DS2490 View Datasheet(PDF) - Dallas Semiconductor -> Maxim Integrated
Part Name
Description
Manufacturer
DS2490 Datasheet PDF : 50 Pages
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DS2490
SIGNAL SUMMARY Table 1
SIGNAL NAME TYPE FUNCTION
VD
PWR Power supply input for digital and 1-Wire functions. Range: 5.0±10%
VPP
PWR Power supply input for 1-Wire EPROM programming. Range:
12V±0.25V
VB
PWR Power supply input for USB functions. Range: 3.3V±10% supply
regulated from USB supplied VBUS.
D+
I/O USB data - non-inverted of differential data pair.
D-
I/O USB data - inverted signal of differential data pair.
1-Wire
I/O 1-Wire Input/Output.
PMOD
I Reserved for future use. Must be tied to GND.
SUSO
O Suspend Output - buffered USB suspend state output from USB device
controller. When LOW the USB is in an active non-suspended state,
when HIGH the USB has entered a suspended state. This is an open
drain output and requires an external pullup.
XI
I Crystal input. Use a 12.0 MHz, fundamental mode, parallel resonant
crystal. A 12.0 MHz CMOS clock source may also be used.
XO
O Crystal output. Connect to other side of crystal 1 if used.
GND
PWR Ground reference and ground return for 1-Wire bus.
NC
No connect. For factory use or reserved, do not connect to these pins.
RELATED DOCUMENTS
This specification uses terms from and references or complies with the Universal Serial Bus
Specification, which may be obtained from the USB Implementers Forum web site: www.usb.org. The
USB specification is considered to be part of the DS2490 specification.
This specification uses several terms and acronyms associated with Dallas Semiconductor 1-Wire
products and technologies. For a detailed description of iButton technology and terms download the
Book of iButton Standards from the Dallas Semiconductor iButton web site: www.ibutton.com.
DOCUMENT ORGANIZATION
The remainder of this document is organized into the following major sections:
SECTION
OVERVIEW
1-WIRE I/F CONTROLLER
USB COMMUNICATION
MODE COMMANDS
CONTROL COMMANDS
COMMUNICATION COMMANDS
DEVICE FEEDBACK
Summary
Device functional summary and application examples
Edge control and timing diagrams of 1-Wire signals
Configuration model, core and vendor-specific command
summaries
Commands used to configure 1-Wire interface operational
characteristics
Commands used to control 1-Wire communication
command processing
Commands used to communicate with an attached 1-Wire
device
Technique to obtain device status information
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