DS2490Y Maxim Integrated Products, DS2490Y Datasheet - Page 43

• 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
MATCH ACCESS
READ STRAIGHT
Setup Packet Encoding:
Setup Packet Encoding:
bmRequestType
bmRequestType
bRequest
bRequest
wLength
wLength
wValue
wValue
wIndex
wIndex
0x40
COMM_CMD
byte 2:
byte 1:
byte 2 – new speed:
0x02 with SE = 1 after Overdrive Skip ROM
0x01 or 0x00 with SE = 1 in all other cases
don’t care with SE = 0
byte 1 – 1-Wire command:
Command to be used for addressing a 1-Wire device. Valid codes:
0x55 (Match ROM)
0x69 (Overdrive Match ROM)
0x0000
0x40
COMM_CMD
byte 2:
byte 1:
byte 2 – Block size HI. Number of bytes to be read, most significant
byte.
byte 1 - Block size LOW. Number of bytes to be read, least
significant byte.
byte 2 – 0x00 (not used)
byte 1 – Preamble size. Number of bytes to be written.
Preamble size. Number of bytes to be written.
0
0
1
43 of 50
byte 2
byte 2
byte 2
byte 2
byte 2
0
1
0
0
1
0
0
0
0
NTF
SE
0
NTF
ICP
byte 1
byte 1
byte 1
byte 1
byte 1
1
RST
ICP
0
RST
IM
IM