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SAM4S-EK
User Manual
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Atmel SAM4S-EK User Manual

SAM4S-EK Development Board
....................................................................................................................
User Guide
11139A–ATARM–29-Nov-11
1-2 SAM4S-EK Development Board User Guide
11139A–ATARM–29-Nov-11
Section 1
Introduction.................................................................................................................1-1
1.3 References and Applicable Documents ............................................................................. 1-1
Section 2
Kit Contents ................................................................................................................2-1
Section 3
Power Up....................................................................................................................3-1
3.2 Sample Code and Technical Support ................................................................................ 3-1
Section 4
Evaluation Kit Hardware .............................................................................................4-1
4.3.1 Processor............................................................................................................. 4-2
4.3.2 Memory ................................................................................................................ 4-2
4.3.3 Clock Circuitry ...................................................................................................... 4-3
4.3.4 Reset Circuitry ..................................................................................................... 4-4
4.3.5 Power Supply and Management .......................................................................... 4-4
4.3.6 UART ................................................................................................................... 4-5
4.3.7 USART................................................................................................................. 4-5
4.3.8 RS232 .................................................................................................................. 4-6
4.3.9 RS485 .................................................................................................................. 4-6
4.3.10 Display Interface .................................................................................................. 4-6
4.3.11 LCD Module ........................................................................................................ 4-6
4.3.12 Backlight Control.................................................................................................. 4-7
4.3.13 Touch Screen Interface ....................................................................................... 4-8
4.3.14 JTAG/ICE............................................................................................................. 4-8
4.3.15 Audio Interface..................................................................................................... 4-9
4.3.16 Microphone Input ................................................................................................. 4-9
4.3.17 USB Device ....................................................................................................... 4-11
4.3.18 Analog Interface ................................................................................................ 4-11
4.3.19 QTouch Elements .............................................................................................. 4-12
4.3.20 User Buttons ...................................................................................................... 4-13
SAM4S-EK Development Board User Guide 1-1
11139A–ATARM–29-Nov-11
4.3.21 LEDs .................................................................................................................. 4-14
4.3.22 SD/MMC Card.................................................................................................... 4-14
4.3.23 ZigBEE............................................................................................................... 4-14
4.3.24 PIO Expansion................................................................................................... 4-15
4.4.1 PIO Usage ......................................................................................................... 4-16
4.4.2 Jumpers ............................................................................................................. 4-19
4.4.3 Test Points ......................................................................................................... 4-20
4.4.4 Solder Drops ...................................................................................................... 4-20
4.4.5 Assigned PIO Lines, Disconnection Possibility .................................................. 4-20
4.5.1 Power Supply Connector J9 .............................................................................. 4-22
4.5.2 USART Connector J5 With RTS/CTS Handshake Support ............................... 4-22
4.5.3 UART Connector J7 .......................................................................................... 4-23
4.5.4 USB Device Connector J15 ............................................................................... 4-23
4.5.5 TFT LCD Connector J8 ...................................................................................... 4-24
4.5.6 JTAG Debugging Connector J6 ......................................................................... 4-25
4.5.7 SD/MMC - MCI Connector J3 ............................................................................ 4-26
4.5.8 Analog Connector CN1 & CN2 .......................................................................... 4-27
4.5.9 RS485 Connector J14 ....................................................................................... 4-27
4.5.10 Headphone Connector J11................................................................................ 4-28
4.5.11 ZigBEE Connector J16 ...................................................................................... 4-28
4.5.12 PIO Expansion Port C Connector J12 ............................................................... 4-29
4.5.13 PIO Expansion Port A Connector J13 .............................................................. 4-30
4.5.14 PIO Expansion Port B Connector J14 ............................................................... 4-31
Section 5
Schematics .................................................................................................................5-1
Section 6
Troubleshooting..........................................................................................................6-1
Section 7
Revision History..........................................................................................................7-1
1-2 SAM4S-EK Development Board User Guide
11139A–ATARM–29-Nov-11
1.1 SAM4S Evaluation Kit
The SAM4S Evaluation Kit (SAM4S-EK) enables evaluation capabilities and code development of appli­cations running on a SAM4S16 device.
