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Post by mariotheissl on May 24, 2018 6:18:59 GMT
Hi, I would like to run the board at 3V3 instead 5V. For that I did the modification which are discussed in the following thread aurduino.boards.net/thread/121/rebuild-tc275-5v-3-3v. After the rebuild the voltage is at 3,3V and the LED on the board are on, when I measure the voltage at the pins I get instead of 5V 3,3V, so the modification of the voltage supply seems to work. But the board itself do not work the red led next to the reset pin is constantly on I do not get any connection to the board via usb with the arduino development environment, it throws the message that no board is connected The program which is flashed to the controller do not execute Do I have to change some settings to get the connection? I do need quick response, otherwise I have to build an adapter board to convert the 5V level to 3.3V level on the pins
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Post by Admin on May 24, 2018 7:12:56 GMT
Please look under the board and give us the part number. The is on the end of the board near the double row connector. It will be something like "4269.03.0621_A" or "4269.03.0621_B1".
Thanks
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Post by mariotheissl on May 24, 2018 7:46:35 GMT
Well, there is a number 4269.03.0626 but after that there is a white box and no extension like A or B
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Post by Admin on May 24, 2018 8:12:10 GMT
We have checked the thread on the 3V3 conversion and there is an extra step that is missing. The table in the second PDF explains what to do!
3v3Conversion.pdf (84.23 KB)
3v3Conversion2.pdf (382.37 KB)
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Post by mariotheissl on May 24, 2018 8:47:07 GMT
Thanks for quick support
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Post by soliver on May 24, 2018 12:20:43 GMT
I've changed the OR resistors from R320 and R323 to R319 and R324 as it is pictured in the schematics. But the problem endures. The red light next to the reset button is still contineously on. What should i check next?
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Post by soliver on May 24, 2018 13:18:44 GMT
The communication with the board now is ok, but there is still the problem with the red LED. It seems like there is a permanent reset Signal. Our assumption is, that there is something wrong with the reset button, because of the cnanged voltage supply.
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Post by mariotheissl on May 25, 2018 7:22:44 GMT
The PORST signal is permanently low at 0.15V, when the reset button is pressed, the PORST signal goes to 0.01V
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Post by mariotheissl on May 25, 2018 7:58:09 GMT
I have removed the u502 3-pin part next to the IOREF output pin. Now the board works without any failure. Can you give me any information what this u502 part is about, or if there are any constraint in the circuit without this part?
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Post by Admin on May 25, 2018 8:35:27 GMT
This is a simple reset controller.
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Post by mariotheissl on May 25, 2018 8:58:38 GMT
can you send the link of the datasheet?, just the information "simple reset controller' is not very helpful!
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Post by Admin on May 25, 2018 9:21:29 GMT
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wiken
New Member
Posts: 45 
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Post by wiken on Aug 28, 2018 8:57:50 GMT
Hi. To fix the reset. Is it so that the reset chip mcp102-xxx, maybe mcp102_475 should be changed to maybe mcp102_315 due to the voltages monitoring option? \Wiken  |
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Post by Admin on Aug 28, 2018 10:47:46 GMT
Yes! Populate U502 with MCP121T-315E/TT for 3V3 version.
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moss
New Member
Posts: 3
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Post by moss on Sept 3, 2018 13:00:25 GMT
Hi, The PCB I have is marked S/N: 4269.03.0626 but the picture over the board layout, for the hitex Shieldbuddy PCB
as I have found do not comply. Can you help me and present a picture over the board layout as will comply to the PCB with S/N: 4269.03.
\Moss
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