Olimex PIC32-MAXI-WEB User guide

PIC32-MAXI-WEB

Open-source single-board

Android/ Linux mini-computer

USER’S MANUAL

Revision B, December 2013

Designed by OLIMEX Ltd, 2013

All boards produced by Olimex LTD are ROHS compliant

DISCLAIMER

© 2013 Olimex Ltd. Olimex®, logo and combinations thereof, are registered trademarks of Olimex Ltd. Other product
names may be trademarks of others and the rights belong to their respective owners.

The information in this document is provided in connection with Olimex products. No license, express or implied
or otherwise, to any intellectual property right is granted by this document or in connection with the sale of
Olimex products.

This hardware design of PIC32-MAXI-WEB is neither public not open-source. Any copying of the product would result
in copyright infringement.

The software is released under the terms that are detailed in the agreement page, that pops-up when you attempt to
download a demo software archive.

It is possible that the pictures in this manual differ from the latest revision of the board.

The product described in this document is subject to continuous development and improvements. All particulars of the
product and its use contained in this document are given by OLIMEX in good faith. However all warranties implied or
expressed including but not limited to implied warranties of merchantability or fitness for purpose are excluded. This
document is intended only to assist the reader in the use of the product. OLIMEX Ltd. shall not be liable for any loss or
damage arising from the use of any information in this document or any error or omission in such information or any
incorrect use of the product.

This evaluation board/kit is intended for use for engineering development, demonstration, or evaluation purposes only
and is not considered by OLIMEX to be a finished end-product fit for general consumer use. Persons handling the
product must have electronics training and observe good engineering practice standards. As such, the goods being
provided are not intended to be complete in terms of required design-, marketing-, and/or manufacturing-related
protective considerations, including product safety and environmental measures typically found in end products that
incorporate such semiconductor components or circuit boards.

Olimex currently deals with a variety of customers for products, and therefore our arrangement with the user is not
exclusive. Olimex assumes no liability for applications assistance, customer product design, software performance, or
infringement of patents or services described herein.

THERE IS NO WARRANTY FOR THE DESIGN MATERIALS AND THE COMPONENTS
USED TO CREATE PIC32-MAXI-WEB. THEY ARE CONSIDERED SUITABLE ONLY
FOR PIC32-MAXI-WEB.

Page 2 of 22

Table of Contents

DISCLAIMER ............................................................................................................. 2

1. INTRODUCTION ................................................................................................... 4

1.1 BOARD FEATURES ............................................................................................................... 4

1.2 ELECTROSTATIC WARNING: ............................................................................................ 4

1.3 BOARD USE REQUIREMENTS: ......................................................................................... 4

1.4 BOARD LAYOUT ................................................................................................................... 5

2. MICROCONTROLLER DETAILS ...................................................................... 6

2.1 FEATURES .............................................................................................................................. 6

2.2 BLOCK DIAGRAM ................................................................................................................ 8

2.3 MEMORY MAP ...................................................................................................................... 9

3 BOARD SCHEMATIC AND DIMENSIONS ...................................................... 10

3.1 SCHEMATIC ......................................................................................................................... 10

3.2 PHYSICAL DIMENSIONS .................................................................................................. 12

4. CONTROL CIRCUITRY ..................................................................................... 13

4.1 POWER SUPPLY CIRCUIT ................................................................................................ 13

4.2 RESET CIRCUIT .................................................................................................................. 13

4.3 CLOCK CIRCUIT ................................................................................................................ 13

5. JUMPERS, CONNECTORS AND INTERFACES ............................................ 14

5.1 JUMPER DESCRIPTION .................................................................................................... 14

5.2 INPUT/OUTPUT ................................................................................................................... 14

5.3 EXTERNAL CONNECTOR DESCRIPTION .................................................................... 15

5.3.1 PWR_JACK .................................................................................................................................................. 15

5.3.2 ICSP CONNECTOR .................................................................................................................................... 15

5.3.3 RS232/UART ................................................................................................................................................. 16

5.3.6 CAN1 AND CAN2 ........................................................................................................................................ 17

5.3.7 JTAG .............................................................................................................................................................. 17

5.3.8 UEXT1 ........................................................................................................................................................... 18

5.3.9 UEXT2 ........................................................................................................................................................... 18

5.3.10 MICROSD CARD ...................................................................................................................................... 19

6. AVAILABLE DEMO SOFTWARE ...................................................................... 20

7. REVISION AND ORDERING INFORMATION .............................................. 21

7.1 DOCUMENT REVISION ..................................................................................................... 21

7.2 BOARD REVISION .............................................................................................................. 21

8. WARRANTY AND SUPPORT ............................................................................. 22

Page 3 of 22

1. INTRODUCTION

This board features a PIC32 processor with embedded 100Mbit Ethernet module which allows you
to easily develop network applications. It has everything you would normally need for such
applications: power relays which you can command through a web interface, a large 240x320 TFT
LCD with touchscreen support (that allows the development of complex graphical user interface
applications), digital opto-isolated inputs, trimmer potentiometer, accelerometer with integrated
temperature sensor, two CAN interface channels, RS232 interface, USB On-The-Go and micro SD
card slot to store large amounts of data. With this board you can easily automate your home and
then control and monitor it from any point in the world via Internet. An extension connector is
available so you can connect custom made hardware to the board. The PIC32MX795F512L has
512K Flash memory (plus an additional 12 KB of Boot Flash).

