Atmel SAM3N-EK User guide

SAM3N-EK Development Board

....................................................................................................................

User Guide

11080C–ATARM–30-Mar-11

Section 1
Introduction.................................................................................................................			1-1
1.1	SAM3N Evaluation Kit........................................................................................................		1-1
1.2	User Guide.........................................................................................................................		1-1
1.3	References and Applicable Documents .............................................................................		1-1
Section 2
Kit Contents ................................................................................................................			2-1
2.1	Deliverables .......................................................................................................................		2-1
2.2	Electrostatic Warning .........................................................................................................		2-2
Section 3
Power Up	....................................................................................................................		3-1
3.1	Power up the Board ...........................................................................................................		3-1
3.2	DevStart	.............................................................................................................................	3-1
3.3	Recovery Procedure ..........................................................................................................		3-1
3.4	Sample Code and Technical Support ................................................................................		3-1
Section 4
Evaluation Kit Hardware .............................................................................................			4-1
4.1	Board Overview..................................................................................................................		4-1
4.2	Features List ......................................................................................................................		4-2
4.3	Function Blocks..................................................................................................................		4-2
	4.3.1	Processor.............................................................................................................	4-2
	4.3.2	Memory................................................................................................................	4-2
	4.3.3	Clock Circuitry......................................................................................................	4-3
	4.3.4	Reset Circuitry .....................................................................................................	4-3
	4.3.5	Power Supply and Management..........................................................................	4-4
	4.3.6	UART ...................................................................................................................	4-4
	4.3.7	Display Interface ..................................................................................................	4-5
	4.3.8	Backlight Control..................................................................................................	4-5
	4.3.9	JTAG/ICE.............................................................................................................	4-6
	4.3.10	PWM Buzzer........................................................................................................	4-6
	4.3.11	SD/MMC Card .....................................................................................................	4-6
	4.3.12	Touch Elements..................................................................................................	4-7
	4.3.13	User Buttons ........................................................................................................	4-7
	4.3.14	LEDs ....................................................................................................................	4-8
	4.3.15	ZigBee .................................................................................................................	4-8
	4.3.16	PIO Expansion.....................................................................................................	4-8
4.4	Configuration......................................................................................................................		4-9
	4.4.1	PIO Usage ...........................................................................................................	4-9

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4.4.2	Jumpers .............................................................................................................	4-12
4.4.3	Test Points.........................................................................................................	4-12
4.4.4 Assigned PIO Lines, Disconnection Possibility..................................................		4-13

Section 5
QT600.........................................................................................................................			5-1
5.1	Overview ............................................................................................................................		5-1
5.2	System Description ............................................................................................................		5-2
5.3	Features	.............................................................................................................................	5-2
5.4	Getting Started...................................................................................................................		5-3
5.5	Hardware Description.........................................................................................................		5-5
	5.5.1	QT600 Interface Board ........................................................................................	5-5
	5.5.2	TOUCH DATA Connectors ..................................................................................	5-7
	5.5.3	Target Voltage VTG.............................................................................................	5-8
	5.5.4	VTG LED .............................................................................................................	5-8
	5.5.5	TOUCH DATA LED .............................................................................................	5-8
	5.5.6	STATUS LED.......................................................................................................	5-9
	5.5.7	Touch ATx Firmware ...........................................................................................	5-9
5.6	Touch Debug......................................................................................................................		5-9
5.7	Using QT600 and AVR QTouch Studio for Custom Applications.......................................		5-9
5.8	Troubleshooting and Support...........................................................................................		5-10
	5.8.1	Technical Support..............................................................................................	5-10
	5.8.2	Force Firmware Upgrade...................................................................................	5-10
Section 6
Schematics .................................................................................................................			6-1
6.1	Schematics.........................................................................................................................		6-1
Section 7
Troubleshooting..........................................................................................................			7-1
7.1	Self-Test.............................................................................................................................		7-1
7.2	Board Recovery .................................................................................................................		7-1
Section 8
Revision History..........................................................................................................			8-1
8.1	Revision History .................................................................................................................		8-1

SAM3N-EK Development Board User Guide

11080C–ATARM–30-Mar-11

Section 1

Introduction

1.1SAM3N Evaluation Kit

The SAM3N Evaluation Kit (SAM3N-EK) allows the evaluation of the SAM3N series devices. It has enough features to demonstrate most of the product's capabilities to the users. The SAM3N-EK also features extension connectors to allow the users to add new interfaces in case they are not on-board.

