4.3.3 Calibration Flow Demonstration

In this demonstration, the user can calibrate TX parameters and RX parameters of the PIC32CX-BZ3 using a PC with the installed MCHPRT3 tool. The calibration step could be checked in the “Cal. Flow Status” in the Calibration page.

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

1. Set up the connection between the PIC32 WBZ351 Curiosity Board and PC. For more details, refer to Getting Started with MCHPRT3.
2. Connect the u.FL connecter on the PIC32CX-BZ3 to the Bluetooth/Zigbee tester (IQxel or others) to measure the RF power from the PIC32CX-BZ3.
3. Check the cable loss between the PIC32CX-BZ3 u.FL connecter to the Bluetooth/Zigbee tester.
4. MLDO is the preferred mode of calibration. Click PMU MLDO to use the MLDO mode to perform calibration.
   CAUTION: OTP is limited in memory of 4k, and it can only be calibrated 10 to 15 times.
5. Click Start Cal. to start the new calibration.
6. Click VTA Cal in Cal. step 1. VTA and wait for done.
7. Click Freq. Start in Cal. step 2. Freq., the DUT transmits the Bluetooth Low Energy packet at 2440 MHz.
8. Check the carrier frequency at the tester, then click Freq. decrease or Freq. increase to change the carrier frequency.
9. When the carrier frequency is close to 2440 MHz with +/-4 ppm, click Freq. Done.
10. Click IQ Cal. Start. in Cal. step 2. RX IQ.
11. Generate 2424 MHz CW tone from the test equipment at -50 dBm including cable loss by using the tester, then feed it into DUT and click IQ -50 Tune.
12. Generate 2426 MHz CW tone from the test equipment at -50 dBm including cable loss by using the tester, then click IQ Main Tune.
13. If IQ Cal. in step 11 and 12 are not a success, MCHPRT3 would require repeating IQ Cal. with -40 dBm or -30 dBm 2424 MHz and 2426 MHz CW tone by using the tester. Click IQ -40 Tune or IQ -30 Tune to repeat the step.
14. Click IQ Cal. Done.
15. Click TX P1 Start in Cal. step 4. RF TX, enter the power level shown in the tester with the cable loss, then click TX P1 Tune.
16. Click TX P2 Start in Cal. step 4. RF TX, enter the power level shown in the tester with the cable loss, then click TX P2 Tune.
17. Click TX P3 Start in Cal. step 4. RF TX, enter the power level shown in the tester with the cable loss, then click TX P3 Tune.
18. Click TX P4 Start in Cal. step 4. RF TX, enter the power level shown in the tester with the cable loss, then click TX P4 Tune.
19. Click TX P5 Start in Cal. step 4. RF TX, enter the power level shown in the tester with the cable loss, then click TX P5 Tune.
20. Click TX P6 Start in Cal. step 4. RF TX, enter the power level shown in the tester with the cable loss, then click TX P6 Tune.
21. Click ED Cal. Init., generate 2440 MHz CW tone at -70 dBm including cable loss by using the tester ED Cal. Trim in Cal. step 5. ED.
22. Click ED Cal. Done.
23. Click Save Cal. Data in Cal. step 6. Save data to save the calibration data into the file and the DUT.