Digilent 410-229P User Manual

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Revision: November 7, 2012

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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.

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chipKIT Pmod Shield-Uno Reference Manual

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 Shield­Uno 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

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chipKIT Pmod Shield-Uno Reference Manual

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, 3­axis 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).

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chipKIT Pmod Shield-Uno Reference Manual

Uno32

Pin #

PIC32

Pin #

Pin

Signal

Notes

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

selected by JP4

10

52

J1-05

PMWR/OC5/IC5/CN13/RD4

selected by JP4

36

54

J1-06

CN15/RD6

11

6

J1-07 or

J1-09

SDO2/PMA3/CN10/RG8

selected by JP5/JP7

37

55

J1-08

CN16/RD7

12

5

J1-09 or

J1-07

SDI2/PMA5/CN8/RG7

selected by JP7/JP5

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

Uno32

Pin #

PIC32

Pin #

Pin

Signal

Notes

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

selected by JP4

28

62

J3-06

PMD2/RE2

selected by JP4

3

46

J3-07

OC1/RD0

29

63

J3-08

PMD3/RE3

selected by JP5/JP7

4

59

J3-09

RF1

30

64

J3-10

PMD4/RE4

selected by JP7/JP5

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

Appendix: chipKIT Pmod Shield-Uno Pinout Tables
J1 Pins

J3 Pins

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chipKIT Pmod Shield-Uno Reference Manual

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

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

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

JA Pins

JB Pins

J2 Pins (I2C)

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chipKIT Pmod Shield-Uno Reference Manual

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

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

J4 Pins

JC Pins

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chipKIT Pmod Shield-Uno Reference Manual

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

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

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

JD Pins

JE Pins

J6 Pins (SPI)

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