1.1 BOARD FEATURES

The notable board features are listed below:

 PIC32MX795F512L high-performance, USB, CAN and Ethernet 32-bit Flash

microcontroller

 TFT LCD 320x240 65k colors with resistive touchscreen
 Debug interface – JTAG and ICSP
 RESET circuit
 Reset button
 Two opto-isolated digital inputs with indicator LEDs
 Two CAN interfaces
 100Mbit Ethernet interface
 Two UEXT connectors to connect to other Olimex boards
 Accelerometer with integrated temperature sensor
 MicroSD card holder
 Two relays 10A/250VAC with indicator LEDs
 USB On-The-Go
 RS232 interface
 Trimmer connected to analog input
 Three user LEDs
 Stand-alone power LED
 Three user buttons
 3.3V voltage regulator
 Dimensions 140x100 mm (5.51x3.94")

1.2 ELECTROSTATIC WARNING:

The PIC32-MAXI-WEB board is shipped in protective anti-static packaging. The board must not be
subject to high electrostatic potentials. General practice for working with static sensitive devices
should be applied when working with this board.

1.3 BOARD USE REQUIREMENTS:

Cables: the board needs external power supply cable and mini ICSP cable (connected to the
respective debugger) in order to test basic functionality. Depending on the peripherals used you may
also need and Ethernet RJ45 terminated cable, 9pin RS232 cable, miniUSB cable.

Page 4 of 22

Hardware: The board requires +12V regulated power supply.

!!! Please note that the PIC32 processor on this board is not supported by the once famous ICD2
programmer/debugger and derivatives. You would need a newer debugger/programmer. Please
ensure your programmer/debugger is compatible with PIC32 microcontrollers.

1.4 BOARD LAYOUT

Page 5 of 22

2. MICROCONTROLLER DETAILS

Some of the details about the main microcontroller in PIC32-MAXI-WEB (PIC32MX795F512L)
microcontroller are mentioned in this chapter. It is highly recommended to refer to the original
datasheet which might be downloaded from the official Microchip web-side.

2.1 FEATURES

PIC32-MAXI-WEB board uses MCU PIC32MX795F512L from Microchip Technology that packs
the following features:

High-Performance 32-bit RISC CPU:

 MIPS32® M4K® 32-bit core with 5-stage pipeline
 80 MHz maximum frequency
 1.56 DMIPS/MHz (Dhrystone 2.1) performance at zero Wait state Flash access
 Single-cycle multiply and high-performance divide unit
 MIPS16e™ mode for up to 40% smaller code size
 Two sets of 32 core register files (32-bit) to reduce interrupt latency

Prefetch Cache module to speed execution from Flash
Microcontroller Features:

 Operating voltage range of 2.3V to 3.6V
 512K Flash memory (plus an additional 12 KB of Boot Flash)
 128K SRAM memory
 Pin-compatible with most PIC24/dsPIC® DSC devices
 Multiple power management modes
 Multiple interrupt vectors with individually programmable priority
 Fail-Safe Clock Monitor mode
 Configurable Watchdog Timer with on-chip Low-Power RC oscillator for reliable operation

Peripheral Features:

 Atomic SET, CLEAR and INVERT operation on select peripheral registers
 8-channels of hardware DMA with automatic data size detection
 USB 2.0-compliant full-speed device and On-The-Go (OTG) controller:

 Dedicated DMA channels

 10/100 Mbps Ethernet MAC with MII and RMII interface:

 Dedicated DMA channels

 CAN module:

 2.0B Active with DeviceNet™ addressing support

 Dedicated DMA channels
 3 MHz to 25 MHz crystal oscillator
 Internal 8 MHz and 32 kHz oscillators
 Six UART modules with:

 RS-232, RS-485 and LIN 1.2 support

 IrDA® with on-chip hardware encoder and decoder
 Four SPI modules
 Five I2C™ modules
 Separate PLLs for CPU and USB clocks
 Parallel Master and Slave Port (PMP/PSP) with 8-bit and 16-bit data, and up to 16 address

lines
 Hardware Real-Time Clock and Calendar (RTCC)

Page 6 of 22

 Five 16-bit Timers/Counters (two 16-bit pairs combine to create two 32-bit timers)
 Five Capture inputs
 Five Compare/PWM outputs
 Five external interrupt pins
 High-speed I/O pins capable of toggling at up to 80 MHz
 High-current sink/source (18 mA/18 mA) on all I/O pins
 Configurable open-drain output on digital I/O pins

Debug Features:

 Two programming and debugging Interfaces:

 2-wire interface with unintrusive access and real-time data exchange with application

 4-wire MIPS® standard enhanced Joint Test Action Group (JTAG) interface
 Unintrusive hardware-based instruction trace
 IEEE Standard 1149.2 compatible (JTAG) boundary scan

Analog Features:

 16-channel, 10-bit Analog-to-Digital Converter:

 1 Msps conversion rate

 Conversion available during Sleep and Idle
 Two Analog Comparators
 5V tolerant input pins (digital pins only)

Page 7 of 22

2.2 BLOCK DIAGRAM

A block diagram with main functional parts of the microcontroller as seen in the official Microchip
documentation.

Page 8 of 22

2.3 MEMORY MAP

The microcontroller's memory regions as seen in the official Microchip documentation.

