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SARK100
User Manual
Problem
The display shows no message
Solution
If the PC does not detect the device it may be an assembly error of
the USB chip (U8). Check the solders because it is a fine pitch
component and could have been a bad soldier terminal or shorted.
First check that all board supplies are correct including the display
supply.
One possible cause is that the PSoC microcontroller is not
programmed correctly or lost the programming, for example, after
an interrupted software update. In this case you should try the
software update, see Appendix F:.
If this is not possible it would be needed reprogramming the PSoC
using the provided ISP connection in the board. You will need a
PSoC programmer for that purpose. If you don’t have it you can
ask me for a preprogrammed PSoC.
13.2 Voltage Charts
Open circuit
50 Ω Load
Short-circuit
Rev 0.5 December 14, 2010
VA
U4 Pin 1
0
0,7
1,2
VZ
U4 Pin 2
1,8
0,7
0
- 51 -
VR
U4 Pin 3
0,8
0
0,6
VF
U4 Pin 4
1,8
1,4
1,2
Copyright EA4FRB – Melchor Varela 2010