User's Manual

July 23, 2002 4-1
CreataLink2 XT Hardware Integrator’s Guide Hardware Integration
Power Supply
Power Supply
SmartSynch, Inc. recommends a 2A power supply in the lab. This ensures sufficient
power to transmit. However, if the two driven output ports (pins 21 and 22 of the
22-pin connector) are utilized at their maximum rating of 350 mA sink/source
current and the six open collector I/Os are utilized at their maximum rating of 25
mA sink current, it will result in up to 850 mA of additional current consumed. A
power supply of 3A would be required. A detailed overview of the interface board is
shown in
Figure 4-1.
Line-Powered Implementation
Line-powered configurations typically imply fixed-mount applications. A key design
consideration is the need to filter 60-Hz noise from the ac supply line, which has a
negative impact on data transceiver performance.
The following design considerations are important when you install a fixed-mount
application:
• The dc power noise levels on the host interface to the 22-pin connector
➧
A rise time of 500 us is required on the 2A power supply when you power up the
transmitter. The supply voltage can sag to 5V at this time, without impact to
transmitter operation.
990006
Figure 4-1. Interface Board for Off-Board Host Configuration or Sof t wa r e De ve l op m en t of Th i r d Pa rt y
Embedded Application
Creatalink2 XT
Interface Board
22-pin Header
22-pin Header
JTAG
SMA
(Optional)
Ribbon Cable
Serial
Protocol
Analyzer
3-Amp
Power Supply
PC or device
under test
Backup Batt. or
Transmit Supply
Backup
Power
Main
Power
ICE or
JEENI
Box
ICE Box
Connect
JTAG Cable
JTAG Probe Blk Terminal Blk
(Required for ICE Box
but not for JEENI Box)
DB-9
Embedded
(This setup
enclosed in
the dotted box
is only used
for on-board
application
development)
990137-O
4Hardware Integration