1.2User Guide

This guide focuses on the SAM3N-EK board as an evaluation platform. It is made up of 6 sections:

Section 1 includes references, applicable documents, acronyms and abbreviations.

Section 2 summarizes the kit contents.

Section 3 provides instructions to power up the SAM3N-EK and describes how to use it.

Section 4 describes the SAM3N-EK board design in more detail.

Section 5 provides schematics.

Section 6 describes the troubleshooting.

1.3References and Applicable Documents

Table 1-1. References and Applicable Documents

Title	Comment
SAM3N Datasheet	http://atmel.com/dyn/products/devices.asp?family_id=605#2245

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Section 2

Kit Contents

2.1Deliverables

The Atmel® SAM3N Evaluation Kit contains the following items:

a SAM3N-EK board

a universal input AC/DC power supply with US, Europe and UK plug adapters

one serial RS232 cable

a welcome letter

Figure 2-1. Unpacked SAM3N-EK

Unpack and inspect the kit carefully. Contact your local Atmel distributor, should you have issues concerning the contents of the kit.

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Kit Contents

2.2Electrostatic Warning

The SAM3N-EK board must not be subjected to high electrostatic potentials. A grounding strap or similar protective device should be worn when handling the board. Avoid touching the components or any other metallic element of the board.

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Section 3

Power Up

3.1Power up the Board

Unpack the board taking care to avoid electrostatic discharge. Unpack the power supply, select the right power plug adapter corresponding to that of your country, and insert it in the power supply.

Connect the power supply DC connector to the board and plug the power supply to an AC power plug. The board LCD should light up and run a Touch demo (shows a screen animation that matches the Touch devices operated on the PCB).

3.2DevStart

The CDROM provided in the kit contains what we call a "DevStart" a.k.a. "Development Start". This bundle guides you through the first steps of building and running a software application on the SAM3N-EK.

If the CD does not auto-play on your PC, just open it through the explorer and click the file welcome.html to get started.

The SAM3N-EK DevStart guides you through the installation processes of IAR™ EWARM, Keil MDK and GNU toolkits. Then, it gives you step-by-step instructions on how to rebuild a single example project and how to program it into the SAM3N-EK. Optionally, if you have a SAM-ICE™, instructions are also given about how to debug the code.

3.3Recovery Procedure

The DevStart ends by giving step-by-step instructions on how to recover the SAM3N-EK to the state as it was when shipped by Atmel.

SAM3N-EK Test Software, Chapter 3.1 "Flash Recovery" gives instructions if you deleted the contents of the embedded Flash or the DataFlash® and want to recover from this situation.

3.4Sample Code and Technical Support

After boot up, you can run some sample code or your own application on the development kit. You can download sample code and get technical support from Atmel website (http://support.atmel.no/bin/customer).

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11080C–ATARM–30-Mar-11

Section 4

Evaluation Kit Hardware

4.1Board Overview

This section introduces the Atmel SAM3N Evaluation Kit design. It introduces system-level concepts, such as power distribution, memory, and interface assignments.

The SAM3N-EK board is based on the integration of an ARM® Cortex®-M3 processor with on-board Flash and a set of popular peripherals. It is designed to provide a high performance processor evaluation solution with high flexibility for various kinds of applications.

Figure 4-1. SAM3N-EK Block Diagram

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Evaluation Kit Hardware

4.2Features List

Here is the list of the main board components and interfaces:

SAM3N4C QFP chip with optional socket footprint

12 MHz crystal

32.768 KHz crystal

32-Megabit Serial DataFlash

2.0 inch TFT color LCD display with backlight

UART port with level shifter IC

Micro SD interface

Reset buttons: NRST

User buttons: Left and Right

QTouch® buttons: Left, Right, and Slider

JTAG port

On-board power regulation

Two user LEDs

Power LED

ZigBee® connector

2x32 bit PIO connection interfaces (PIOA, PIOC) and 1x15 bit PIO connection interface (PIOB)

4.3Function Blocks

4.3.1Processor

The SAM3N-EK is equipped with a SAM3N4C device in LQFP100 package.