1.2 User Guide
This guide focuses on the SAM4S-EK board as an evaluation platform. It is made up of 6 sections:
Section 1 includes references, applicable documents, acronyms and abbreviations.
Section 2 describes the kit contents, its main features and specifications.
Section 3 provides board specifications.
Section 4 describes the development environment.
Section 5 provides instructions to power up the SAM4S-EK and describes how to use it.
Section 6 describes the hardware resources, default jumper and switch settings, and connectors.
Section 7 provides schematics.
Section 8 describes the troubleshooting.
Introduction
Section 1
Introduction
1.3 References and Applicable Documents
Table 1-1. References and Applicable Documents
Title Comment
SAM4S Datasheet
http://www.atmel.com/dyn/resources/prod_documents/11100.pdf
SAM4S-EK Development Board User Guide 1-1
11139A–ATARM–29-Nov-11
2.1 Deliverables
The Atmel®SAM4S-EK toolkit contains the following items:
Board:
– a SAM4S-EK board
– a universal input AC/DC power supply with US, Europe and UK plug adapters
Cables:
– one USB cable
– one serial RS232 cable
A Welcome Letter
Figure 2-1. Unpacked SAM4S-EK
Section 2
Kit Contents
Unpack and inspect the kit carefully. Contact your local Atmel distributor, should you have issues con­cerning the contents of the kit.
SAM4S-EK Development Board User Guide 2-1
11139A–ATARM–29-Nov-11
Kit Contents
2.2 Electrostatic Warning
The SAM4S-EK board is shipped in a protective anti-static package. The 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.
2-2 SAM4S-EK Development Board User Guide
11139A–ATARM–29-Nov-11
3.1 Power 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 display a welcome page. Then, click or touch icons displayed on the screen and enjoy the demo.
3.2 Sample 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://www.atmel.com/dyn/products/tools.asp?category_id=163&family_id=605&subfamily_id=2404
Figure 3-1. Atmel Website for AT91SAM Products
Section 3
Power Up
SAM4S-EK Development Board User Guide 3-1
11139A–ATARM–29-Nov-11
4.1 Board Overview
This section introduces the Atmel SAM4S Evaluation Kit design. It introduces system-level concepts, such as power distribution, memory, and interface assignments.
The SAM4S-EK board is based on the integration of an ARM®Cortex®-M3 processor with on-board NAND 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. SAM4S-EK Block Diagram
Section 4
Evaluation Kit Hardware
SAM4S-EK Development Board User Guide 4-1
11139A–ATARM–29-Nov-11
Evaluation Kit Hardware
4.2 Features List
Here is the list of the main board components and interfaces:
SAM4S16 chip LQFP100 package with optional socket footprint
12 MHz crystal
32.768 KHz crystal
Optional SMB connector for external system clock input
NAND Flash
2.8 inch TFT color LCD display with touch panel and backlight
UART port with level shifter circuit
USART port with level shifter circuit multiplexed with RS485 port with level shifter circuit
Microphone input and mono/stereo headphone jack output
SD/MMC interface
Reset button: NRST
User buttons: Left and Right
QTouch
Full Speed USB device port
JTAG/ICE port
On-board power regulation
Two user LEDs
Power LED
BNC connector for ADC input
BNC connector for DAC output
User potentiometer connected to the ADC input
ZigBEE connector
2x32 bit PIO connection interfaces (PIOA, PIOC) and 1x16 bit PIO connection interface (PIOB)
®
buttons: Up, Down, Left, Right, Valid and Slider
4.3 Function Blocks
4.3.1 Processor
The SAM4S-EK is equipped with a SAM4S16 device in LQFP100 package.
4.3.2 Memory
The SAM4S16 chip embeds:
1024 Kbytes of embedded Flash
128 Kbytes of embedded SRAM
16 Kbytes of ROM with embedded BootLoader routines (UART, USB) and In-Application Programming
functions (IAP) routines.
4-2 SAM4S-EK Development Board User Guide
11139A–ATARM–29-Nov-11
Evaluation Kit Hardware
The SAM4S features an External Bus Interface (EBI) that permits interfacing to a broad range of external memories and virtually to any parallel peripheral. The SAM4S-EK board is equipped with a memory device connected to the SAM4 EBI:
One NAND Flash MT29F2G08ABAEA.
