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Personne àcontacter Mr. songhao
RM3022, Nan Guang Jie Jia Building, 3037 Shennan Road, Futian District, Shenzhen, Guangdong
The ADuM****1
is a USB-port isolator, based on Analog
Devices, Inc. iCoupler® technology. Combining high speed
CMOS and monolithic air core transformer technology, these
isolation components provide outstanding performance
characteristics and are easily integrated with low and full speed
USB compatible peripheral devices.
Many microcontrollers implement USB so that it presents only
the D+ and D- lines to external pins. This is desirable in many
cases because it minimizes external components and simplifies
the design; however, this presents particular challenges when
isolation is required. Since the USB lines must switch between
actively driving D+/D- and allowing external resistors to set the
state of the bus, the ADuM***0 provides mechanisms for
detecting the direction of data flow and control over state of the
output buffers. Data direction is determined on a packet by
packet basis.
The ADuM***0 uses the edge detection based iCoupler
technology in conjunction with internal logic to implement a
transparent, easily configured, up-stream facing port isolator.
Isolating the up-stream port provides several advantages in
simplicity, power management and robust operation.
The isolator has propagation delay comparable that of a
standard hub and cable. It operates with the supply voltage on
either side ranging from 3.0 V to 5.5 V, allowing connection
directly to VBUS by internally regulating the voltage to the
signaling level. The ADuM***0 provides isolated control of the
pull-up resistor to allow the peripheral to control connection
timing. The device draws low enough idle current that a
suspend state is not required.
