Table of Contents
PIC32MZ, PIC32MX, PIC32MM, PIC32MK, PIC32C, and SAM Devices...................................................... 1
1. Frequently Asked Questions (FAQs).......................................................................................................4
2. List of Figures..........................................................................................................................................6
3. List of Tables........................................................................................................................................... 8
4. List of Equations......................................................................................................................................9
5. Introduction........................................................................................................................................... 10
5.1. User Issue Submission Instructions........................................................................................... 10
5.2. Microchip Client Support Services............................................................................................. 10
5.3. Microchip Technical Support Services........................................................................................10
6. Basic 32-Bit MCU Design and Troubleshooting Menu Checklist...........................................................11
7. MCU Start-up Problems........................................................................................................................ 12
7.1. VDD Ramp Rate.........................................................................................................................12
7.2. Power Bypassing........................................................................................................................13
7.3. Power Sequencing..................................................................................................................... 15
7.4. I/O Pin Current Injection from Remote Circuits.......................................................................... 16
7.5. Crystal Oscillators...................................................................................................................... 18
7.6. Clock Switching.......................................................................................................................... 21
8. Unexpected Resets...............................................................................................................................23
8.1. PIC32MX/PIC32MM POR/BOR................................................................................................. 23
8.2. PIC32MZ/PIC32MK/PIC32C POR/BOR.....................................................................................23
8.3. NMI and Exception Events......................................................................................................... 24
8.4. ESD/EMI/EFT Events.................................................................................................................24
9. Debug Issues........................................................................................................................................ 26
9.1. ICD4/REAL_ICE ICSP (PGDx/PGCx) Debug Issues.................................................................26
9.2. JTAG/SWD................................................................................................................................. 28
10. PCB MCU Connections.........................................................................................................................30
10.1. Exposed Pad..............................................................................................................................30
10.2. PIC32MX/PIC32MM/PIC32MZ/PIC32MK VUSB3V3 Pin........................................................... 30
10.3. MCLR#/RESETN........................................................................................................................31
10.4. VBAT.......................................................................................................................................... 31
11. Serial Data Corruption Errors................................................................................................................33
11.1. Impedance Matching..................................................................................................................33
11.2. Ground Loops.............................................................................................................................35
11.3. SPI/SQI...................................................................................................................................... 36
11.4. SD Host Controller (SDHC)........................................................................................................39
11.5. UART..........................................................................................................................................41
11.6. USB............................................................................................................................................43
11.7. CAN FD...................................................................................................................................... 47
© 2022 Microchip T
echnology Inc.
and its subsidiaries
Manual
DS70005439B-page 2
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