Figure 4-2. NAND Flash
+3V3
+3V3
PC17 PC16 PC9 PC10
JP9
JP9 Header2
Header2
PC14
PC18
R19 0RR19 0R
R21 47KR21 47K
R15
R15 47K
47K
DGND
+3V3
R22
R22 0R nm
0R nm
R16
R16 47K
47K
NAND FLASH
MN3MN3 MT29F2G08ABAEA
16
CLE
17
ALE
8
RE
18
WE
9
CE
7
R/B
19
WP
1
N.C1
2
N.C2
3
N.C3
4
N.C4
5
N.C5
6
N.C6
10
N.C7
11
N.C8
14
N.C9
15
N.C10
20
N.C11
21
N.C12
22
N.C13
23
N.C14
24
N.C15
25
N.C16
26
N.C17
I/O0 I/O1 I/O2 I/O3 I/O4 I/O5 I/O6 I/O7
N.C28 N.C27 N.C26 N.C25 N.C24 N.C23
PRE N.C22 N.C21 N.C20 N.C19 N.C18
VCC
VCC
VSS
VSS
29 30 31 32 41 42 43 44
48 47 46 45 40 39 38 35 34 33 28 27
37 12
36 13
PC0 PC1 PC2 PC3 PC4 PC5 PC6 PC7
C27
C27 100nF
100nF
C28
C28 100nF
100nF
+3V3
DGND
C29
C29 1uF
1uF
NCS0 chip select signal is used for NAND Flash chip selection. Furthermore, a dedicated jumper (JP9) can disconnect it from the on-board memories, thereby letting NCS0 free for other custom purpose.
4.3.3 Clock Circuitry
The clock generator of a SAM4S microcontroller is made up of:
A Low Power 32.768 Hz Slow Clock Oscillator with bypass mode.
A 3 to 20 MHz Crystal Oscillator, which can be bypassed (12 MHz needed in case of USB).
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 PLL (PLLB) providing a clock for the USB Full Speed Controller.
A 60 to 130 MHz programmable PLL (PLLA), capable to provide the clock MCK to the processor and
to the peripherals. The input frequency of PLLA is from 7.5 and 20 MHz.
The SAM4S-EK board is equipped with one 12 MHz crystal, optional Piezoelectric Ceramic Resonator 12 Mhz (Murata ref. CSTCE12M0G15L99-R0), one 32.768 Hz crystal and an external clock input con­nector (optional, not populated by default).
Figure 4-3. External Clock Source
NOT POPULATE
2 3
J1J1
DGND
D
1
54
DGND
R2
49.9R 1%R249.9R 1%
R1 DNPR1 DNP
3
DGND
R
R
3DNP
3DNP
1
Y1Y1 D
NP
2
R
7DN
7DN
PR
P
DGND
C
C
1 20pF
1 20pF
C
C
2 20pF
2 20pF
212MHz
212MHz
Y
Y
R40RR40R
R50
R50
3
3
C
C 20pF
20pF
MN1
12BTRG
MN1
DGND
C4 20pFC420pF
49
8
4
R9 DNPR9 DNP
32
XIN
R10DNPR10DNP
XOUT32
XIN
PB9
R6 DN
R6 DN
R
R
PB8
XO
R8 DN
R8 DN
97
P
P
PB9_XIN
PB8_XOUT
SAM4S
PA7_RTS0_PWMH3
PA8_CTS0_AD
UT
96
P
P
R1
R1
1
1
0R
0R
R12
R12 0
0
XIN32
XOUT32
R
R
1
3
Y3
Y3
32.768KHz
32.768KHz
2
PA7 PA8
SAM4S-EK Development Board User Guide 4-3
11139A–ATARM–29-Nov-11
Evaluation Kit Hardware
The SAM4S chip internally generates the following clocks:
SLCK, the Slow Clock, which is the only permanent clock of the system
MAINCK, the output of the Main Clock Oscillator selection: either a Crystal Oscillator or a 4/8/12 MHz
Fast RC Oscillator
PLLACK, the output of the Divider and 60 to 130 MHz programmable PLL (PLLA)
PLLBCK, the output of the Divider and 60 to 130 MHz programmable PLL (PLLB)
4.3.4 Reset Circuitry
On-board NRST button BP1 provides an external reset control of the SAM4S.
