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Revision: November 7, 2012
1300 Henley Court | Pullman, WA 99163
(509) 334 6306 Voice and Fax
Doc: 502-229 page 1 of 7
Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners.
Overview
The chipKIT Pmod Shield-Uno is an
input/output expansion board for use with the
chipKIT Uno32™ and chipKIT uC32™. It
provides the additional circuitry and connectors
to allow Digilent peripheral modules (Pmods™)
to be used with the Uno32 and uC32.
The Pmod Shield-Uno has five 2x6 Digilent
Pmod connectors. It also provides access to
the I/O connectors available on the Uno32 as
well as connecting to the I2C bus supported by
the Uno32 and uC32.
The Pmod Shield-Uno has the same form
factor as the Uno32 and uC32 boards.
Features include:
five 2x6 Digilent Pmod connectors
one 6-pin header connector for SPI
one I2C daisy chain connector
4 user LEDs
Standard chipKIT Shield connectors
Functional Description
The Pmod Shield-Uno is designed to be used with the chipKIT Uno32 board. When used in
combination, the two boards provide the necessary supporting hardware and connectors to make use
of most Digilent PmodsTM. The rest of this document will only reference the Uno32, however, the
shield can also be used with the chipKIT uC32.
The Pmod Shield-Uno has the following connectors.
J1 & J3: Digital Signal Pass-Through Connectors
This connector provides most of the signals used by the Uno32 board to the Pmod Shield-Uno board.
The remaining signals are passed through the Pmod Shield-Uno.
J6: SPI #2 Connector
This connector provides access to the SPI signals MISO, MOSI, SCK, and SS.
chipKIT Pmod Shield-Uno Reference Manual
www.digilentinc.com page 2 of 7
Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners.
JA-JE: Digilent Pmod Connectors
These connectors provide access to the signals of the Uno32 in a form factor which readily allows
Digilent Pmods to be connected.
J2: I2C #1 Daisy Chain Connector
This is a 2x4 pin header connector that provides access to the I2C signals SDA and SCL as well as
power from the 3.3V power bus and ground. This can be used to extend the I2C bus off of the board
and to power external I2C devices. Digilent has cables and a selection of I2C peripheral modules that
can be accessed using this connector.
J4: Analog Signal Pass-Through Connector
This connector passes the analog input pins on the Uno32 through the Pmod Shield-Uno board.
J5: Power Pass-Through Connector
This connector passes the power connector from the Uno32 through the Pmod Shield-Uno board, and
powers the Pmod Shield-Uno from the Uno32.
I2C Busses and Connectors
The Inter-Integrated Circuit (I2C) Interface provides a medium speed (100K or 400K bps) synchronous
serial communications bus. The I2C interface provides master and slave operation using either 7 bit or
10 bit device addressing. Each device is given a unique address, and the protocol provides the ability
to address packets to a specific device or to broadcast packets to all devices on the bus. Refer to the
Microchip PIC32MX3XX data sheet and the PIC32 Family Reference Manual for detailed information
on configuring and using the I2C interface.
The PIC32MX320 microcontroller on the Uno32 provides for two independent I2C interfaces. The
Pmod Shield-Uno is designed to provide access to both of these interfaces I2C #1 (SCL1, SDA1) and
I2C #2 (SCL2, SDA2). I2C #1 is the bus accessed through the standard chipKIT Wire library.
Connector J2 provides access to I2C port #1 while access to I2C port #2 is available on several of the
connectors of the Pmod Shield-Uno.
Connector J2 can be used to extend the I2C busses off of the board to connect to external I2C
devices. This is a standard 2x4 pin header connector with 0.100” spaced pins. It provides access to
the I2C signals, SCL and SDA, plus VCC3V3 and ground. The VCC3V3 can be used to power
external I2C devices.
The I2C bus uses open collector drivers to allow multiple devices to drive the bus signals. This means
that pull-up resistors must be provided to supply the logic high state for the signals. The Pmod Shield-
Uno provides 2.2Kohm pull-up resistors on I2C #1.
Generally, only one set of pull-ups are used on the bus. Jumpers JP10 and JP11 can be used to
disable the on-board pull-ups on I2C #1 if a different value is needed or some other device on the bus
chipKIT Pmod Shield-Uno Reference Manual
www.digilentinc.com page 3 of 7
Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners.
is providing the pull-ups or if I2C #1 isn’t being used and the pull-ups are interfering with the use of the
pins. The on-board pull-ups are enabled by install shorting blocks on JP10 and JP11. Removing the
shorting blocks disables the pull-ups.
Digilent has several small I/O modules available that can be connected using the I2C connector.