4.3.2Memory

The SAM3N4 chip embeds:

256 Kbytes of embedded Flash

24 Kbytes of embedded SRAM with dual bank

16 Kbytes of ROM with embedded BootLoader routines (UART) and In-Application Programming functions (IAP) routines.

The SAM3N-EK features an external DataFlash through SPI bus

Figure 4-2. DataFlash

			+3V3
			R27		MN7
					AT25DF321	+3V3
			47K
NPCS_DATAFLASH	PA22			1		8
SPI CLK	PA14	R28	0R	6	NCS	VCC
SPI MOSI	PA13			5	SCK
					SI
SPI MISO	PA12	R29	10R	2		C35
					SO	100nF
	+3V3
		R31	0R	3		4
					NWP
		R32	0R	7		GND
					NHOLD
						DGND

DATA FLASH

NPCS3 chip select signal is used for DataFlash chip selection.

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Evaluation Kit Hardware

4.3.3Clock Circuitry

The clock generator of a SAM3N microcontroller is made up of:

A Low Power 32,768 Hz Slow Clock Oscillator with bypass mode

A Low Power RC Oscillator

A 3 to 20 MHz Crystal Oscillator, which can be bypassed

A factory programmed fast internal RC Oscillator. 3 output frequencies can be selected: 4 (default value), 8 or 12 MHz.

A 60 to 130 MHz programmable PLL (input from 3.5 to 20 MHz), capable to provide the clock MCK to the processor and to the peripherals.

The SAM3N-EK board is equipped with one 12 MHz crystal, and one 32.768 Hz crystal. An optional 12 MHz Piezoelectric Ceramic Resonator can be mounted in place of the 12 MHz crystal (for low cost clocking option evaluation).

Figure 4-3.

SAM3N MCU

PC[0..31]