Page 9 of 22

3 BOARD SCHEMATIC AND DIMENSIONS

In this chapter you may find information about the schematics describing logically and physically
PIC32-MAXI-WEB.

3.1 SCHEMATIC

The schematic of PIC32-MAXI-WEB is available for reference on the next page.

Only the board schematic is available to the customer. It is available only as a stand-alone PDF
document and as a reference image on. The board design files are kept private.

If you are looking for a schematic of an older revision of the board and it isn't available at our web
site you may request it by the support e-mail.

Page 10 of 22

PIC32-MAXI-WEB, board revision A:

Page 11 of 22

CLOSE

CLOSE

CLOSE

10k

T1103NE-DTSM-21R(12x12x4.3mm)

T1103NE-DTSM-21R(12x12x4.3mm)

T1103NE-DTSM-21R(12x12x4.3mm)

100nF

100nF 100nF 100nF 100nF

100nF

39pF

39pF

27pF

27pF

100nF

10uF/6.3V/TANT

100nF

10uF/6.3V/T ANT

100nF

100nF

100nF

100nF

100nF

10uF/6.3V/T ANT

100nF

100nF

10uF/6.3V/TA NT

100nF

10uF/6.3V/TANT

100nF

100nF

47uF/6.3V/T ANT

100nF

10uF/6.3V

100nF

100nF100nF

NA(100nF)NA(100nF)NA(100nF)100nF

47uF/6.3V/TANT

NA(10uF/6.3V)

100nF

47uF/6.3V/TANT

1000uF/6.3V/8x12/low_ ESR

220uF/10V/tant

10uF/16V/TANT

NA(10nF)

4.7nF

100nF

2.2uF

10uF/16V/TANT

1000uF/16VDC

100nF

10uF/6.3V/T ANT

100nF

100nF

100nF

100nF

100nF

2.2uF100nF

100nF

100nF

100nF

10uF/6.3V

47uF/6.3V/TA NT

TB3-3.5mm

OPEN

CLOSE

TB3-3.5mm

OPEN

CLOSE

6NC2-50MHz

1N4148

1N4148

1N5819(SS14)

1N4148

1N5819(SS14)

1N5819(SS14)

1N4148

1N4148

FB0805/600R/200mA(201209-601)

FB0805/600R/200mA(201209-601)

FB0805/600R/200mA(201209-601)

FB0805/600R/200mA(2 01209-601)

IRLML6402

WF6S

TB2-3.5mm

TB2-3.5mm

BH14S(PIN<1 2>-CUT!)

15uH/DBS135

CL470nH/0805/1.76R/250mA

RJLBC-060TC 1

GYX-SD-TC0805SYC(YELLOW)

GYX-SD-TC0805SGC(GREEN)

GYX-SD-TC0805SURK(RED)

GYX-SD-TC0805SURK(RED)

GYX-SD-TC0805SURK(RED)

GYX-SD-TC0805SURK(RED)

GYX-SD-TC0805SURK(RED)

H11A817SMD

H11A817SMD

+5V

2.5V

+5V

+12V

+12V+12V

+5V

+5V

GYX-SD-TC0805SURK(RED)

YDJ-1134

Q8.000MHz/20pF/HC-49SM(SMD)

QCT32768(2x6)/6pF

49.9R/1%NA49.9R/1%

49.9R/1%

49.9R/1%

1.5K/1%

4.99k/1%

10k

10k

1k

1k1k1k1k1k

100k

1k

1k1k1k

1k

4.7k

330R

330R

330R

NA

1k

4.7k

0R(NA)
NA
NA

NA

4.7k

0R(NA)
NA
NA

10k

0R(NA)
NA

4.7k

0R(NA)
NA

4.7k

10k

1M
10k

100k
100k
100k

1k

0R(NA)

1k 1k

330R

10k

330R

NA N A NA

100k

100k

0R(NA)

100k

1k

330R

NA(100R)

10k

330R

NA(100R)

10k

330R

NA(100R)

10k

330R

240R/1%

390R/1%

4.99k/1%15k/1%

4.99k/1%

150k

4.7k

68k

330R330R330R

330R

330R

NA

10k

10k

0R(NA)

NA(4.7k)

NA(4.7k)

10k

120R

0R(NA)

NA(4.7k)

4.7k

10k

120R

4.7k

330R

330R

4.7k

330R

HD-515R_6P

RAS-12-15 RAS-12-15

T1107A(6x3.8x2.5mm)

DB9-F

MICRO

DTC114YKA DTC114YKA

DTC114YKA

FS-K320QVB -V1

PIC32MX795F 512L-80I/PT

KS8721BLMM

SMB380,(QFN 10)

NA(MCP130T)

ST3232(SO16 )

LM3526M-L(SO8)

