Product Summary

The DS9490B is an USB bridge and holder for a single F5-size iButton. The iButton is securely held behind a latched door. The DS9490B is a USB bridge with 1-Wire RJ11 interface to accommodate 1-Wire receptacles and networks. The DS9490B (Blue Dot™) can readily be used in conjunction with the DS9490B to create an iButton PC reader. Both adapters are based on the DS2490 USB to 1-Wire bridge chip. The applications of the DS9490B are (1)Software Authorization—Protection against software piracy by tying software operation to the presence of iButton hardware; (2)iButton Initialization and Download Loggers like the Thermochron? can be missioned and downloaded. Monetary iButtons can be refilled with money; (3)Demonstration—Demonstrate the features of iButtons or 1-Wire chips on personal computers; (4)Development—Aid development of 1-Wire applications by providing a PC interface to verify device contents and state.

Parametrics

DS9490B absolute maximum ratings: (1)I/O Voltage Range to GND: -0.3V to +6V; (2)I/O Sink Current: 20mA; (3)Operating Temperature Range: +15 to +140℃; (4)Junction Temperature: +150℃; (5)Storage Temperature Range: -25 to +140℃.

Features

DS9490B features: (1)High-Speed 12Mbps Universal Serial Bus (USB) Interface; (2)Supports Standard and Overdrive 1-Wire Communication; (3)Slew-Rate-Controlled 1-Wire Timing and Active Pullup for Improved 1-Wire Network Performance ; (4)DS9490R has an RJ11 Interface for Standard Connectivity Accessories such as the DS1402D-DR8; (5)DS9490B has an iButton Interface and Retains a Fixed iButton ; (6)Built-In Custom DS2401 Identification Chip; (7)Reads all 1-Wire and iButton Devices. Writes All Except EPROM 1-Wire/iButton Devices.

Diagrams

DS9490B block diagram

Image Part No Mfg Description Data Sheet Download Pricing
(USD)
Quantity
DS9490B
DS9490B

Maxim Integrated Products

Interface Modules

Data Sheet

Negotiable 
DS9490B#
DS9490B#

Maxim Integrated Products

Interface Modules USB:1-Wire/iButton Adapter

Data Sheet

0-1: $17.16
1-25: $14.30
25-50: $12.68
50-100: $10.30
DS9490B-E00
DS9490B-E00

Maxim Integrated Products

Interface Modules

Data Sheet

Negotiable 
DS9490B-MAC#
DS9490B-MAC#

Maxim Integrated Products

Interface Modules

Data Sheet

Negotiable 
DS9490B-MAC
DS9490B-MAC

Maxim Integrated Products

Interface Modules

Data Sheet

Negotiable