8.2 BOARD REVISION
Remember to check the schematics and the board design files to verify any differences between the
different board revisions.
Board revision
Notable changes
B
Initial release of the board
C
1. Q1 crystal Q1 gets properly labeled as Q12.000MHz/HC-
49S/SMD/20pF/30ppm (changed from 24MHz); the same quartz was placed
in previous hardware revisions but the schematic value was not
updated
2. Crystal capacitors (C29, C32) were changed from 27pF to 20pF as
is required in the errata: "C2=Cload, C1=Cload-2pF" and to have
reserve of several pFs, because during production, always the
capacitance is a little higher than expected
3. R36=10k pull-up to 3.3V was added to the OSCO pin, i.e. MCU
pin<72>;
C1
1. The main processor was changed from PIC32MZ2048ECG144-I/PH to
PIC32MZ2048EFG144-I/PH (the ECG was declared "not recommended for
new designs" by Microchip);
2. R36 was changed from 10k to 1.5k;
3. Removed quartz Q1. Q1, C29, C32 and R30 were changed to NA –
this is because of the errata sheets of both chips. Refer to 4;
4. Added oscillator CD1 instead. CD1 is 24MHz oscillator;
5. Q2, C30 and C31 were changed to NA.
8.3 USEFUL WEB LINKS
Visit the links below for more information and resources for the product:
•
PIC32-HMZ144 official product page:
https://www.olimex.com/Products/PIC/Development/PIC32-HMZ144/
•
PIC32-HMZ144 at GitHub (EAGLE CAD source files):
https://github.com/OLIMEX/PIC32-HMZ144
•
MPLAB Harmony framework – flexible, abstracted, fully integrated firmware development
platform for PIC32 microcontrollers:
MPLAB Harmony page
•
Official Olimex forums:
https://www.olimex.com/forum/index.php?board=21.0
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