DLP-USB245M-G DLP Design Inc, DLP-USB245M-G Datasheet - Page 8

• Manufacturer Part Number: DLP-USB245M-G
• Description: MODULE USB-TO-TTL PARL FIFO CONV
• Manufacturer: DLP Design Inc
• Series: DLP-USB245Mr

Specifications of DLP-USB245M-G

• Convert From (adapter End): USB
• Convert To (adapter End): DB9 Female
• Features: Integrated 6MHz-48MHz clock multiplier PLL
• Interface Type: USB
• Product: Interface Modules
• For Use With/related Products: Windows® 98 or higher, Mac OS 8.5 or higher
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 813-1019

Device Configuration Examples
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.
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.
c) A Self Powered Device can be used with any USB Host and both Bus and Self Powered USB Hubs.
Figure 1
Basic Bus-Powered
Connector
Copyright © DLP Design 2002
USB 'B'
5V System
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12
1
3
DLP-USB245M
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USB Bus Powered and Self Powered Configuration
Basic Connection to a Microcontroller
Figure 1 illustrates a typical USB bus powered configuration. A USB Bus
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
500uA on USB suspend.
d) A device that consumes more than 100mA can not be plugged into a USB
Bus Powered Hub
TXE#
RXF#
RD#
WR
data
8
5.0V
Figure 2
Microcontroller
DLP-USB245M User Manual
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Self-Powered
5V System
data
TXE#
RXF#
RD#
WR
8
5.0V