<![if ! IE]> <![endif]>PC0 PC1 PC2 PC3 PC4 PC5

<![if ! IE]> <![endif]>PC6

<![if ! IE]> <![endif]>PC7

<![if ! IE]> <![endif]>PC8

<![if ! IE]> <![endif]>PC9

<![if ! IE]> <![endif]>PC10

<![if ! IE]> <![endif]>PC11

<![if ! IE]> <![endif]>PC12

<![if ! IE]> <![endif]>PC13

<![if ! IE]> <![endif]>PC14

<![if ! IE]> <![endif]>PC15

<![if ! IE]> <![endif]>PC16

<![if ! IE]> <![endif]>PC17

<![if ! IE]> <![endif]>PC18

<![if ! IE]> <![endif]>PC19

<![if ! IE]> <![endif]>PC20

<![if ! IE]> <![endif]>PC21

<![if ! IE]> <![endif]>PC22

<![if ! IE]> <![endif]>PC23

<![if ! IE]> <![endif]>PC24

<![if ! IE]> <![endif]>PC25

<![if ! IE]> <![endif]>PC26

<![if ! IE]> <![endif]>PC27

<![if ! IE]> <![endif]>PC28

<![if ! IE]> <![endif]>PC29

<![if ! IE]> <![endif]>PC30

<![if ! IE]> <![endif]>PC31

MN1

SAM3N4C-AU

<![if ! IE]> <![endif]>25

<![if ! IE]> <![endif]>47

<![if ! IE]> <![endif]>43

<![if ! IE]> <![endif]>40 37

<![if ! IE]> <![endif]>35

<![if ! IE]> <![endif]>32

<![if ! IE]> <![endif]>29

<![if ! IE]> <![endif]>58 62

<![if ! IE]> <![endif]>65

<![if ! IE]> <![endif]>68

<![if ! IE]> <![endif]>23

<![if ! IE]> <![endif]>21 71

<![if ! IE]> <![endif]>19

<![if ! IE]> <![endif]>73

<![if ! IE]> <![endif]>75

<![if ! IE]> <![endif]>78 80

<![if ! IE]> <![endif]>82

<![if ! IE]> <![endif]>84

<![if ! IE]> <![endif]>86

<![if ! IE]> <![endif]>90 92

<![if ! IE]> <![endif]>94

<![if ! IE]> <![endif]>13

<![if ! IE]> <![endif]>17

<![if ! IE]> <![endif]>54 4

<![if ! IE]> <![endif]>6

<![if ! IE]> <![endif]>8

<![if ! IE]> <![endif]>2 1

R1

DNP

<![if ! IE]> <![endif]>PC0

<![if ! IE]> <![endif]>PC1

<![if ! IE]> <![endif]>PC2 PC3

<![if ! IE]> <![endif]>PC4 NPCS1

<![if ! IE]> <![endif]>PC5

<![if ! IE]> <![endif]>PC6

<![if ! IE]> <![endif]>PC7 NPCS2

<![if ! IE]> <![endif]>PC8 PWM0

<![if ! IE]> <![endif]>PC9 PWM1

<![if ! IE]> <![endif]>PC10PWM2

<![if ! IE]> <![endif]>PC11PWM3

<![if ! IE]> <![endif]>PC12 AD12

<![if ! IE]> <![endif]>PC13 AD10

<![if ! IE]> <![endif]>PC14 PCK2

<![if ! IE]> <![endif]>PC15 AD11

<![if ! IE]> <![endif]>PC16 PCK0

<![if ! IE]> <![endif]>PC17 PCK1

<![if ! IE]> <![endif]>PC18PWM0

<![if ! IE]> <![endif]>PC19PWM1

<![if ! IE]> <![endif]>PC20PWM2

<![if ! IE]> <![endif]>PC21PWM3

<![if ! IE]> <![endif]>PC22PWM0

<![if ! IE]> <![endif]>PC23TIOA3

<![if ! IE]> <![endif]>PC24TIOB3

<![if ! IE]> <![endif]>PC25TCLK3

<![if ! IE]> <![endif]>PC26TIOA4

<![if ! IE]> <![endif]>PC27TIOB4

<![if ! IE]> <![endif]>PC28TCLK4

<![if ! IE]> <![endif]>TIOA5PC29 AD13

<![if ! IE]> <![endif]>TIOB5PC30 AD14

<![if ! IE]> <![endif]>TCLK5PC31 AD15

DGND

R7

DNP

15pF

R2

0R

XIN

97

PA4_TWCK0_TCLK0

53

C1

PB9_XIN

74

3

Y1

Y2

12MHz

PA0_PWM0_TIOA0

72

DNP

PA1_PWM1_TIOB0

67

DGND

R3

0R

XOUT

96

PA2_PWM2_SCK0_DATRG

66

PB8_XOUT

PA3_TWD0_NPCS3

C2

15pF

55

PA5_RXD0_NPCS3

52

PA6_TXD0_PCKO

49

XIN32

R9

PA7_RTS0_PWM3

48

XOUT32

R4

PA8_CTS0_ADTRG

C3

R5

46

PA9_URXD0_NPCS1

7pF

44

0R

PA10_UTXD0_NPCS2

XIN32

42

PA11_NPCS0_PWM0

41

<![if ! IE]> <![endif]>1

<![if ! IE]> <![endif]>2

PA12_MISO_PWM1

33

PB2

7

PA13_MOSI_PWM2

31

Y3

PB2_URXD1_NPCS2_AD6

PA14_SPCK_PWM3

30

32.768KHz

PB3

9

PA15_TIOA1

28

<![if ! IE]> <![endif]>4

<![if ! IE]> <![endif]>3

PB3_UTXD1_PCK2_AD7

PA16_TIOB1

12

DGND

PA17_PCK1_AD0

14

PA18_PCK2_AD1

XOUT32

18

PB10

88

PB10_DDM

SAM3N - LQFP100

PA19_AD2

24

7pF

0R

PA21_RXD1_PCK1_AD8

PB11

89

20

C4

R10

PA20_AD3

15

PB11_DDP

PA22_TXD1_NPCS3_AD9

22

PA23_SCK1_PWM0

34

JP1

PA24_RTS1_PWM1

38

PA25_CTS1_PWM2

+3V3

DNP

39

JTAGSEL

77

JTAGSEL

PA26_TIOA2

57