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 Core and the peripherals. The NRST pin integrates a permanent pull-up resistor of about 100 kOhm to VDDIO.
On the SAM4S-EK board, the NRST signal is connected to the LCD module and JTAG port.
Note: At power-on, the NRST signal is asserted with a default duration of 2 clock cycles. That duration may not be
sufficient to correctly reset any other system or board devices connected to that signal. First, in your custom application, you need to check for these devices' datasheets about reset duration requirements. Then, you need to set an appropriate configuration in the NRST Manager. This is done through the ERSTL field in the RSTC_MR register. The NRST duration is thereby configurable between 60 µs and 2 s, whether it is subse­quently activated by a software reset or a user reset. Refer to the SAM4S datasheet for in depth information.
4.3.5 Power Supply and Management
The SAM4S-EK board is supplied with an external 5V DC block through input J9. It is protected by a PolyZen diode MN9 and an LC combinatory filter MN10. The PolyZen is used in the event of an incorrect power supply connection.
The adjustable LDO regulator MN12 is used for the 3.3V rail main supply. It powers all the 3.3V compo­nents on the board.
Figure 4-4. Power Block
The SAM4S product series has different types of power supply pins:
J9
J9
Power Jack 2.1mm
Power Jack 2.1mm
1 2
3
+5V
MN9
MN9 ZEN056V130A24LS
ZEN056V130A24LS
1
3
2
MN12
MN12 MIC29152WU
MIC29152WU
Micrel's 1.5A LDO, TO263-5
Micrel's 1.5A LDO, TO263-5
VIN2VOUT
1
SD
ADJ
GND1
GND2
3
6
DGND
MN10
MN10 BNX002-01
BNX002-01
1
SV
2
SG
C65
C65 22uF
22uF
R89
R89 169K 1%
169K 1%
R92
R92 102K 1%
102K 1%
CG1 CG2 CG3
+
+
C64
C64 100nF
100nF
4
5
3
CV
4 5 6
+
+
C75
C75 100uF-TAN-6.3V
100uF-TAN-6.3V
+3V3
C76
C76 100nF
100nF
+5V
DGND
+
+
+
+
C66
C66
C98
C98
22uF
22uF
220uF-ELE-16V
220uF-ELE-16V
VDDIN pin:
Power for the internal voltage regulator, ADC, DAC, and analog comparator power supplies. The voltage ranges from 1.8V to 3.6V.
4-4 SAM4S-EK Development Board User Guide
11139A–ATARM–29-Nov-11
4.3.6 UART
Evaluation Kit Hardware
VDDIO pins:
Power for the Peripherals I/O lines. The voltage ranges from 1.62V to 3.6V.
VDDOUT pin:
Output of the internal voltage regulator.
VDDCORE pins:
Power for the core, including the processor, embedded memories and peripherals. The voltage ranges from 1.62V to 1.95V.
VDDPLL pin:
Power for the PLL A, PLL B and 12 MHz oscillator. The voltage ranges from 1.62V to 1.95V.
Note: VDDPLL should be decoupled and filtered from VDDCORE.
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.
4.3.7 USART
This two-pin UART (TXD and RXD only) is buffered through an RS232 Transceiver MN6 and brought to the DB9 male connector J7.
Figure 4-5. UART
MN6
MN6 MAX3232CSE
MAX3232CSE
16
9
9
VCC
2
V+
6
V-
5
1
GND
1
1
IN
T1
2
1
UT
R1O
0
1
IN
T2
9
UT
R2O
C1+
C1-
C2+
C2-
T1OUT
R1IN
T2OUT
R2I
1
C38
C38 100nF
100nF
3
4
C42
C42 100nF
100nF
5
1
4
1
3 7 8
N
DGND
1 6 2 7 3 8 4 9 5
FGND
J7J7
10
11
PA10 PA9
+
T
T SMD
SMD
3V3
P5
P5
R
R 100K
100K
45
45
+3V3
R46
R46 100
100
R470
R470
R480
R480
+3V3
C3
C3
100nF
100nF
C40
C40 100nF
100nF
C41
C41 100nF
K
K
100nF
R
R
R
R
GND
D
TP6
TP6 SM
SM
D
D
The Universal Synchronous/Asynchronous Receiver Transmitter (USART) provides one full duplex uni­versal synchronous/asynchronous serial link. The data frame format is extensively configurable (data length, parity, number of stop bits) to support a broad range of serial communication standards. The USART is also associated with PDC channels for TX/RX data access.
