參數(shù)資料
型號(hào)： DS2490Y
廠商： Maxim Integrated Products
文件頁(yè)數(shù)： 23/50頁(yè)
文件大?。?/td> 0K
描述： IC BRIDGE CLIP USB TO 1-W 24SOIC
標(biāo)準(zhǔn)包裝： 1,000
應(yīng)用： USB
接口： 1 線
電源電壓： 3 V ~ 5.5 V
封裝/外殼： 24-SOIC（0.295"，7.50mm 寬）
供應(yīng)商設(shè)備封裝： 24-SOIC W
包裝： 管件
安裝類型： 表面貼裝
DS2490
3 of 50
SECTION
SUMMARY
ELECTRICAL CHARACTERISTICS
DC and AC specifications
APPLICATION INFORMATION
HW application example
APPENDIX 1
CONTROL COMMANDS—USB setup packet encoding
APPENDIX 2
COMMUNICATION COMMANDS—USB setup packet
encoding
APPENDIX 3
MODE COMMANDS—USB setup packet encoding
APPENDIX 4
USB command and command type constant codes
OVERVIEW
The DS2490 directly interfaces a USB port to a 1-Wire bus. As shown in Figure 1, the DS2490
incorporates a USB physical interface, a USB device controller coupled with a 1-Wire-specific USB
function core, and a 1-Wire bus interface controller. The 1-Wire interface controller shapes the slopes of
the 1-Wire waveforms, applies strong pullup to 5V, and reads the 1-Wire bus using a non-TTL threshold
to maximize the noise margin for best performance on large 1-Wire Networks. 1-Wire waveform timing
is accurately controlled with a crystal-based oscillator.
The DS2490 also supports USB remote wake-up which enables the DS2490-based USB peripheral to
send resume signaling to a suspended host system. If the remote wake-up function is enabled and the host
system is in a suspended state, a 1-Wire device attachment will cause the DS2490 to perform a host
system wake-up and allow the 1-Wire device to be serviced.
DS2490 FUNCTIONAL BLOCK DIAGRAM Figure 1
USB
XCVR
USB
DEVICE
CONTROLLER
PWR
CNTL
USB
1-WIRE
FUNCTION
CORE
EP
FIFOS
OSC
CLK
GEN
USB
DESC
ROM
1-WIRE
I/F
CONTROLLER
SUSO
1-WIRE
XI XO
D+
D-
VB
VD
GND
VPP
VD2
Typical application examples of the DS2490 are shown in Figure 2 (a to c). As shown in all the examples,
all host control and communication with the device is accomplished over a USB communication link. A
USB vendor-specific command set, as defined in this document, is used to select operational modes
(MODE COMMANDS), control command processing (CONTROL COMMANDS), and communicate
over the 1-Wire interface (COMMUNICATION COMMANDS). Shown in Figure 2, example (a) is a
DS2490-based USB peripheral application. The peripheral function is a USB to 1-Wire adapter and
provides both USB and 1-Wire I/O connections. In this example, the peripheral is attached to the USB
enabled host computer either directly at a root port or through a USB hub. The 1-Wire bus interface
provided by the DS2490 supports all 1-Wire devices manufactured by Dallas Semiconductor as well as
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參數(shù)描述
DS2490Y+ 制造商:Maxim Integrated Products 功能描述:USB TO 1-WIRE BRIDGE 24SOIC W - Tape and Reel
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DS24B33 R 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:1-Wire 4Kb EEPROM
DS24B33 T 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:1-Wire 4Kb EEPROM
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