PA27_TIOB2

59

PB4

51

PA28_TCLK1

63

PB6

79

PB4_TWD1_PWM2_TDI

PA29_TCLK2

64

PB7

83

PB6_TMS_SWDIO

PA30_NPCS2

81

PB5

76 PB7_TCK_SWCLK

PA31_NPCS1_PCK2

PB5_TWCK1_TDO_TACESWO

NRST

NRST

60

NRST

ADVREF

1

ADVREF

PB0

3

93

PB1

5 PB0_PWM0_AD4

PB13_PCK0_DAC0

PB13

JP3

PB1_PWM1_AD5

+3V3

99

PB14

PB12

87

PB14_NPCS1_PWM3

PB12_ERASE

<![if ! IE]> <![endif]>VDDCORE

<![if ! IE]> <![endif]>VDDCORE

<![if ! IE]> <![endif]>VDDCORE

<![if ! IE]> <![endif]>VDDCORE

<![if ! IE]> <![endif]>VDDIN

<![if ! IE]> <![endif]>VDDOUT

<![if ! IE]> <![endif]>VDDPLL

<![if ! IE]> <![endif]>GND

<![if ! IE]> <![endif]>GND

<![if ! IE]> <![endif]>GND

<![if ! IE]> <![endif]>GND

<![if ! IE]> <![endif]>GND

<![if ! IE]> <![endif]>VDDIO

<![if ! IE]> <![endif]>VDDIO

<![if ! IE]> <![endif]>VDDIO

<![if ! IE]> <![endif]>VDDIO

<![if ! IE]> <![endif]>VDDIO

61

TEST

VDDOUT

<![if ! IE]> <![endif]>10

<![if ! IE]> <![endif]>11

<![if ! IE]> <![endif]>16

<![if ! IE]> <![endif]>36

<![if ! IE]> <![endif]>56

<![if ! IE]> <![endif]>85

<![if ! IE]> <![endif]>100

<![if ! IE]> <![endif]>26

<![if ! IE]> <![endif]>45

<![if ! IE]> <![endif]>70

<![if ! IE]> <![endif]>95

<![if ! IE]> <![endif]>2

<![if ! IE]> <![endif]>27

<![if ! IE]> <![endif]>50

<![if ! IE]> <![endif]>69

<![if ! IE]> <![endif]>91

<![if ! IE]> <![endif]>98

VDDIN

VDDIO

<![if ! IE]> <![endif]>100nF

<![if ! IE]> <![endif]>100nF

<![if ! IE]> <![endif]>2.2uF

<![if ! IE]> <![endif]>100nF

<![if ! IE]> <![endif]>100nF

<![if ! IE]> <![endif]>100nF

<![if ! IE]> <![endif]>100nF

<![if ! IE]> <![endif]>DNP

<![if ! IE]> <![endif]>100nF

DGND

<![if ! IE]> <![endif]>100nF

<![if ! IE]> <![endif]>100nF

<![if ! IE]> <![endif]>100nF

<![if ! IE]> <![endif]>100nF

<![if ! IE]> <![endif]>100nF

<![if ! IE]> <![endif]>4.7uF

<![if ! IE]> <![endif]>4.7uF

<![if ! IE]> <![endif]>C7

<![if ! IE]> <![endif]>C8

<![if ! IE]> <![endif]>C9

<![if ! IE]> <![endif]>C10

<![if ! IE]> <![endif]>C11

<![if ! IE]> <![endif]>C12

<![if ! IE]> <![endif]>C13

<![if ! IE]> <![endif]>C14

<![if ! IE]> <![endif]>C15

<![if ! IE]> <![endif]>C16

<![if ! IE]> <![endif]>C17

<![if ! IE]> <![endif]>C18

<![if ! IE]> <![endif]>C19

<![if ! IE]> <![endif]>C20

<![if ! IE]> <![endif]>C21

<![if ! IE]> <![endif]>C22

VDDCORE

DGND

DGND

VDDPLL

DGND

		PA[0..31]
	PA0
	PA1
	PA2
	PA3
	PA4
	PA5
	PA6
DNP	PA7
DNP	PA8
	PA9
	PA10
	PA11
	PA12
	PA13
	PA14
	PA15
	PA16
	PA17
	PA18
	PA19
	PA20
	PA21
	PA22
	PA23
	PA24
	PA25
	PA26
	PA27
	PA28
	PA29
	PA30
	PA31	+3V3
	JP2
	C5
	100nF
	DGND
		PB[0..14]
	PB0
	PB1
	PB2
	PB3
	PB4
	PB5
	PB6
	PB7
	PB10
	PB11
	PB12
	PB13
	PB14

4.3.4Reset Circuitry

The on-board NRST button BP1 provides the SAM3N4C with external reset control.

Two User buttons BP2 and BP3, can be used to wake up the chip from low power modes.

The NRST pin is bidirectional. It is handled by the on-chip reset controller. It can be driven low to provide a reset signal out to the external components. Conversely, it can be asserted low from the outside to reset the microcontroller, its core and peripherals, with exception of the backup region (RTC, RTT and

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Supply Controller). The NRST pin integrates a permanent pull-up resistor of about 100 kOhm to VDDIO. On the SAM3N-EK board, the NRST signal is connected to the JTAG port.

4.3.5Power Supply and Management

The SAM3N-EK board is supplied with an external 5V DC block through the J1 socket. It is protected by a PolyZen diode MN3. The PolyZen protects the board in the case of an incorrect power supply connection.

