DS2490Y Maxim Integrated Products, DS2490Y Datasheet - Page 10

• 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

USB CONFIGURATION Figure 9
Endpoint (EP) Summary Description
EP0 is the endpoint for the bi-directional default control pipe. It is used for the USB enumeration process,
USB core request communication, and all DS2490 specific command communication.
EP1 is the endpoint for an interrupt pipe (device to host) and is used to relay DS2490 status register data
and specific command execution completion and/or error information to the host. It is also used to inform
the host of 1-Wire device-attach detection. The polling period requested for EP1 is either 10ms or 1ms,
depending on the alternate interface setting of the 1-Wire interface. The default polling period for EP1 is
10ms.
EP2 is an endpoint for a bulk data out pipe (data from host) and is used to transmit 1-Wire device data
from the host to the DS2490. The information received at this endpoint will be transmitted as data on the
1-Wire bus.
EP3 is an endpoint for a bulk data in pipe (data to host) and is used to send data received by the DS2490
from the 1-Wire bus back to the host for processing.
1-Wire Interface Summary Description
The interface is the USB collection point for the four endpoints. Four alternate settings exist for the 1-
Wire interface which correspond to different operational modes for the pipes to EP1, EP2, and EP3. As
shown in Table 2, the alternate settings specify different polling periods for the interrupt pipe and
different maximum packet sizes for the two bulk pipes.
USB HOST
SYSTEM
1-WIRE
CLIENT
SW
USB PHYSICAL I/F
interrupt pipe
default pipe
bulk pipe
bulk pipe
10 of 50
EP1
EP0
EP2
EP3
DS2490 USB 1-WIRE DEVICE
1-WIRE INTERFACE
USB ENUMERATION
USB CONTROL
1-WIRE MODE
1-WIRE CONTROL
1-WIRE COMMUNICATION
TOUCH DETECTION
DEVICE STATE
1-WIRE
DATA I/O