MCP2551

MCP2551

BH10S

BH10S

MICRO_AB

3.3V

3.3V

3.3VA

3.3V3.3V

3.3V

3.3V

3.3V

3.3V

3.3V

3.3V

3.3V

3.3V

3.3V3.3V

3.3V

AGNDAGND AGND

3.3VA

3.3V

3.3V 3.3V

3.3V

3.3V

3.3V

3.3V

3.3V

3.3V

3.3V

3.3V

3.3V

3.3V

3.3V

3.3V

3.3V

3.3V

3.3V

3.3V

3.3V

3.3V

3.3V

3.3V

3.3V3.3V

3.3V

3.3V

3.3V

3.3VA

AGND

AGND

3.3V

3.3V

3.3V

3.3V

CLOSE

BD9778HFP

LM1117IMP X-ADJ

TDI,TDO,TMS,TCK

+5V_VBUS

+5V_VBUS

+5V_VBUS

/TFT_CS

/TFT_CS

/TFT_RST

/TFT_RST

AC1RX

AC1RX

AC1RX

AC1TX/SCK3A

AC1TX/SCK3 A

AC1TX/SCK3A

AC1TX/SCK3A

AC2RX

AC2RX

AC2TX

AC2TX

ACC_INT

ACC_INT

AERXD0

AERXD0

AERXD1

AERXD1

AERXERR

AERXERR

AETXD0

AETXD0

AETXD1

AETXD1

AETXEN

AETXEN

AETXEN

CS_MMC

CS_MMC

EMDC

EMDC

EMDIO

EMDIO

ERXDV

ERXDV

IN1

IN1

IN2

IN2

LED1

LED1

LED2

LED2

LED3

LED3

LED100/DUP

LEDACT

MISO1

MISO1

MISO3A

MISO3A

MISO3A

MISO3A

MOSI1

MOSI1

MOSI3A

MOSI3A

MOSI3A

MOSI3A

PC_CD PC_CTS

PC_CTS PC_RTS

PC_RTS

PC_RXD

PC_RXD

PC_TXD PC_TXD

PGEC2

PGEC2

PGED2

PGED2

PHY_IRQ

PHY_IRQ

PHY_IRQ

PHY_REFCLK

PHY_REFCLK

PHY_RSTN

PHY_RSTN

PHY_VDD_PLL

PHY_VDD_PLL

PMD0

PMD0

PMD1

PMD1

PMD2

PMD2

PMD3

PMD3

PMD4

PMD4

PMD5

PMD5

PMD6

PMD6

PMD7

PMD7

PMD8

PMD8

PMD9

PMD9
PMD10

PMD10

PMD11

PMD11 PMD12

PMD12

PMD13

PMD13

PMD13

PMD14

PMD14

PMD14 PMD15

PMD15

PMD15

PMRD

PMRD

PMWR

PMWR

RELAY1

RELAY1

RELAY2

RELAY2

RSTN

RSTN

RSTN

RSTN

RXD1

RXD1

RXD1

RXD1_INT

RXD1_INT

SCK1

SCK1

SCL1

SCL2

SCL2

SCL2

SDA1

SDA2

SDA2

SDA2

SW_SCL1

SW_SCL1

SW_SDA1

SW_SDA1

SW_U2RX

SW_U2RX

SW_U2TX

SW_U2TX

TCK

TCK

TDI

TDI

TDO

TDO

TFT_LIGHT

TFT_LIGHT

TFT_RS

TFT_RS

TMS

TMS

TRIM

TRIM

TXD1

TXD1

TXD1

U2RXU2TX

UEXT1_CS

UEXT1_CS

UEXT2_CS

UEXT2_CS

USBID

USBID USBID

USB_D+USB_D+

USB_D+

USB_D-

USB_D-USB_D-

USB_FAULT

USB_FAULT

VBUSON

VBUSON

XL

XL

XR

XR

YD

YD

YU

YU

3.3V

3.3VA

1 2

3.3VA_E

1 2

3.3V_E

AGND

1 2

AGND_E

AN_TR

BUT1 BUT2 BUT3

C1 C2 C3 C4 C5 C6

C7

C8

C9

C10

C11C12

C13

C14

C15

C16

C17

C18

C19

C20

C21

C22

C23

C24

C25

C26

C27

C28

C29

C30

C31

C32C33

C34C35C36C37

C38

C39

C40

C41

C42

C43

C44

C45

C46

C47

C48

C49

C50

C51

C52

C53

C54

C55

C56

C57

C58C59

C60

C61

C62

C63

C64

1

2

3

CAN1

12

CAN1_D

1 2

CAN1_T

1

2

3

CAN2

12

CAN2_D

1 2

CAN2_T

1

3

4

2

CD1

CTS

D1 D2

D3

D4

D5

D6

D7

D8

FB1

FB2

FB3

FB4

FET1

GND

1
2
3
4
5
6

ICSP

1

2

IN1

1

2

IN2

1 2

3 4

5 6

7 8

9 10

11 12

13 14

JTAG

L1

L2

AG

AG

AY

AY

COM

3

KG

KG

KY

KY

NC

6

RD+

7

RD-

8

TD+

1

TD-

2

7575

7575

1nF/2kV

1
4
5
2

3
7
8
6

GREEN

YELLOW

LAN

LED1 LED2 LED3

LED_IN1

LED_IN2

LED_R1

LED_R2

124

3

OPT1

124

3

OPT2

PWR

PWR_JACK

Q1

Q2

R1R2R3R4R5

R6

R7

R8

R9

R10

R11

R12

R13

R14

R15

R16

R17

R18

R19

R20

R21

R22

R23

R24

R25

R26

R27

R28

R29
R30
R31

R32

R33

R34
R35
R36

R37

R38
R39
R40

R41
R42
R43

R44

R45
R46

R47
R48
R49

R50

R51

R52 R53

R54

R55

R56

R57 R58 R59