Note: For design optimization purposes, both transmitters have been implemented on the same
PIO lines, that is PA21, 22, 23, 24 25.
To avoid any electrical conflict, the RS485 transceiver is isolated from the receiving line PA21.
Should you need to implement an RS485 channel in place of the RS232, follow the procedure below:
1. make sure your software will permanently set PA23 to a high level - this will permanently disable the RS232 receiver.
2. solder a shunt resistor in place of R25 (a solder drop will do).
SAM4S-EK Development Board User Guide 4-5
11139A–ATARM–29-Nov-11
Evaluation Kit Hardware
4.3.8 RS232
SAM4S-EK connects the USART1 bus (including TXD, RXD, RTS, CTS handshake signal controls and EN command) to the DB9 male connector J5 through the RS232 Transceiver MN5.
Figure 4-6. USART
TXD1 RXD1 RTS1 CTS1
PA23
PA22 PA21_232 PA24 PA25
+3V3
+3V3
+3V3
C31
C31
4.7uF
4.7uF
DGND
R32
R32 47K
47K
R31 0RR31 0R
R33 0RR33 0R R34 0RR34 0R R35 0RR35 0R R36 0RR36 0R
R37 47KR37 47K
C32
C32 100nF
100nF
DGND
C33
C33 100nF
100nF
C36
C36 100nF
100nF
USART
MN5
MN5 ADM3312EARU
ADM3312EARU
3
VCC
1
V+
21
V-
23
GND
19
SD
5
EN
T1IN7T1OUT
10
R1OUT T2IN8T2OUT
11
R2OUT
9
T3IN
12
R3OUT
R1IN
R2IN
T3OUT
R3IN
C1+
C1­C2+
C2­C3+
C3-
6
20 2
4 24
22
18 15 17 14 16 13
C34
C34 100nF
100nF
C35
C35 100nF
100nF
C37
C37 100nF
100nF
R38 0RR38 0R
PA21_485
PA21
PA21_232
DGND
3
2
JP31JP31
1
J5J5
1 6 2 7 3 8 4 9 5
10
11
FGND
4.3.9 RS485
As noticed above, the USART1 is shared with the RS485 port, connected to the transceiver MN4, con­nected to the 3-point connector J4. The design includes selectable jumpers for RS485 bus termination resistors selection (JP10, JP11, JP12).
Figure 4-7. RS485
4.3.10 Display Interface
The SAM4S-EK carries a TFT Transmissive LCD module with touch panel, FTM280C34D. Its integrated driver IC is ILI9325. The LCD display area is 2.8 inches diagonally measured, with a native resolution of 240 x 320 dots.
RXD1
CTS1
RTS1
TXD1
PA21_485
PA25
PA24
PA22
R25 0R nmR25 0R nm
R27 0RR27 0R
R28 0RR28 0R
+3V3 +3V3
RS 485
R23
R23 10K
10K
MN4
MN4 ADM3485ARZ
JP28
JP28 Header2 nm
Header2 nm
ADM3485ARZ
1
RO
2
RE
3
DE
4
DI
VCC
GND
A B
+3V3
8
5
6 7
DGND
C30
C30 100nF
100nFR26 0RR26 0R
R29
R29 120R
120R
JP11
JP11 Header2
Header2
DGND
R24
R24 0R nm
0R nm
JP10
JP10 Header2
Header2
JP12
JP12 Header2
Header2
R30
R30 0R nm
0R nm
FGND
J4J4
1
2
3
4.3.11 LCD Module
The LCD module gets reset from the NRST signal. As explained, this NRST is shared with the JTAG port and the push-button BP1. The LCD chip select signal is connected to NCS1; the jumper JP13 can dis­connect it so that this PIO line is available for other custom usage.
The SAM4S communicates with the LCD through PIOC where an 8-bit parallel “8080-like” protocol data bus has to be implemented by software.
