DS9490R Maxim Integrated Products, DS9490R Datasheet - Page 2

• Manufacturer Part Number: DS9490R
• Description: IC BRIDGE USB TO 1-WIRE RJ11
• Manufacturer: Maxim Integrated Products

Specifications of DS9490R

• Rohs Information: IButton RoHS Compliance Plan
• Accessory Type: USB to 1-Wire® RJ11 Adapter
• For Use With/related Products: 1-Wire® Devices
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Figure 1. DS9490R
Figure 2. DS9490B
*Note: To eject an iButton, insert a straightened paper clip into the side access hole of the DS9490B.
Each USB bridge contains a unique built-in identification chip. The identification chip is a custom
DS2401 that is a 64-bit ID number (see Figure 3).
Figure 3. DS2401 ID CHIP 64-BIT LASERED ROM
MSB
MSB
CRC CODE
Push the paper clip in the direction of the iButton. A different iButton can then be inserted. The
data contact faces down and away from the embossed ‘i’. Before inserting the paper clip
disconnect the DS9490B from the USB bus.
8-BIT
LSB
MSB
(000H)
12-BIT
FIXED
LSB MSB
36-BIT SERIAL
NUMBER
2 of 6
LSB MSB
8-BIT FAMILY
CODE (81H)
LSB
LSB
*
DS9490