R60

R61

R62

R63

R64

R65

R66

R67

R68

R69

R70

R71

R72

R73

R74

R75

R76

R77R78

R79

R80

R81

R82

R83R84R85

R86

R87

R88

R89

R90

R91

R92

R93

R94

R95

R96

R97

R98

R99

R100

R101

R102

R103

R104

R105

1
2
3
4
5
6

REL

REL1

REL1

REL2

REL2

RESET

1
2
3
4
5

6
7
8
9

G1

G2

RS232

RTS

CD/DAT3/CS

2

CLK/SCLK

5

CMD/DI

3

DAT0/DO

7

DAT1/RES

8

DAT2/RES

1

VDD

4

VSS

6

SD/MMC

T1 T2

T3

#CS

4

#RD

7

#RESET

8

#WR

6

DB0

9

DB1

10

DB2

11

DB3

12

DB4

13

DB5

14

DB6

15

DB7

16

DB8

17

DB9

18

DB10

19

DB11

20

DB12

21

DB13

22

DB14

23

DB15

24

GND

1

GND

25

GND

37

LEDA

35

LEDA

36

LEDK1

30

LEDK2

31

LEDK3

32

LEDK4

33

LEDK5

34

RS

5

VCC

2

VCC

3

XL

27

XR

29

YD

26

YU

28

TFT

#MCLR

13

#SS1/IC2/RD9

69

AC1RX/#SS3A/U3BRX/U3ACTS/RF12

40

AC1TX/SCK3A/U3BTX/#U3ARTS/RF13

39

AERXD0/INT1/RE8

18

AERXD1/INT2/RE9

19

AERXERR/RG15

1

AETXCLK/SCL1/INT3/RA14

66

AETXD0/#SS1A/U1BRX/#U1ACTS/CN20/RD14

47

AETXD1/SCK1A/U1BTX/#U1ARTS/CN21/RD15

48

AETXEN/SDA1/INT4/RA15

67

AN2/C2IN-/CN4/RB2

23

AN3/C2IN+/CN5/RB3

22

AN4/C1IN-/CN6/RB4

21

AN5/C1IN+/VBUSON/CN7/RB5

20

AN8/C1OUT/RB8

32

AN9/C2OUT/RB9

33

AN10/CVREFOUT/PMA13/RB10

34

AN11/ERXERR/AETXERR/PMA12/RB11

35

AN12/ERXD0/AECRS/PMA11/RB12

41

AN13/ERXD1/AECOL/PMA10/RB13

42

AN14/ERXD2/AETXD3/PMALH/PMA1/RB14

43

AN15/ERXD3/AETXD2/OCFB/PMALL/PMA0/CN12/RB15

44

AVDD

30

AVSS

31

C1RX/ETXD1/PMD11/RF0

87

C1TX/ETXD0/PMD10/RF1

88

C2RX/PMD8/RG0

90

C2TX/ETXERR/PMD9/RG1

89

D+/RG2

57

D-/RG3

56

ECOL/SCK2A/U2BTX/#U2ARTS/PMA5/CN8/RG6

10

ECRS/SDA2A/SDI2A/U2ARX/PMA4/CN9/RG7

11

EMDC/IC4/PMCS1/PMA14/RD11

71

ERXCLK/#SS2A/U2BRX/#U2ACTS/PMA2/CN11/RG9

14

ERXDV/SCL2A/SDO2A/U2ATX/PMA3/CN10/RG8

12

ETXCLK/PMD15/CN16/RD7

84

ETXD2/IC5/PMD12/RD12

79

ETXD3/PMD13/CN19/RD13

80

ETXEN/PMD14/CN15/RD6

83

OC2/RD1

76

OC3/RD2

77

OC4/RD3

78

OC5/PMWR/CN13/RD4

81

OSC1/CLKI/RC12

63

OSC2/CLKO/RC15

64

PGEC1/AN1/CN3/RB1

24

PGEC2/AN6/OCFA/RB6

26

PGED1/AN0/CN2/RB0

25

PGED2/AN7/RB7

27

PMD0/RE0

93

PMD1/RE1

94

PMD2/RE2

98

PMD3/RE3

99

PMD4/RE4

100

PMD5/RE5

3

PMD6/RE6

4

PMD7/RE7

5

PMRD/CN14/RD5

82

RTCC/EMDIO/IC1/RD8

68

SCK1/IC3/PMCS2/PMA15/RD10

70

SCL1A/SDO1A/U1ATX/RF8

53

SCL2/RA2

58

SCL3A/SDO3A/U3ATX/PMA8/CN18/RF5

50

SDA1A/SDI1A/U1ARX/RF2

52

SDA2/RA3

59

SDA3A/SDI3A/U3ARX/PMA9/CN17/RF4

49

SDO1/OC1/INT0/RD0

72

SOSCI/CN1/RC13

73

SOSCO/T1CK/CN0/RC14

74

T2CK/RC1

6

T3CK/AC2TX/RC2

7

T4CK/AC2RX/RC3

8

T5CK/SDI1/RC4

9

TCK/RA1

38

TDI/RA4

60

TDO/RA5

61

TMS/RA0

17

TRCLK/RA6

91

TRD0/RG13

97

TRD1/RG12

96

TRD2/RG14

95

TRD3/RA7

92

USBID/RF3

51

VBUS

54

VCAP/VDDCORE

85

VDD

2

VDD

16

VDD

37

VDD

46

VDD

62

VDD

86

VREF+/CVREF+/AERXD3/PMA6/RA10

29

VREF-/CVREF-/AERXD2/PMA7/RA9

28

VSS

15

VSS

36

VSS

45

VSS

65

VSS

75

VUSB

55

U1

COL/RMII21CRS/RMII_BTB

22

FXSD/FXEN

34

GND1

8

GND2

12

GND3

23

GND4

35

GND5

36

GND639GND743GND8

44

INT/PHYAD0

25

