4.3.3 Calibration Flow Demonstration

In this demonstration, the user can calibrate TX parameters and RX parameters of the PIC32CX-BZ2H using a PC with the installed MCHPRT3 tool.

Perform the following steps for the demonstration of the calibration flow (see the following figure):

  1. Set up the connection between the PIC32 WBZ451HPE Curiosity Board and PC. For more details, refer to Getting Started with MCHPRT3.
  2. Connect the u.FL connecter on the PIC32CX-BZ2H to Bluetooth/Zigbee tester (IQxel or others) to measure the RF power from the PIC32CX-BZ2H.
  3. Check the cable loss between the PIC32CX-BZ2H u.FL connecter to tester.
  4. MLDO is the preferred mode of calibration. Click PMU MLDO to use the MLDO mode to perform calibration.
  5. Select Save IB type (Flash/OTP).
    CAUTION: OTP is limited in memory of 4k, and it can only be calibrated for 10 to 15 times.
  6. Click Start Cal. to start the new calibration.
  7. Click VTA Cal in Cal. step 1. VTA and wait for done.
  8. Click Freq. Start in Cal. step 2. Freq., the DUT transmits the Bluetooth Low Energy packet at 2440 MHz.
  9. Check the carrier frequency at the tester and click Freq. decrease or Freq. increase to change the carrier frequency.
  10. Once the carrier frequency is close to 2440 MHz, click Freq. Done.
  11. Click LPA Start in step 3; read the power level in the tester, then enter it in the tool.
  12. Click LPA Power Tune in step 3; repeat steps 11 and 12 until the power level reaches the target power, 19.5 dBm ± 0.5 dB.
  13. Click LOFT/TXIQ/FLT Calibration in step 4 then wait for done.
  14. Click IRR Cal. Init. in step 5.
  15. Generate 2440 MHz CW tone at -90 dBm by using the tester, then feed it into DUT and click IRR -90 Loop Test 1.
  16. Generate 2436 MHz CW tone at -65 dBm by using the tester, then click IRR -65 Loop test 1.
  17. Repeat the steps 15 and 16, clicking IRR -90 Loop Test 2 – 4 and IRR -65 Loop test 2 – 4.
  18. Click IRR Cal. Done.
  19. Click Temp. SAR Cal in step 6 and wait for done.
  20. Click ED Cal. Init., generate 2440 MHz CW tone at -70 dBm by using the tester ED Cal. Trim in step 7.
  21. Click ED Cal. Done.
  22. Click Save Cal. Data in step 8 to save the calibration data into the file and the DUT.
Figure 4-14. MCHPRT3 PIC32CX-BZ2H GUI for Calibration Flow Demonstration
Figure 4-15. Calibration Setup