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hello
In my application, I use a USB as a communication port AND charger for li- on battery
So far, the power supply of my application is 3,3v for my master MCU (Psoc4200L)
I kown that pin are mostly 5v tolerant, but I want to be sure that I can run my 4200 L at 3,3v without damage in my D+ D- and Vbus monitoring pin connect to the USB socket ( 5V)
If is not ok, can I use a shift level, between D-, D+, Vbus and MCU pin ?
Solved! Go to Solution.
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PSoC 4 MCU
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Hello,
USB will require a nominal voltage of 3.3 V for its operation. For applications with VBUS supply voltage in
the 5-V range (4.35 V to 5.25 V), it would be required enable the internal regulator.
Internal regulator will ensure that there is no damage.
To enable voltage regulator and use regulator for pull-up you need to pass the USBFS_5V_OPERATION Macro when calling the USBFS_Start() function, for example:
USBFS_Start(0, USBFS_5V_OPERATION);
Kindly let me know in case of any clarifications
Best Regards
Ekta
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Hello,
USB will require a nominal voltage of 3.3 V for its operation. For applications with VBUS supply voltage in
the 5-V range (4.35 V to 5.25 V), it would be required enable the internal regulator.
Internal regulator will ensure that there is no damage.
To enable voltage regulator and use regulator for pull-up you need to pass the USBFS_5V_OPERATION Macro when calling the USBFS_Start() function, for example:
USBFS_Start(0, USBFS_5V_OPERATION);
Kindly let me know in case of any clarifications
Best Regards
Ekta