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MSP430F5500: the minimum level of voltage and current be necessary for USB BSL FW Upgrade

Part Number: MSP430F5500

hi,

as the title, due to some reason, when my MSP430F5500 get into USB BSL, my MSP430's DVCC will be 2.5V, and the maximum current might be 10mA,

is it safe for my design while get into USB BSL mode?

below picture is the concept of my diagram.

  • Can't you (optionally) power the thing from USB?
  • Hi Erik,

    VBUS inputs to a 3.3 V LDO which is enabled by default (VUSBEN = 1) and therefore outputs 3.3 volts from VUSB, please refer to Figures 42-1 through 42-4 of the User's Guide. Due to the forward .7 V drop from the diode you see around 2.5 V on the DVCC and additional current to power the MSP430F5500 device. So long as the external current draw does not exceed 12 mA from VUSB (Section 5.44 of the datasheet) then your design should be fine. I would recommend that you review the MSP-TS430RGC64USB EVM for recommended USB connections.

    Regards,
    Ryan

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