GARYHUNG Posted March 8, 2018 Share Posted March 8, 2018 We have purchased JTAG-SMT2 products, and used in our programming products Why JTAG-SMT2 does not directly use the 5V power supply USB connector to generate 3.3V POWER? If so, this board design and use will be more simple (Because of the need to provide an extra 3.3V power supply) Link to comment Share on other sites More sharing options...
jpeyron Posted March 8, 2018 Share Posted March 8, 2018 Hi @GARYHUNG, This choice was carried over from the SMT1. The USB controller on the SMT1 required an extra regulator to generate the 3.3V rail from USB power, and therefore we chose to have the host PCB power the SMT1. The SMT3 has the same USB controller IC that the SMT1 does. So again, having it powered from VBUS would only be possible if we included an extra 3.3V regulator. We don’t have space for that on the module so we stuck with taking 3.3V from the system board. thank you, Jon Link to comment Share on other sites More sharing options...
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GARYHUNG
We have purchased JTAG-SMT2 products, and used in our programming products
Why JTAG-SMT2 does not directly use the 5V power supply USB connector to generate 3.3V POWER?
If so, this board design and use will be more simple
(Because of the need to provide an extra 3.3V power supply)
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Share on other sites
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