DS2490Y Maxim Integrated Products, DS2490Y Datasheet - Page 40

• Manufacturer Part Number: DS2490Y
• Description: IC BRIDGE CLIP USB TO 1-W 24SOIC
• Manufacturer: Maxim Integrated Products

Specifications of DS2490Y

• Applications: USB
• Interface: 1-Wire
• Voltage - Supply: 3 V ~ 5.5 V
• Package / Case: 24-SOIC (7.5mm Width)
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

COMMUNICATION COMMANDS
SET DURATION
BIT NAME
Setup Packet Encoding:
RST
RTS
SPU
PST
SM
SE
R
Z
bmRequestType
discovered.
PST = 0 generate only one 1-Wire Reset sequence.
R = 0 performs a write function.
RST = 0 no 1-Wire Reset inserted.
devices than could be discovered in the current pass.
RTS = 0 does not return discrepancy information.
SE = 0 disable the speed change on the 1-Wire bus.
SM = 0 makes a “Strong Access” to a particular device.
command.
SPU = 0 no strong pullup.
the device.
Z = 0 checks if the byte to be written is identical to the one read back from the device.
DESCRIPTION
PST = 1 continuously generate 1-Wire Reset sequences until a presence pulse is
R = 1 performs a read function.
RST = 1 inserts a 1-Wire Reset before executing the command.
RTS = 1 returns the discrepancy information to the host if SM = 1 and there are more
SE = 1 enable the speed change on the 1-Wire bus.
SM = 1 searches for and reports ROM Ids without really accessing a particular device.
SPU = 1 inserts a strong pullup to 5V after a Bit or Byte or Block I/O or Do & Release
Z = 1 checks if the 0-bits in the byte to be written are 0-bits in the byte read back form
bRequest
wLength
wValue
wIndex
MODE CONTROL section for byte bit weighting and additional
format information.
0x40
COMM_CMD
byte 2:
byte 1:
byte 2 – 0x00 (unused)
byte 1 – new duration:
Unsigned 8-bit binary number specifying the new duration. See
0x0000
0
0
40 of 50
byte 2
byte 2
0
0
0
0
0
1
0
0
NTF
byte 1
byte 1
0
ICP
1
IM
0