OLIMEX PIC32-MAXI-WEB User manual

PIC32-MAXI-WEB
General purpose development board
USER S MANUAL
Document revision C, October 2015
Designed by OLIMEX Ltd, 2013
All boards produced by Olimex LTD are ROHS compliant

DISCL IMER
© 2015 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 W RR NTY FOR THE DESIGN M TERI LS ND THE COMPONENTS
USED TO CRE TE PIC32-M XI-WEB. THEY RE CONSIDERED SUIT BLE ONLY
FOR PIC32-M XI-WEB.
Page 2 of 22

Table of Contents
DISCLAIMER ............................................................................................................. 2
1. INTRODUCTION ................................................................................................... 4
1.1 BO RD FE TURES ............................................................................................................... 4
1.2 ELECTROST TIC W RNING: ............................................................................................ 4
1.3 BO RD USE REQUIREMENTS: ......................................................................................... 4
1.4 BO RD L YOUT ................................................................................................................... 5
2. MICROCONTROLLER DETAILS ...................................................................... 6
2.1 FE TURES .............................................................................................................................. 6
2.2 BLOCK DI GR M ................................................................................................................ 8
2.3 MEMORY M P ...................................................................................................................... 9
3 BOARD SCHEMATIC AND DIMENSIONS ...................................................... 10
3.1 SCHEM TIC ......................................................................................................................... 10
3.2 PHYSIC L 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 EXTERN L 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 BO RD 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 240×320 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 320×240 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 (140×100) mm (5 51×3 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
Page 6 of 22

