Board chipKIT Max32 - RetroBSD/retrobsd GitHub Wiki

Max32

Max32 board (schematics, manual, Eagle files) is an Arduino compatible board, based on Microchip PIC32MX795 microcontroller.

Features:

  • Microchip PIC32MX795 microcontroller 80 MHz (MIPS architecture)
  • 83 usable i/o pins
  • Compatible with Arduino Mega shields
  • MiniUSB connector with FTDI convertor to UART1
  • Power select switch: from USB or from external source
  • External power connector
  • One power LED and one user LED
  • Reset button

Memory:

  • 512 kbytes of Flash memory
  • 12 kbytes of additional boot Flash memory
  • 128 kbytes of RAM

Digital outputs can sink or source up to 18 mA. A rich set of peripheral functions is available: UART, SPI, I2C, ADC, timers. Two internal oscillators available: 8 MHz and 32 kHz. Power can be sourced from miniUSB, or from external power supply +7 ... 15 VDC.

Signals

Max32 pinout

PWM/Digital connector

Function PIC32 Signal Signal PIC32 Function
VREF- RA9 (28) 85 AREF RA10 (29) VREF+ 
      |RG13 (97)|  84  | GND  |  --     | GND
      |RG12 (96)|  83  | 13   |RA3  (59)| SDA2, LED
      |RG14 (95)|  82  | 12   |RA2  (58)| SCL2
      |RA7  (92)|  81  | 11   |RC4  (9) | SDI1
      |RA6  (91)|  80  | 10   |RD4  (81)|
      |RG0  (90)|  79  | 9    |RD3  (78)|
      |RG1  (89)|  78  | 8    |RD12 (79)|
      |RD7  (84)|  77  | 7    |RE9  (19)| INT2
      |RD13 (80)|  76  | 6    |RD2  (77)|

SOSCI |RC13 (73)| 75 | 5 |RD1 (76)| |RD9 (69)| 74 | 4 |RC14 (74)| SOSCO/ TDO |RA5 (61)| 73 | 3 |RD0 (72)| SDO1, INT0 TDI |RA4 (60)| 72 | 2 |RE8 (18)| INT1 TCK |RA1 (38)| 71 | 1 |RF8 (53)| SCL1A, SDO1A, U1ATX TMS |RA0 (17)| 70 | 0 |RF2 (52)| SDA1A, SDI1A, U1ARX

Communication connector

Signal PIC32 Function
TX3 14 RF13 (39) SCK3A
RX3 15 RF12 (40)
TX2 16 RF5 (50) SCL3A, SDO3A
RX2 17 RF4 (49) SDA3A, SDI3A
TX1 18 RD15 (48) SCK1A
RX1 19 RD14 (47)
SDA 20 RA15 (67) SDA1, INT4
SCL 21 RA14 (66) SCL1, INT3

Digital connector

Function PIC32 Signal Signal PIC32 Function 
                 |RC2  (7) | 22    | 23    |RC3  (8)  |
                 |VBUS (54)| 24    | 25    |RF3  (51) |
                 |RG3  (56)| 26    | 27    |RG2  (57) |
                 |RG15 (1) | 28    | 29 {3}|RG7  (11) | SDA2, SDI2A, U2ARX
                 |RE7  (5) | 30    | 31    |RE6  (4)  |
                 |RE5  (3) | 32    | 33    |RE4 (100) |
                 |RE3  (99)| 34    | 35    |RE2  (98) |
                 |RE1  (94)| 36    | 37    |RE0  (93) |

SCK1 |RD10 (70)| 38 | 39 |RD5 (82) | |RB11 (35)| 40 {a}| 41 {b}|RB13 (42) | |RB12 (41)| 42 {c}| 43 {4}|RG8 (12) | SCL2A, SDO2A, U2ATX VREF+ |RA10 (29)| 44 | 45 |RF0 (87) | |RF1 (88)| 46 | 47 |RD6 (83) | |RD8 (68)| 48 | 49 |RD11 (71) | SCL2A, SDO2A, U2ATX |RG8 (12)| 50 {1}| 51 {5}|RG7 (11) | SDA2, SDI2A, U2ARX SCK2A, U2BTX |RG6 (10)| 52 {2}| 53 {6}|RG9 (14) | U2BRX

Notes:

  • {1} Also JP3, JP4
  • {2} Also J13-03
  • {3} Also JP3, JP4
  • {4} Also JP3, JP4
  • {5} Also JP3, JP4
  • {6} Also J13-05
  • {a} Also A11
  • {b} Also A13
  • {c} Also A12

Analog connector

Signal PIC32 Function
A0 RB0 (25) PGED1
A1 RB1 (24) PGEC1
A2 RB2 (23)
A3 RB3 (22)
A4 RB4 (21)
A5 RB5 (20)
A6 RB6 (26) PGEC2
A7 RB7 (27) PGED2
A8 RB8 (32)
A9 RB9 (33)
A10 RB10 (34)
A11 {7} RB11 (35)
A12 {8} RB12 (41)
A13 {9} RB13 (42)
A14 RB14 (43)
A15 RB15 (44)

Notes:

  • {7} Also 40
  • {8} Also 42
  • {9} Also 41

Power connector

Signal PIC32 Function
RST (13) MCLR
3V3 VCC +3.3
5V0 VCC +5.0
GND GND
GND GND
VIN External supply voltage

UART and SPI pins

UART SPI PIC32 Connector
U1RX (U1ARX) SDI3 RF2 (52) 0 - PWM/Digital, USB
U1TX (U1ATX) SDO3 RF8 (53) 1 - PWM/Digital, USB
U3RX (U2ARX) SDI2 RG7 (11) 29 - Digital, JP3-JP4
U3TX (U2ATX) SDO2 RG8 (12) 43 - Digital, JP3-JP4
U2RX (U3ARX) SDI4 RF4 (49) RX2 17 - Communication
U2TX (U3ATX) SDO4 RF5 (50) TX2 16 - Communication
U4RX (U1BRX) -- RD14 (47) RX1 19 - Communication
U4TX (U1BTX) SCK3 RD15 (48) TX1 18 - Communication
U6RX (U2BRX) -- RG9 (14) 53 - Digital, J13-05
U6TX (U2BTX) SCK2 RG6 (10) 52 - Digital, J13-03
U5RX (U3BRX) -- RF12 (40) RX3 15 - Communication
U5TX (U3BTX) SCK4 RF13 (39) TX3 14 - Communication
-- SCK1 RD10 (70) 38 - Digital
-- SDI1 RC4 (9) 11 - PWM/Digital
-- SDO1 RD0 (72) 3 - PWM/Digital

SD card shield

For SD and micro-SD cards, a MakerStudio SD Card Shield is recommended (User Guide, schematic). You can use only one card (either SD or micro-SD) on MakerStudio shield, alternatively selected by SW1 switch.

SD shield

List of connections:

Max32 Signal SD/MMC board
4 RC14 - /CS0 CS card0
43 RG8 - SDO2 DI
52 RG6 - SCK2 CLK
51 RG7 - SDI2 DO

Ethernet and WiFi shields

Arduino Ethernet shield R3 or chipKIT WiFi shield would work as well: they have essentially the same connection schematics for micro-SD card.

Ethernet shield

WiFi shield