LED0/TEST

26

LED1/SPD100/NFEF

27

LED2/DUPLEX

28

LED3/NWAYEN

29

MDC

2

MDIO

1

PD#

30

REXT

37

RST#

48

RX+

33

RX-

32

RXC

10

RXD0/PHYAD4

6

RXD1/PHYAD3

5

RXD2/PHYAD2

4

RXD3/PHYAD1

3

RXDV/CRSDV/PCS_LPBK

9

RXER/ISO

11

TX+

41

TX-

40

TXC/REFCLK15TXD017TXD118TXD219TXD320TXEN16TXER14VDDC

13

VDDIO1

7

VDDIO2

24

VDDPLL

47

VDDRCV

38

VDDRX

31

VDDTX

42XI46XO45

U2

CSB

5

GND

3

INT

4

NC1

1

NC2

10

SCK

6

SDI/SDA

8

SDO

7

VDD

2

VDDIO

9

U3

3

1 2

GND

VCCRESET

U4

C1+

1

C1-

3

C2+

4

C2-

5

R1IN

13

R1OUT

12

R2IN

8

R2OUT

9

T1IN

11

T1OUT

14

T2IN

10

T2OUT

7

V+

2

V-

6

U5

15 16

GND VCC

U5PWR

#ENA

1

#ENB

4

FLAG_A

2

FLAG_B

3

GND

6

IN

7

OUT_A

8

OUT_B

5

U6

CANH

7

CANL

6

RS

8

RXD

4

TXD

1

VDD

3

VREF

5

VSS

2

U7

CANH

7

CANL

6

RS

8

RXD

4

TXD

1

VDD

3

VREF

5

VSS

2

U8

1 2
3 4
5 6
7 8
9 10

UEXT1

1 2
3 4
5 6
7 8
9 10

UEXT2

D+

D-

GND

GND1

GND2

GND3

GND4

ID

VBUS

USB_OTG

12

VDD_E

EN/SYNC

7

FB

3

GND

4

INV

5

RT

6SW2

VIN

1

VR1

ADJ/GND

IN OUT

VR1(3.3V)

12VDC

PIC32-MAXI-WEB

Rev. A

COPYRIGHT( C) 2011, OLIMEX Lt d.

http://www.olime x.com/dev

+

+

+

+

+

+

+

+

+

+

+

+

+

+

+

VDD

VSSOUT

E/D

RJ45 SIDE

1:1

1:1

GND

0R 0R

0R 0R

0R

0R

0R

0R

10k

47k

10k

47k

10k

47k

USB

DEBUG INTERFACE:

POWER SUPPLY

RS232

USER LEDS

RESET CIRCUIT

CUT!!!

NC

NC

USER BUTTONS

TRIMMER

USB_OTG

TFT-LCD

CAN

LAN UEXT1

UEXT2

SD/MMCACCELEROMETER

RELAYS

DIGITAL INs

3.2 PHYSICAL DIMENSIONS

Note that all dimensions are in millimeters.

Page 12 of 22

4. CONTROL CIRCUITRY

4.1 POWER SUPPLY CIRCUIT

PIC32-MAXI-WEB can be power only from power connector PWR_JACK, where only 12 VDC
external voltage source has to be applied.

The board power consumption is about 300mA with all peripherals and MCU running at full speed,
relays and LEDs on and established Ethernet connection.

4.2 RESET CIRCUIT

PIC32-MAXI-WEB reset circuit is made of D4 (1N4148), RC group R55 – 10k and C31 – 100nF.
Serial resistor R56 – 330Ω is used to prevent fast C31 charge and discharge when
PIC32MX795F512L is being programmed.

Manual reset is possible by the RESET button.

4.3 CLOCK CIRCUIT

Quartz crystal Q1 8MHz is connected to PIC32MX795F512L pins 63 (OSC1/CLKI/RC12) and 64
(OSC2/CLKO/RC15).

Quartz crystal Q2 32.768 KHz is connected to PIC32MX795F512L pins 73 (SOSCI/CN1/RC13)
and 74 (SOSCO/T1CK/CN0/RC14).

Page 13 of 22

5. JUMPERS, CONNECTORS AND INTERFACES

In this chapter you will find the description of the jumpers and what signals might be found on the
different connectors.

5.1 JUMPER DESCRIPTION

3.3V_E - Enables 3.3V supply for PIC32MX795F512L and all other devices.
Default state closed (shorted).

3.3VA_E - Enables 3.3V positive supply for analog modules.
Default state is closed (shorted).

VDD_E - Enables PIC32MX795F512L's 3.3V power supply.
Default state is closed (shorted).

AGND_E - Enables the analog ground.
Default state is closed (shorted).