lines
Hardware Real-Time Clock and Calendar (RTCC)
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
12VDC
DEBUG INTERFACE:
POWER SUPPLY
RS232
USER LEDS
RESET CIRCUIT
CUT!!!
NC
NC
USER BUTTONS
TRIMMER
USB_OTG
TFT-LCD
CAN
See LPC2378-ST _Rev.C
LAN UEXT1
UEXT2
SD/MMCACCELEROMETER
RELAYS
DIGITAL INs
3.3V
3.3VA
1 2
3.3VA_E
CLOSE
3.3V_E
CLOSE
AGND
1 2
AGND_E
CLOSE
AN_TR
10k
BUT1 BUT2 BUT3
C1
100nF
C2
100nF
C3
100nF
C4
100nF
C5
100nF
C6
100nF
C7 39pF
C8 39pF
C9 27pF
C10 27pF
C11
100nF
C12
10uF/6.3V/0805
C13 100nF
+
C14 10uF/6.3V/0805
C15 100nF
C16100nF
C20
10uF/6.3V/0805
C21
100nF C22
100nF
+
C23
10uF/6.3V/0805
C25
C26
100nF
C27
100nF
C28
47uF/6.3V/TANT
C29
100nF
C30
C31
100nF
C32
100nF
C33
100nF
C34
NA(100nF)
C35
NA(100nF)
C36
NA(100nF)
C37
100nF
C38
C39
C40
C41
C45
NA(10nF)
C46
4.7nF
C51
100nF
C52
10uF/6.3V/0805
C53
100nF
C54
100nF
C55
100nF
C56
100nF
C57
100nF
C58
2.2uF
C59
100nF
C60
100nF
C61
100nF
C62
100nF
C63
10uF/6.3V
C64
47uF/6.3V/TANT
1
2
3
CAN1
TB3-3.5mm
12
CAN1_D
OPEN
1
2
3
CAN2
TB3-3.5mm
12
CAN2_D
OPEN
VDD
VSSOUT
E/D
1
3
4
2
CD1
6NC2-50MHz
CTS
D1
1N4148
D2
1N4148
D3
1N5819(SS14)
D4
1N4148
D5
1N5819(SS14)
D6
1N5819(SS14)
D7
1N4148
D8
1N4148
FB1
FB0805/600R/200mA(201209-601)
FB2
FB0805/600R/200mA(201209-601)
FB4
FB0805/600R/200mA(201209-601)
FET1
IRLML6402
GND
1
2
3
4
5
6
ICSP
WF6S
TB2-3.5mm
IN1
1
2
TB2-3.5mm
IN2
1
2
1 2
3 4
5 6
7 8
9 10
11 12
13 14
JTAG
BH14S(PIN<12>-CUT\!)
L1
15uH/DBS135
L2
CL470nH/0805/1.76R/250mA
7575
7575
1nF/2kV
1:1
1:1
1
4
5
2
3
7
8
6
GREEN
YELLOW
AG AG
AY AY
COM 3
G G
Y Y
NC 6
RD+ 7
RD- 8
TD+ 1
TD- 2
LAN
RJLBC-060TC1
LED1 LED2 LED3
LED_IN1
GYX-SD-TC0805SUR (RED)
LED_IN2
GYX-SD-TC0805SUR (RED)
OPT1
H11A817SMD
1
2
4
3
OPT2
H11A817SMD
1
2
4
3
+5V
2.5V
+5V
+12V
+12V+12V
+5V
+5V
PWR
PWR_JAC
YDJ-1134
Q1
Q8.000MHz/20pF/HC-49SM(SMD)
GND
Q2
QCT32768(2x6)/6pF
R6
1.5 /1%
R7
4.99k/1%
R8 10k
R9
10k
R10 1k
R16 100k
R22 4.7k
R23 330R
R24 330R
R25 330R
R26 NA
R27 1k
R28 4.7k
0R
R29 0R(NA)
R30 NA
R31 NA
R32 NA
R33 4.7k
0R
R34 0R(NA)
R35 NA
R36 NA
R37 10k
0R
R38 0R(NA)
R39 NA
R40 4.7k
0R
R41 0R(NA)
R42 NA
R43 4.7k
R44 10k
R45 1M
R46 10k
R47 100k
R48 100k
R49 100k
R50 1k
0R
R51
0R(NA)
R52
1k
R53
1k
R54 330R
R55
10k
R56
330R
R57
NA
R58
NA
R59
NA
R60
100k
R61
100k
0R
R62
0R(NA)
R63
100k
R64
1k
R65
330R
R66
NA(100R)
R67
10k
R68
330R
R69
NA(100R)
R70
10k
R71
330R
R72
NA(100R)
R73
10k
R74
R75
R76
R77
4.99k/1%
R78
15k/1%
R79 4.99k/1%
R80
150k
R81
4.7k
R83
330R
R84
330R
R85
330R
R86
330R
R87
330R
R88
NA
R8910k
R9010k
0R
R91
0R(NA)
R9410k
R95
120R
0R
R96
0R(NA)
R99 10k
R100
120R
R101
4.7k
R102
330R
R103
330R
R104
4.7k
R105
330R
1
2
3
4
5
6
REL
HD-515R_6P
RAS-12-15
REL1
REL1
RAS-12-15
REL2
REL2
RESET
T1107A(6x3.8x2.5mm)
1
2
3
4
5
6
7
8
9
G1
G2
RS232
DB9-F
RTS
CD/DAT3/CS
2
CL /SCL
5
CMD/DI
3
DAT0/DO
7
DAT1/RES
8
DAT2/RES
1
VDD
4VSS
6
SD/MMC
MICRO
T1
DTC114Y A
10k T2
DTC114Y A
10k
T3
DTC114Y A
10k
TFT
FS- 320QVB-V1
#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
LED 1
30
LED 2
31
LED 3
32
LED 4
33
LED 5
34
RS
5
VCC
2
VCC
3
XL 27
XR 29
YD 26
YU 28
#MCLR
13
#SS1/IC2/RD9
69
AC1RX/#SS3A/U3BRX/U3ACTS/RF12
40 AC1TX/SC 3A/U3BTX/#U3ARTS/RF13
39
AERXD0/INT1/RE8
18 AERXD1/INT2/RE9
19
AERXERR/RG15
1
AETXCL /SCL1/INT3/RA14
66
AETXD0/#SS1A/U1BRX/#U1ACTS/CN20/RD14
47
AETXD1/SC 1A/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/SC 2A/U2BTX/#U2ARTS/PMA5/CN8/RG6
10 ECRS/SDA2A/SDI2A/U2ARX/PMA4/CN9/RG7
11
EMDC/IC4/PMCS1/PMA14/RD11
71
