DS9490R_11 MAXIM [Maxim Integrated Products], DS9490R_11 Datasheet - Page 2

• Manufacturer Part Number: DS9490R_11
• Description: USB to 1-Wire/iButton Adapters High-Speed 12Mbps Universal Serial Bus (USB) Interface
• Manufacturer: MAXIM [Maxim Integrated Products]

Figure 1. DS9490R
Figure 2. DS9490B
*Note: To eject an iButton, insert a straightened paper clip into the side access hole of the DS9490B. Push
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
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
12-BIT
FIXED
(000h)
LSB MSB
36-BIT SERIAL
NUMBER
2 of 6
LSB MSB
8-BIT FAMILY
CODE (81h)
LSB
LSB
DS9490R/DS9490B