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Original question:

CCS/TMS320C5545: Code composer V7 step by step lowpass fir filter implementation guide

CCS/TMS320C5545: c5545 booster pack power failure error, I2S1 connection.

V Pot
Expert 1975 points

Part Number: TMS320C5545

Tool/software: Code Composer Studio

Hi all,

I have tried connecting the booster pack i2s1 Dout, clk, fsync to dkwt32i bluetooth module's SDin, sclk, ws respectively. and i ran a loopback test to send digital data to the bluetooth module which is connected to a phone that records the audio outputing by booster pack. booster pack runs fine, but when i press record button on phone , boosterpack terminates with power failure on target cpu error.
do i've to set anything to make it work?

  • 0
    TI__Mastermind 29180 points
    Hi V Pot,

    Is the boosterpack connected to any Launchpad?
    It might be an issue with the level translator that is expecting one of the two VCC supplies to come from a LaunchPad.
    The level translator also translates the reset signal to the DSP, which can go low when the level translator is back-powered through one of the IOs.

    Regards,
    Mark
  • 0 in reply to Mark Mckeown
    Expert 1975 points
    Hi Mark,

    Thanks for the reply. NO, booster pack is not connected to any launchpad. just booster pack is connected to bluetooth module and both c5545bp and bluetooth module are connected separately to two different laptop usb ports to power them up
  • 0 in reply to V Pot
    Expert 1975 points

    Hi,

    Can some please resolve my issue.

    1) I’m trying to connect my dsp slave i2s output pin to a Bluetooth i2s input pin. Bluetooth module can be master or slave . I configured it as master since dsp output is slave. Also connected clk n fsync pins. Bluetooth module runs on 3.3v

    Issue:  booster pack is having power failure issues when i try to  transmit the data to Bluetooth.

  • 0 in reply to V Pot
    TI__Mastermind 29180 points
    Hi V Pot,

    Can you try wiring J7 pin 1 to 3.3V from TP3? See if that resolves your issue.

    Hope this helps,
    Mark
  • 0 in reply to Mark Mckeown
    Expert 1975 points

    Mark,

    may i know what do you mean by TP3? is it a header pin on booster pack?

  • 0 in reply to V Pot
    TI__Mastermind 29180 points
    Yes,

    TP3 is a thru-hole test point located next to the reset button. It taps into the 3.3V supply.
    When no launchpad is connected to the BoosterPack, VCC3V3_LP (J7 pin 1) is not supplied.
    The U12 and U13 level shifters therefore are missing a supply. Usually, it level shifts from 1.8V to 3.3V, but without VCC3V3_LP supplied, the 3.3V side is left floating. This can cause the LP_BUFF_SOFT_RST signal to drive low when a signal is driven into the unsupplied side of the level shifter. That is what I suspect is causing your power failure.

    If you have an oscilloscope, you can probe LP_BUFF_SOFT_RST at R2 to see if it in fact goes low.
    Wiring J7 pin 1 to TP3 should prevent this issue when the boosterpack is removed from any launchpad, but signals still go through the U12 and U13 level shifters.

    Schematics: www.ti.com/.../sprr233

    Hope this helps,
    Mark