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PGA460-Q1: fail to UART with BOOSTXL-PGA460 from another MCU, How to power BOOSTXL-PGA460 from external power supplier ?

AaronD
Prodigy 130 points
Part Number: PGA460-Q1
Other Parts Discussed in Thread: BOOSTXL-PGA460, , MSP-EXP430F5529LP, PGA460

Hi, 

I am trying to build UART communication between a MCU board ( Infineon XC2267M) to BOOSTXL-PGA460 (PGA460-Q1 Ultrasonic Sensor Signal Conditioning EVM With Transducers).

================= the good sample from original EVM ==============================

the PGA460-Q1 EVM GUI is able to connect to MSP-EXP430F5529LP + BOOSTXL-PGA460 motherboard + BOOSTXL-PGA460 daughtercard, and Transducer echo data dump command run successfully. 

here is the observation and scope screen during UART communication

J1 pin 4 (UATX) measured 3.83V

J1 pin 1 (3v3) measured 3.9V

J1 pin 21 (5V) measured 5.37V

UART baud rate 192 kbps

================= the failed sample from  XC2267M board ==============================

As slau659b EVM guide instructed, BOOSTXL-PGA460 motherboard was modified as below.

a) power-mode-selector jumper block (J7), Pin3-4 Shorted

b) 12V applied to BOOSTXL-PGA460's J6  pin PWR

c) 3.3V applied to BOOSTXL-PGA460's J1 pin 1 (3v3)

d) J1 pin 22 (GND) wired to XC2267M MCU board

e) XC2267M MCU P1.2 (U2C1 RXD) fly wired to BOOSTXL-PGA460 J1 pin 3 (UARX )

f) XC2267M MCU P1.1 (U2C1 TXD) fly wired to BOOSTXL-PGA460 J1 pin 4 (UATX )

g) XC2267M MCU UART baudrate set to 57.6 kbps

h) XC2267M MCU UART Tx 0x55 0x09 0x4C 0xAA (Register read) which copied from EVM good sample

and here is the observation and scope screen, 

J1 pin 1 (3v3) measured 3.6V

J1 pin 4 (UATX) measured 5.38V, why good sample show 3.3v level?

J1 pin 3 (UARX) measured 5.31V, but not PGA460 response at all, why good sample show 0v level?

the EVM still works after restore the modification, Can someone check what I missed in my own config?

Thanks a lot

P1.2 U2C1 RXD
  • 0
    TI__Mastermind 27920 points

    Hi Aaron,

    Please check the following:

    • Does the XC2267M use a 3.3V or 5.0V logic level UART? If 5.0V, then the 100kOhm pull-up resistor (R13) from the PGA460 TEST pin to 3.3V must be installed. The PGA460 defaults to 3.3V logic level operation when the TEST pin is floating.
    • Ensure your XC2267M UART is configured for 8 bits, no parity, and 2 stop bits. 2 stop bits is important since most UART ports default to 1 stop bit.
    • The TXD pin of the XC2267M must be connected to the RXD pin of the PGA460. The RXD pin of the XC2267M must be connected to the TXD pin of the PGA460.
  • 0 in reply to Akeem Whitehead
    Prodigy 130 points

    Hi Akeem,

    Thank you so much for helping.

    XC2267M use 5.0V logic level UART, 

    here is the screen after I installed R13, this time I didn't apply J1 3v3 and 5v any voltage. and still no Rx from PGA460

    Channel #3 is J1 pin 1 (3v3) measured 0V

    Channel #2 is J1 pin 4 MCU UART TX

    Channel #1 is J1 pin 3 MCU UART RX

    What else signal I can check on BOOSTXL-PGA460?

    Thanks,

    Aaron

  • 0 in reply to AaronD
    Prodigy 130 points

    Hi Akeem,

    Thank you for the help 

    the issue was solved, beside R13 installed, I realized that 3.3V still required to apply to BOOSTXL-PGA460  J1  pin 1 (3V3LP) to enable U4.

    Aaron