4-6 SAM4S-EK Development Board User Guide
11139A–ATARM–29-Nov-11
Figure 4-8. LCD Block
PC[0..31]
PC13 PC22 PC23 PC24 PC25 PC26 PC27 PC28 PC29 PC30 PC31
+3V3
R56
R56
10K
10K
R58
R58
4.7K
4.7K
DGND
3
4
5
2
NOT POPULATED
DGND
NRST
The part is placed as close as possible to J8
D1
D1 PACDN044Y5R nm
PACDN044Y5R nm
TVS, SOT23-5
TVS, SOT23-5
NRST
X_RIGHT Y_UP X_LEFT Y_DOWN
1
PC7 PC6 PC5 PC4 PC3 PC2 PC1 PC0
PC11 PC8 PC19
PC15
+
+
C43
C43 10uF
10uF
LED_A
+3V3
C44
C44 100nF
100nF
DGND
JP13 Header2JP13 Header2
R59 0RR59 0R
C45
C45 100nF
100nF
LCD_DB17
LCD_DB16 LCD_DB15 LCD_DB14 LCD_DB13 LCD_DB12 LCD_DB11 LCD_DB10
LCD_DB9 LCD_DB8 LCD_DB7 LCD_DB6 LCD_DB5 LCD_DB4 LCD_DB3 LCD_DB2 LCD_DB1 LCD_DB0
LED_K1 LED_K2 LED_K3 LED_K4 Y_UP Y_DOWN X_RIGHT X_LEFT
R49
R49 47K
47K
DGND
J8
J8 FH26-39S-0.3SHW
FH26-39S-0.3SHW
1
VDD
2
DB17
3
DB16
4
DB15
5
DB14
6
DB13
7
DB12
8
DB11
9
DB10
10
DB9
11
DB8
12
DB7
13
DB6
14
DB5
15
DB4
16
DB3
17
DB2
18
DB1
19
DB0
20
VDD
21
RD
22
WR
23
RS
24
CS
25
RESET
26
IM0
27
IM1
28
GND
29
LED-A
30
LEDK1
31
LEDK2
32
LEDK3
33
LEDK4
34
Y+
35
Y-
36
X+
37
X-
38
NC
39
GND
LCD
Evaluation Kit Hardware
DGND
PIN 39
PIN 39
PINs
PINs on
on BOT
BOT
PIN 1
PIN 1
DGND DGND
Six slots on PCB for LCD shield
LCD_DB0
LCD_DB4 LCD_DB2 LCD_DB3 LCD_DB1 LCD_DB8 LCD_DB6 LCD_DB7 LCD_DB5
LCD_DB9
FTM280C34D
FTM280C34D
R61 4.7K nmR61 4.7K nm
1 2 3 4 1 2 3 4 5
R63 4.7K nmR63 4.7K nm
8 7
RA2
RA2
6
4.7Kx4 nm
4.7Kx4 nm
5 8 7
RA3
RA3
6
4.7Kx4 nm
4.7Kx4 nm
DGNDDGND
Z7
Z7
DGND
DGND
4.3.12 Backlight Control
The LCD backlight is made of four integrated white chip-LEDs arranged in parallel. These are driven by an AAT3155 charge pump, MN8.The AAT3155 is controlled by the SAM4S through a single PIO line PC13 interface; the 0 Ohm resistor R68 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 R59 is implemented in series for an optional current limitation.
Figure 4-9. Backlight Control
+3V3
PC13
R680RR68 0R
FB1
FB1 BN03K314S300R
BN03K314S300R
+3V3
R64
R64 47K
47K
DGND
MN8
MN8 AAT3155ITP-T1
AAT3155ITP-T1
10
C1+
C54
C54 1uF
1uF
9
C1-
11
EN/SET
5
IN
C57
C57
4.7uF
4.7uF
4
GND
LCD BACKLIGHT
C2+
OUTCP
7
C55
C55 1uF
6
C2-
8
3
D1
2
D2
1
D3
12
D4
1uF
LED_A
LED_K1 LED_K2 LED_K3 LED_K4
TP7TP7
DGND
C56
C56 1uF
1uF
SAM4S-EK Development Board User Guide 4-7
11139A–ATARM–29-Nov-11
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