rather than EEPROM.
See the Memory section for more details.
Copy Data [48h, XX].
This command copies the contents of shadow RAM to EEPROM for the 4-byte
EEPROM block containing address XX. Copy data commands that address locked blocks are ignored.
While the copy data command is executing, the EEC bit in the EEPROM register is set to 1 and writes to
iButton is a registered trademark of Dallas Semiconductor.
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