参数资料
型号: DLP-USB245M-G
厂商: DLP Design Inc
文件页数: 8/15页
文件大小: 0K
描述: MODULE USB-TO-TTL PARL FIFO CONV
产品目录绘图: DLP-USBxxxM-G
标准包装: 1
系列: DLP-USB245M
类型: USB 至 FIFO
连接器类型: USB-B 至 DIL(双直插式)
产品目录页面: 635 (CN2011-ZH PDF)
其它名称: 813-1019
Device Configuration Examples
DLP-USB245M
USB 'B'
Connector
8
data
WR
RD#
DLP-USB245M User Manual
Microcontroller
TXE#
RXF#
Basic Connection to a Microcontroller
USB Bus Powered and Self Powered Configuration
Figure 1 illustrates a typical USB bus powered configuration. A USB Bus
Figure 1
1
3
10
11
12
24
13
Powered device gets its power from the USB bus. Basic rules for USB Bus
power devices are as follows –
a) On plug-in, the device must draw no more than 100mA
b) On USB Suspend the device must draw no more than 500uA.
c) A Bus Powered High Power Device ( one that draws more than 100mA )
should use the SLEEP# pin to keep the current below 100mA on plug-in and
Basic Bus-Powered
5V System
500uA on USB suspend.
d) A device that consumes more than 100mA can not be plugged into a USB
Bus Powered Hub
e) No device can draw more that 500mA from the USB Bus.
f) The power descriptor in the EEPROM should be programmed to a value of zero.
Figure 2 illustrates a typical USB self powered
configuration. A USB Self Powered device gets its power
from its own Power Supply and does not draw current
from the USB bus.
Figure 2
8
5.0V
Basic rules for USB Self power devices are as follows –
a) A Self-Powered device should not force current down
the USB bus when the USB Host or Hub Controller is
powered down.
b) A Self Powered Device can take as much current as it
likes during normal operation and USB suspend as it has
its own Power Supply.
5.0V
3
10
11
12
data
WR
RD#
TXE#
RXF#
Self-Powered
5V System
c) A Self Powered Device can be used with any USB Host and both Bus and Self Powered USB Hubs.
Copyright ? DLP Design 2002
Page 8 of 15
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