The LDO regulator MN4 is used for the 3.3V main supply. It powers all the 3.3V components on the board.

Figure 4-4. Power Block

J1		MN3	+5V		MN4
MP179P 2.1mm		ZEN056V130A24LS			LP38692MP-3.3
1	1	3			4		3
2					VIN		VOUT
<![if ! IE]> <![endif]>3		<![if ! IE]> <![endif]>2			VEN	<![if ! IE]> <![endif]>GND	NC
		C27	+ C28	C29	1		2
		100nF	22uF	10uF 0805		<![if ! IE]> <![endif]>5

	+3V3
C25	C26
1uF	10uF 0805

DGND

The SAM3N4/2/1 product series has different types of power supply pins:

VDDIN pin: Power for the internal voltage regulator, ADC, DAC, and analog comparator power supplies. This voltage ranges from 1.8V to 3.6V.

VDDIO pin: Powers the Peripheral I/O lines, Backup part, 32 kHz crystal oscillator and oscillator pads. This voltage ranges from 1.62V to 3.6V.

VDDOUT pin: Output of the internal voltage regulator.

VDDCORE pin: Powers the core, including the processor, the embedded memories and the peripherals. This voltage ranges from 1.62V to 1.95V.

VDDPLL pin: Powers the PLL, the Fast RC and the 3 to 20 MHz oscillators. This voltage ranges from 1.62V to 1.95V.

4.3.6UART

The Universal Asynchronous Receiver Transmitter features a two-pin UART that can be used for communication and trace purposes. It offers an ideal channel for in-situ programming solutions. This UART is associated with two PDC channels to reduce the processor time on packet handling.

The two-pin UART (TXD and RXD only) is buffered through an RS232 Transceiver MN8 and brought to the DB9 male connector J4.

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Figure 4-5.	UART
						MN8
			+3V3			MAX3232CSE
					16			1
						VCC	C1+
					C39			C38
					100nF			100nF
	+3V3		+3V3	C40	2	V+	C1-	3
					6			4
				100nF		V-	C2+		J4
	R35		R36		C41			C42	1
					100nF			100nF	6
	100K		100K
					15			5	2
						GND	C2-
									7
	PA10		R39	0R	11	T1IN	T1OUT	14	3
	PA9		R40	0R	12			13	8
					10	R1OUT	R1IN	7	4
			R41	0R	9	T2IN	T2OUT	8	9
						R2OUT	R2IN		5
	TP6	TP7			DGND	UART		DGND	<![if ! IE]> <![endif]>10	<![if ! IE]> <![endif]>11
	SMD	SMD
									FGND

4.3.7Display Interface

The SAM3N-EK carries a TFT Transmissive LCD module with touch panel, TM020GDZ18. Its integrated driver IC is ILI9225B. The LCD display area is 2.0 inches diagonally measured, with a native resolution of 176x220 pixels.

The LCD module gets reset from GPIO PA29. The LCD chip select signal is connected to NPCS2. The SAM3N communicates with the LCD through the SPI bus.

Figure 4-6. LCD

NPCS_LCD

SPI CLK

SPI MOSI

			+3V3
		+ C30	C31	R18	R60
		10uF	100nF	47K	47K
			DGND				MN6
						1	TM020GDZ18
							ID
PA30						2
PA14	R19	0R				3	NCS
PA13						4	SCL
							SDA
PA28						5
PA29						6	RS
						7	NREST
						8	GND
						9	IOVDD
			LED_A	R21	0R	10	VDD
			LED_K1			11	LEDA
			LED_K2			12	LEDK1
		DGND	LED_K3			13	LEDK2
						14	LEDK3
						15	Y+
						16	Y-
			LCD			17	X+
						18	X-
							NC

4.3.8Backlight Control

The LCD backlight is made of four integrated white chip-LEDs arranged in parallel. These are driven by an AAT3193 charge pump, MN5. The AAT3193 is controlled by the SAM3N through a single PIO line interface (PC13); the 0 Ohm resistor R17 is mounted in series on this line, which permits to use it for other custom purposes. In that case, the pull-up resistor R64 maintains the charge pump permanently enabled by default.

On the anode drive line, a 0 Ohm resistor R21 is implemented in series for an optional current limitation.

SAM3N-EK Development Board User Guide			4-5

11080C–ATARM–30-Mar-11