ERXCL /#SS2A/U2BRX/#U2ACTS/PMA2/CN11/RG9
14
ERXDV/SCL2A/SDO2A/U2ATX/PMA3/CN10/RG8
12
ETXCL /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/CL I/RC12
63
OSC2/CL O/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
100PMD5/RE5
3PMD6/RE6
4PMD7/RE7
5
PMRD/CN14/RD5
82
RTCC/EMDIO/IC1/RD8
68
SC 1/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/T1C /CN0/RC14
74
T2C /RC1
6
T3C /AC2TX/RC2
7
T4C /AC2RX/RC3
8
T5C /SDI1/RC4
9
TC /RA1
38
TDI/RA4
60
TDO/RA5
61
TMS/RA0
17
TRCL /RA6
91
TRD0/RG13
97
TRD1/RG12
96
TRD2/RG14
95
TRD3/RA7
92
USBID/RF3
51
VBUS
54
VCAP/VDDCORE
85
VDD
2VDD
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
PIC32MX795F512L-80I/PT
FXSD/FXEN
34
GND1 8
GND2 12
GND4
35
GND5
36
INT/PHYAD0
25
LED0/TEST
26
LED1/SPD100/NFEF
27
LED2/DUPLEX
28
LED3/NWAYEN
29
MDC 2
MDIO 1
PD#
30
RX+
33
RX-
32
RXC 10
RXD0/PHYAD4
6
RXD1/PHYAD3
5
RXD2/PHYAD2
4
RXD3/PHYAD1
3
RXDV/CRSDV/PCS_LPB
9
RXER/ISO
11
VDDIO1
7
VDDRX
31
U2
S8721BLMM
U3
SMB380,(QFN10)
CSB
5
GND
3
INT4
NC1
1
NC2
10
SC
6
SDI/SDA
8
SDO
7
VDD
2VDDIO
9
GND
VCCRESET
1 2
U4
NA(MCP130T)
C1+ 1
C1- 3
C2+ 4
C2- 5
R1IN
13 R1OUT 12
R2IN
8R2OUT 9
T1IN 11
T1OUT
14
T2IN 10
T2OUT
7
V+
2
V-
6
U5
ST3232(SO16)
GND VCC
15 16
U5PWR
#ENA
1
#ENB
4
FLAG_A
2
FLAG_B
3
GND
6
IN
7
OUT_A
8
OUT_B
5
U6
LM3526M-L(SO8)
CANH
7
CANL
6
RS
8
RXD
4
TXD
1
VDD
3
VREF
5
VSS
2
U7
MCP2551
CANH
7
CANL
6
RS
8
RXD
4
TXD
1
VDD
3
VREF
5
VSS
2
U8
MCP2551
BH10S
UEXT1
1 2
3 4
5 6
7 8
9 10
BH10S
UEXT2
1 2
3 4
5 6
7 8
9 10
D+
D-
GND
ID
VBUS
USB_OTG
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
VDD_E
CLOSE
VR1
BD9778HFP
EN/SYNC
7
FB 3
GND
4
INV5
RT
6SW 2
VIN
1
ADJ/GND
IN OUT
VR1(3.3V)
LM1117IMPX-ADJ
+5V_VBUS +5V_VBUS
+5V_VBUS
/TFT_CS
/TFT_CS
/TFT_RST
/TFT_RST
AC1RX
AC1RX
AC1RX
AC1TX/SC 3A
AC1TX/SC 3A
AC1TX/SC 3A
AC1TX/SC 3A
AC2RX
AC2RX
AC2TX
AC2TX
ACC_INT
ACC_INT
AERXD0
AERXD0
AERXD1
AERXD1
AERXERR
AERXERR
AETXD0
AETXD1
AETXEN
AETXEN
CS_MMC
CS_MMC
EMDC
EMDC
EMDIO
EMDIO
ERXDV
ERXDV
IN1
IN1
IN2
IN2
LED1
LED1
LED2
LED2
LED3
LED3
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_REFCL
PHY_REFCL
PHY_RSTN
PHY_RSTN
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
SC 1
SC 1
SCL1
SCL2
SCL2
SCL2
SDA1
SDA2
SDA2
SDA2
SW_SCL1
SW_SCL1
SW_SDA1
SW_SDA1
SW_U2RX
SW_U2RX
SW_U2TX
SW_U2TX
TC
TC
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

3.2 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)
3.3V _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)
GND_E – Enables the analog ground
Default state is closed (shorted)
C N1_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)
C N1_D – CAN Disable If this jumper is closed, the CAN1 is disabled
Default state is open (not shorted)
C N2_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)
C N2_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 PIC32-
compatible 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
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
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_D-
3 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- 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
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
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
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
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, the implementation of Graphical User Interface (GUI) and betwork
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