DS2490 查看數據表（PDF） - Maxim Integrated

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DS2490

USB to 1-Wire Bridge Chip

Maxim Integrated 

DS2490

SIGNAL SUMMARY Table 1

SIGNAL NAME TYPE FUNCTION

VD

PWR Power supply input for digital and 1-Wire functions. Range: 5.0  10%

VD2

PWR Second VD supply, must be tied to VD externally to the IC (the two pins

are not tied together inside the package).

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 HIGH the USB is in an active non-suspended state,

when LOW 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 12.0MHz 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

v1.1, which may be obtained from the USB Implementers Forum website: www.usb.org. The USB

specification is considered to be part of the DS2490 specification.

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

USB TRANSCEIVER

OSCILLATOR

SUSPEND OUTPUT

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

Transceiver connection requirements

Oscillator connection requirements

SUSO signal operation and purpose

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