參數(shù)資料
型號(hào)： DS2490S
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： Bus Controller
英文描述： UNIVERSAL SERIAL BUS CONTROLLER, PDSO24
封裝： 0.300 INCH, SO-24
文件頁(yè)數(shù)： 35/51頁(yè)
文件大?。?/td> 444K
代理商： DS2490S
DS2490
40 of 50
APPENDIX 2: DS2490 COMMUNICATION COMMANDS, EMBEDDED COMMAND BITS, SETUP
PACKET ENCODING.
Communication commands contain embedded command parameter bits in the wValue field. The
definitions of bit parameters are described below.
BIT NAME
DESCRIPTION
CH
CH = 1 follows the chain if the page is redirected.
CH = 0 stops reading if the page is redirected.
CIB
CIB = 1 prevents a strong pullup to 5V if SPU = 1 and the bit read back from the 1-
Wire bus is 1.
CIB = 0 generally enables the strong pullup to 5V.
PS
PS = 1 reduces the preamble size to 2 bytes (rather than 3).
PS = 0 sets preamble size to 3 bytes.
D
Data bit value to be written to the 1-Wire bus.
DT
DT = 1 activates/selects the CRC16 generator
DT = 0 specifies no CRC.
F
F = 1 clears the buffers in case an error occurred during the execution of the previous
command; requires that ICP = 0 in the previous command.
F = 0 prevents the buffers from being cleared.
ICP
ICP = 1 indicates that the command is not the last one of a macro; as a consequence
command processing result feedback messages are suppressed.
ICP = 0 indicates that the command is the last one of a macro or single command
operation; enables command processing result feedback signaling.
IM
IM = 1 enables immediate execution of the command. Assumes that all 1-Wire device
data required by the command has been received at EP2.
IM = 0 prevents immediate execution of the command; execution must be started
through a control function command.
NTF
NTF = 1 always generate communication command processing result feedback if ICP =
0
NTF = 0 generate communication command processing result feedback only if an error
occurs and ICP = 0.
If ICP = 1 command result feedback is suppressed for either case, see the ICP bit above.
PST
PST = 1 continuously generate 1-Wire Reset sequences until a presence pulse is
discovered.
PST = 0 generate only one 1-Wire Reset sequence.
R
R = 1 performs a read function.
R = 0 performs a write function.
RST
RST = 1 inserts a 1-Wire Reset before executing the command.
RST = 0 no 1-Wire Reset inserted.
RTS
RTS = 1 returns the discrepancy information to the host if SM = 1 and there are more
devices than could be discovered in the current pass.
RTS = 0 does not return discrepancy information.
SE
SE = 1 enable the speed change on the 1-Wire bus.
SE = 0 disable the speed change on the 1-Wire bus.
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