These include a 3-axis accelerometer, 4-channel, 12-bit A/D converter, serial character LCD panel, 3-
axis gyroscope, real-time clock/calendar, and an I/O expander.
SPI Connector
The SPI connector pins are as follows: Pin 1 (MISO), Pin 3 (SCK), Pin 4 (MOSI), and Pin 5 (SS).
These signals also appear on connector J8 of the Uno32.
Jumpers JP5 and JP7 on the Uno32 are used to select whether the Uno32 operates as a Master
(transmit on MOSI, receive on MISO) or a Slave (transmit on MISO, receive on MOSI) device. The
shorting blocks on JP5 and JP7 are normally placed in the Master position for the Uno32 to function
as an SPI master. Also, jumper JP4 on the Uno32 is used to select PWM output (in RD4 position) or
the SPI SS function on Pin 5 (in RG9 position).
chipKIT Pmod Shield-Uno Reference Manual
www.digilentinc.com page 4 of 7
Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners.
Appendix: chipKIT Pmod Shield-Uno Pinout Tables
J1 Pins
Uno32
Pin #
PIC32
Pin #
Pin
Signal
8
44
J1-01
IC3/PMCS2/PMA15/INT3/RD10
34
53
J1-02
PMRD/CN14/RD5
9
51
J1-03
OC4/RD3
35
45
J1-04
IC4/PMCS1/PMA14/INT4/RD11
10
8
J1-05
SS2/PMA2/CN11/RG9
10
52
J1-05
PMWR/OC5/IC5/CN13/RD4
36
54
J1-06
CN15/RD6
11
6
J1-07 or
J1-09
SDO2/PMA3/CN10/RG8
37
55
J1-08
CN16/RD7
12
5
J1-09 or
J1-07
SDI2/PMA5/CN8/RG7
38
35
J1-10
U1RTS/BCLK1/SCK1/INT0/RF6
13
4
J1-11
SCK2/PMA5/CN8/RG6
39
31
J1-12
PMA9/U2RX/SDA2/CN17/RF4
40
32
J1-14
PMA8/U2TX/SCL2/CN18/RF5
42
16
J1-15
PGED1/PMA6/AN0/VREF+/CVREF+/CN2/RB0
41
15
J1-16
PGC1/AN1/VREF-/CVREF-/CN3/RB1
J3 Pins
Uno32
Pin #
PIC32
Pin #
Pin
Signal
0
34
J3-01
U1RX/SDI1/RF2
26
60
J3-02
PMD0/RE0
1
33
J3-03
U1TX/SDO1/RF3
27
61
J3-04
PMD1/RE1
2
42
J3-05
IC1/RTCC/INT1/RD8
28
62
J3-06
PMD2/RE2
3
46
J3-07
OC1/RD0
29
63
J3-08
PMD3/RE3
4
59
J3-09
RF1
30
64
J3-10
PMD4/RE4
5
49
J3-11
OC2/RD1
31
1
J3-12
PMD5/RE5
6
50
J3-13
OC3/RD2
32
2
J3-14
PMD6/RE6
7
43
J3-15
IC2/U1CTS/INT2/RD9
33
3
J3-16
PMD7/RE7
chipKIT Pmod Shield-Uno Reference Manual
www.digilentinc.com page 5 of 7
Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners.
JA Pins
Uno32
Pin #
PIC32
Pin #
Pin
Signal
Notes
26
60
JA-01
PMD0/RE0
27
61
JA-02
PMD1/RE1
28
62
JA-03
PMD2/RE2
29
63
JA-04
PMD3/RE3
JA-05
GND
JA-06
VCC 3V3 / 5V0
select with JPA
30
64
JA-07
PMD4/RE4
31
1
JA-08
PMD5/RE5
32
2
JA-09
PMD6/RE6
33
3
JA-10
PMD7/RE7
JA-11
GND
JA-12
VCC 3V3 / 5V0
select with JPA
JB Pins
Uno32
Pin #
PIC32
Pin #
Pin
Signal
Notes
7
43
JB-01
PMD0/RE0
1
33
JB-02
PMD1/RE1
0
34
JB-03
PMD2/RE2
38
35
JB-04
PMD3/RE3
JB-05
GND
JB-06
VCC 3V3 / 5V0
select with JPB
36
54
JB-07
PMD4/RE4
34
53
JB-08
PMD5/RE5
10
52
JB-09
PMD6/RE6
37
55
JB-10
PMD7/RE7
JB-11
GND
JB-12
VCC 3V3 / 5V0
select with JPB
J2 Pins (I2C)
Uno32
Pin #
PIC32
Pin #
Pin
Signal
Notes
37
J2-01
SCL1/RG2
37
J2-02
SCL1/RG2
36
J2-03
SDA1/RG3
36
J2-04
SDA1/RG3
J2-05
GND
J2-06
GND
J2-07
VDD
J2-08
VDD
chipKIT Pmod Shield-Uno Reference Manual
www.digilentinc.com page 6 of 7
Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners.