CAN1_T - This jumper assures correct work of the CAN1. At each end of the bus it should

be closed. This means that if you have only two devices with CAN, the jumpers of both
devices should be closed. If you have more than two devices, only the two end devices should be
closed.
Default state is closed (shorted).

CAN1_D - CAN Disable. If this jumper is closed, the CAN1 is disabled.

Default state is open (not shorted).

CAN2_T - This jumper assures correct work of the CAN2. At each end of the bus it should

be closed. This means that if you have only two devices with CAN, the jumpers of both
devices should be closed. If you have more than two devices, only the two end devices should be
closed.
Default state is closed (shorted).

CAN2_D - CAN Disable. If this jumper is closed, the CAN2 is disabled.

Default state is open (not shorted).

5.2 INPUT/OUTPUT

User button with name BUT1 – connected to PIC32MX795F512L pin 83
(ETXEN/PMD14/CN15/RD6).

User button with name BUT2 – connected to PIC32MX795F512L pin 84
(ETXCLK/PMD15/CN16/RD7).

User button with name BUT3 – connected to PIC32MX795F512L pin 80
(ETXD3/PMD13/CN19/RD13).

Reset button with name RESET – connected to PIC32MX460F512L pin 13 (#MCLR).

Page 14 of 22

One analog trimmer with name AN_TR – connected to PIC32MX795F512L pin 32
(AN8/C1OUT/RB8).

Status Led (yellow) with name LED1 – connected to PIC32MX795F512L pin 34
(AN10/CVREFOUT/PMA13/RB10).

Status Led (green) with name LED2 – connected to PIC32MX795F512L pin 76 (OC2/RD1).
Status Led (red) with name LED3 – connected to PIC32MX795F512L pin 77 (OC3/RD2).

Two opto-isolated digital inputs IN1 and IN2.

Two red LEDs – LED_IN1 and LED_IN2 for every digital input.

Two red LEDs – LED_R1, LED_R2 – for the relays.

Power supply red LED with name PWR – indicates that 3.3V power supply is available.

TFT LCD Display - FS-K320QVB-V1

5.3 EXTERNAL CONNECTOR DESCRIPTION

5.3.1 PWR_JACK

The power jack is used to power the board. Exactly 12V of voltage should be provided. The current
required depends on the peripherals used but generally your source should be capable to provide at
least 350mA.

The power jack is like the ones we use on all Olimex boards → YDJ-1134 (2mm in diameter front
hole).

If your power adapter doesn't have
the same jack you would need to
adapt it. Make sure that you
carefully follow the pin assignment.

Pin # Signal name

1 Power input
2 GND

5.3.2 ICSP CONNECTOR

The ICSP connector is used for serial programming. It is the place where most common PIC32­compatible programmers and debuggers are connected. The pins have 0.1'' step. If your
programmer/debugger has only the smaller 0.05'' connector you might need an adapter or you
should use jumper wires.

Page 15 of 22

Pin # Signal name

1 RSTN
2 3.3V
3 GND
4 PGED2
5 PGEC2
6 NC

PGED2 conducts I/O operations for the “Program Data” signal. Serial data for programming.
PGEC2 serves only as input for the “Program Clock” signal. Clock used for transferring the serial

data (output from ICSP, input for the MCU).

5.3.3 RS232/UART

Pin # Signal name

1 PC_CD
2 PC_RXD
3 PC_TXD
4 NC
5 GND
6 NC
7 PC_RTS
8 PC_CTS
9 NC

TXD is an output. It is the “Transmit Data” signal which is the asynchronous serial data output
(RS232) for the shift register on the UART controller.
RXD is an input. It is the “Receive Data” signal which is the asynchronous serial data input
(RS232) for the shift register on the UART controller.

The demo software uses RS232 so it would display your IP address on a PC terminal program (at
115200 baud) when the board is connected to a PC and has a valid Ethernet source connected.

5.3.4 USB_OTG

Pin # Signal name

1 +5V_VBUS
2 USB_D­3 USB_D+
4 USBID
5 GND

Page 16 of 22

5.3.5 ETHERNET

Pin # Signal name(chip side) Pin # Signal name(chip side)

1 TX+ 5 Not Connected (NC)
2 TX- 6 Not Connected (NC)
3 VCC/2 (2.5V) 7 RX+
4 Not Connected (NC) 8 RX-

LED Color Usage

Left Yellow 100MBits/s (Half/Full duplex)

Right Green Activity

5.3.6 CAN1 AND CAN2

Controller Area Network(CAN) is a standard designed to allow microcontrollers and devices to
communicate with each other within a vehicle without a host computer. Both CAN1 and CAN2
connectors follow the same layout.

Pin # Signal

1 GND
2 CANL
3 CANH

5.3.7 JTAG

The microcontroller has EJTAG support. The EJTAG signals are provided on the 14-pin JTAG
connector.

Pin # Signal name Pin # Signal name

1 NC 8 GND
2 GND 9 TCK
3 TDI 10 GND
4 GND 11 RSTN
5 TDO 12 CUT
6 GND 13 NC
7 TMS 14 3.3v

Page 17 of 22

5.3.8 UEXT1

The 10-pin UEXT connectors are typically mounted on Olimex boards. They pack three common
interfaces in a single connector – UART, I2C and SPI. You can use the UEXT connector to access
this interfaces easier (via jumper wires, for example).

