nedoCPU-32 is one of the earliest 32-bit hobby kits on the DIY market (appeared in 2011 on NEDOCON web-store) based on PIC32MX in DIP package (through-hole!) that could be used as a 3.3V control board for your TTL-based 5V circuit - all inputs here are 5V-tolerant (thanks to diodes) and all outputs should be able to happily drive TTL circuits (3.3V is still considered HIGH logical level in terms of TTL). This board has fully open sourced design: Licensed under CERN OHL v.1.1 or above! PIC32MX has MIPS instruction set (32-bit!) and could be programmable in C programming language (you need MPLAB X free tool in order to program it). May work on 80 MHz (but 40 MHz is recommended for DIP packages). Internal or external crystal. Programmable by PICKit2 or PICKit3.

BOM - BILL OF MATERIALS:

• IC1: PIC32MX110F016B or PIC32MX170F256B

• IC2: LM1117T-3.3 or LD33

• Q1: N/A (optional)

• D1-D14: 1N4148 or 1N914

• LED1: 5-mm Red LED

• C1,C2: 10uF

• C5: 10uF (ceramic!)

• C3,C4,C6: 0.1uF (ceramic)

• C7: 100uF

• C8,C9: N/A (optional)

• R1: 10 Ohm

• R2: 10 kOhm

• R3,R4: 470 Ohm

• R5-R18: 220 Ohm

• S1: tact.button

• X1,X2,X3: 8-pin right angle headers

• X4: power terminal

• X5: 6-pin right angle header for ICSP

• JP1: jumpers (see below)

• and hardware to screw IC2 to the board

Jumpers:

• 1-2: connect output of IC2 (+3.3V) to onboard power

• 3-4: connect X1.7 to input of IC2 (external power 5V or more)

• 5-6 and 7-8: connect X1.3 and X1.4 to PIC32 w/o Q1

• 9-10: connect C6 to reset circuit (open when ICSP)

Bread-board friendly connector consists of THREE 8-pin headers:

First 8 pins - port A (X1):

• X1.1 (A0) - RA0, CTED1, RPA0, C3INC, AN0, CVREF+, VREF+

• X1.2 (A1) - RA1, CTED2, RPA1, AN1, CVREF-, VREF-

• X1.3 (A2) - RA2, RPA2, CLKI, OSC1 (NC if ext.crystal)

• X1.4 (A3) - RA3, PMA0, RPA3, CLKO, OSC2 (NC if ext.crystal)

• X1.5 (A4) - RA4, PMA1, CTED9, T1CK, RPA4, SOSCO

• X1.6 (3.3V)

• X1.7 (Vcc)

• X1.8 (Gnd)

Second 8 pins - port B (X2):

• X2.1 (B0) - RB0, RPB0, C3IND, C2INB, C1IND, AN2, PGED1

• X2.2 (B1) - RB1, CTED12, RPB1, C2INA, C1INC, AN3, PGEC1

• X2.3 (B2) - RB2, CTED13, SDA2, RPB2, C2IND, C1INB, AN4

• X2.4 (B3) - RB3, SCL2, RPB3, RTCC, C2INC, C1INA, AN5

• X2.5 (B4) - RB4, RPB4, SOSCI

• X2.6 (B5) - RB5, PMD7, RPB5, PGED3

• X2.7 (B6) - RB6, PMD6, RPB6, PGEC3

• X2.8 (B7) - RB7, INT0, PMD5, CTED3, RPB7, TDI

Third 8 pins - port C (X3):

• X3.1 (C0) - RB8, PMD4, CTED10, SCL1, RPB8, TCK

• X3.2 (C1) - RB9, PMD3, CTED4, SDA1, RPB9, TDO

• X3.3 (C2) - RB10, PMD2, CTED11, RPB10, PGED2

• X3.4 (C3) - RB11, PMD1, RPB11, TMS, PGEC2

• X3.5 (C4) - RB12, PMD0, AN12

• X3.6 (C5) - RB13, PMRD, CTPLS, RPB13, AN11

• X3.7 (C6) - RB14, PMWR, CTED5, SCK1, RPB14, C3INB, AN10, CVREFOUT

• X3.8 (C7) - RB15, PMCS1, CTED6, SCK2, RPB15, C3INA, AN9

As you can see 3rd header still called port C (as on other nedoCPU boards), but actually it's higher byte of port B of PIC32 (bits B8...B15).

By default you will get bare PCB without any components, but you can choose an option to get a KIT (PCB with set of components to build it yourself) or even pre-built and fully tested version of the board (most expensive option). Also you can choose which MCU you want (without choosing MCU you will not get any):

• PIC32MX110F016B - low-end MCU in this family with 16KB flash and 4KB data or

• PIC32MX170F256B - high-end MCU in this family with 256KB flash and 64KB data

ATTENTION: Customers outside of US can get PCB only or KIT without microcontroller! Sorry, but this chip is under export regulations...