J4 Pins
Uno32
Pin #
PIC32
Pin #
Pin
Signal
Notes
A00/14
14
J4-01
C2IN-/AN2/SS1/CN4/RB2
A06/20
13
J4-02
C2IN+/AN3/CN5/RB3
A01/15
11
J4-03
C1IN-/AN4/CN6/RB4
A07/21
12
J4-04
C1IN+/AN5/CN7/RB5
A02/16
21
J4-05
U2CTS/C1OUT/AN8/RB8
A08/22
22
J4-06
PMA7/C2OUT/AN9/RB9
A03/17
23
J4-07
TMS/CVREFOUT/PMA13/AN10/RB10
A09/23
24
J4-08
TDO/PMA12/AN11/RB11
A04/18
27
J4-09
TCK/PMA11/AN12/RB12
selected by JP6
36
J4-09
SDA1/RG3
selected by JP6
A10/24
28
J4-10
TDI/PMA10/AN13/RB13
A05/19
29
J4-11
PMALH/PMA1/U2RTS/AN14/RB14
selected by JP8
37
J4-11
SCL1/RG2
selected by JP8
A11/25
30
J4-12
PMALL/PMA0/AN15/OCFB/CN12/RB15
JC Pins
Uno32
Pin #
PIC32
Pin #
Pin
Signal
Notes
10
8
JC-01
SS2/PMA2/CN11/RG9
selected by JP4
6
JC-02
MOSI
5
JC-03
MISO
13
4
JC-04
SCK2/PMA5/CN8/RG6
JC-05
GND
JC-06
VCC 3V3 / 5V0
select with JPC
2
42
JC-07
IC1/RTCC/INT1/RD8
A07/21
12
JC-08
C1IN+/AN5/CN7/RB5
A01/15
11
JC-09
C1IN-/AN4/CN6/RB4
A06/20
13
JC-10
C2IN+/AN3/CN5/RB3
JC-11
GND
JC-12
VCC 3V3 / 5V0
select with JPC
chipKIT Pmod Shield-Uno Reference Manual
www.digilentinc.com page 7 of 7
Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners.
JD Pins
Uno32
Pin #
PIC32
Pin #
Pin
Signal
Notes
A02/16
21
JD-01
U2CTS/C1OUT/AN8/RB8
40
32
JD-02
PMA8/U2TX/SCL2/CN18/RF5
39
31
JD-03
PMA9/U2RX/SDA2/CN17/RF4
A05/19
29
JD-04
PMALH/PMA1/U2RTS/AN14/RB14
JD-05
GND
JD-06
VCC 3V3 / 5V0
select with JPD
42
16
JD-07
PGED1/PMA6/AN0/VREF+/CVREF+/CN2/RB0
41
15
JD-08
PGC1/AN1/VREF-/CVREF-/CN3/RB1
3
46
JD-09
OC1/RD0
5
49
JD-10
OC2/RD1
JD-11
GND
JD-12
VCC 3V3 / 5V0
select with JPD
JE Pins
Uno32
Pin #
PIC32
Pin #
Pin
Signal
Notes
A00/14
14
JE-01
C2IN-/AN2/SS1/CN4/RB2
6
50
JE-02
OC3/RD2
8
44
JE-03
IC3/PMCS2/PMA15/INT3/RD10
A08/22
22
JE-04
PMA7/C2OUT/AN9/RB9
JE-05
GND
JE-06
VCC 3V3 / 5V0
select with JPD
A04/18
27
JE-07
TCK/PMA11/AN12/RB12
9
51
JE-08
OC4/RD3
35
45
JE-09
IC4/PMCS1/PMA14/INT4/RD11
A10/24
28
JE-10
TDI/PMA10/AN13/RB13
JE-11
GND
JE-12
VCC 3V3 / 5V0
select with JPD
J6 Pins (SPI)
Uno32
Pin #
PIC32
Pin #
Pin
Signal
Notes
5
5
JE-01
MISO
JE-02
Unconnected
13
4
JE-03
SCK2/PMA5/CN8/RG6
6
6
JE-04
MOSI
10
8
JE-05
SS2/PMA2/CN11/RG9
selected by JP4
JE-06
GND