You can also connect expansion modules to the UEXT connectors. More on UEXT might be found
here: https://www.olimex.com/Products/Modules/UEXT/

Pin # Signal name

1 3.3 V
2 GND
3 TXD1
4 RXD1
5 SCL1
6 SDA1
7 MISO1
8 MOSI1
9 SCK1
10 UEXT1_CS

5.3.9 UEXT2

UEXT2 features other UART, I2C and SPI signals. However there is multiplexing on some of the
lines which might cause problems if you are trying to use the line on both places.

The I2C data lines (SCL2, SDA2) are used for the built-in the board accelerometer. The SPI clock
signal AC1TX/SCK3A is used by the SD card connector.

Pin # Signal name

1 3.3 V
2 GND
3 U2TX
4 U2RX
5 SCL2
6 SDA2
7 MISO3A
8 MOSI3A
9 AC1TX/SCK3A
10 UEXT2_CS

Page 18 of 22

5.3.10 MICROSD CARD

Pin # Signal name

1 MCIDAT2
2 CS_MMC
3 MOSI3A
4 VDD (3.3 V)
5 AC1TX/SCK3A
6 GND
7 MISO3A
8 MCIDAT1
9 Not Connected
10 Not Connected
11 Not Connected
12 Not Connected

Page 19 of 22

6. AVAILABLE DEMO SOFTWARE

To compile the demo you would need the following tools: MPLAB IDE v8.91 or MPLABX 1.80,
Compiler: XC32 v1.21.

The demo demonstrates the functionality of the various peripherals of the board including user
input, serial communication,

Graphical User Interface (GUI) and Network connectivity
The demo is built upon the Microchip Solutions library (released on 22 august 2012)

including freely distributed support libraries:

- Microchip Graphics Library v3.06

- Microchip TCP/IP Stack Library v5.42

- Microchip MDD File System Library 1.4.0 (FAT, FAT32 file systems)

- Microchip USB support source files

FreeRTOS was used to make all tasks run virtually simultaneously. FreeRTOS is a freely
distributed RTOS with excellent support and online documentation. Version used is v7.3.0. MPLAB
has support for FreeRTOS (Tools/RTOS viewer).

You could find demo software for PIC32-MAXI-WEB board at the board's web page. It is
recommended to refer to the “README.txt” file inside the demo archive.

Direct link to PIC32-MAXI-WEB's web-page:

https://www.olimex.com/Products/PIC/Development/PIC32-MAXI-WEB/

Page 20 of 22

7. REVISION AND ORDERING INFORMATION

PIC32-MAXI-WEB – fully assembled and tested

How to purchase?

You can purchase directly from our online shop or from any of our distributors. Note that usually it
is faster and cheaper to purchase Olimex products from our distributors. List of confirmed Olimex
LTD distributors and resellers: https://www.olimex.com/Distributors.

Please visit https://www.olimex.com/ for more info.

7.1 DOCUMENT REVISION

Revision, date Changes Modified page

A, 30.08.13 Initial manual release All

B, 03.12.13 Document remake All

7.2 BOARD REVISION

Remember to check the schematics and the board design files to compare the differences.

Revision Notable changes

A Initial release of the board

Page 21 of 22

8. WARRANTY AND SUPPORT

For product support, hardware information and error reports mail to: [e-mail]. All
document or hardware feedback is welcome. Note that we are primarily a hardware company and
our software support is limited. Please consider reading the paragraph below about the warranty of
Olimex products.

All goods are checked before they are sent out. In the unlikely event that goods are faulty,
they must be returned, to OLIMEX at the address listed on your order invoice.

OLIMEX will not accept goods that have clearly been used more than the amount needed to

evaluate their functionality.

If the goods are found to be in working condition, and the lack of functionality is a result of

lack of knowledge on the customers part, no refund will be made, but the goods will be returned

to the user at their expense.

All returns must be authorized by an RMA Number. Email [e-mail] for authorization

number before shipping back any merchandise. Please include your name, phone number and order

number in your email request.

Returns for any unaffected development board, programmer, tools, and cables permitted within 7

days from the date of receipt of merchandise. After such time, all sales are considered final.

Returns of incorrect ordered items are allowed subject to a 10% restocking fee. What is

unaffected? If you hooked it to power, you affected it. To be clear, this includes items that

have been soldered to, or have had their firmware changed. Because of the nature of the

products we deal with (prototyping electronic tools) we cannot allow returns of items that have

been programmed, powered up, or otherwise changed post shipment from our warehouse.

All returned merchandise must be in its original mint and clean condition. Returns on damaged,

scratched, programmed, burnt, or otherwise 'played with' merchandise will not be accepted.

All returns must include all the factory accessories which come with the item. This includes

any In-Circuit-Serial-Programming cables, anti-static packing, boxes, etc.

With your return, enclose your PO#. Also include a brief letter of explanation of why the

merchandise is being returned and state your request for either a refund or an exchange.

Include the authorization number on this letter, and on the outside of the shipping box.

Please note: It is your responsibility to ensure that returned goods reach us. Please use a

reliable form of shipping. If we do not receive your package we will not be held liable.

Shipping and handling charges are not refundable. We are not responsible for any shipping

charges of merchandise being returned to us or returning working items to you.

The full text might be found at https://www.olimex.com/wiki/GTC#Warranty for future reference.

Page 22 of 22