View detail for Atmel AT01777: SAM4L Schematic Checklist

APPLICATION NOTE
Atmel AT01777: SAM4L Schematic Checklist
Atmel 32-bit Microcontrollers
Features
•
•
•
•
•
•
•
•
•
•
•
Power circuits
Reset circuit
ADC connection
Clock and crystal oscillators
JTAG and SWD debug ports
Capacitive Touch (CATB) Module
USB connection
Segment LCD connection
Miscellaneous topics
Suggested reading
Patents and Trademarks
• Atmel® QTouch® (patented charge-transfer method)
Introduction
A good hardware design comes from a proper schematic. Since SAM4L devices have
a fair number of pins and functions, the schematic for these devices can be large and
quite complex.
This application note describes a common checklist which should be used when
starting and reviewing the schematics for a SAM4L design.
42025D−SAM4L−11/2013
1.
Power Circuit
1.1
Choosing the Right Regulator Mode for the Application
ATSAM4L internal voltage regulator has two modes: switching or linear mode. This configuration has to be set once for
all when designing the schematic by using a pull up or a pull down on the BUCK/LDOn pin depending on the chosen
mode. The BUCK/LDOn is sampled on power on reset and remains available for the application after reset.
Figure 1-1 shows the mandatory requirements for the power supply in the two modes:
Figure 1-1. Regulator Choice vs. VDDIN Voltage.
Atmel AT01777: SAM4L Schematic Checklist [APPLICATION NOTE]
42025D−SAM4L−11/2013
2
Table 1-1 details the pros and cons of the two modes:
1.2
Table 1-1.
Regulator Mode Choice.
Criteria
Switching mode
Linear mode
BOM Cost
Requires an external 22µH inductor.
Requires a good quality ceramic capacitor on VDDCORE.
(see minimum requirements in the datasheet)
Minimal cost.
Component
size
Requires an external 22µH inductor.
Minimal size.
Emitted
noise
Proper filtering and decoupling is needed in noise
sensitive applications due to switching regulator.
Note: The SAM4L has a “Stop/Restart switching” feature
that can be use to stop the switching noise for the
time to make an ADC measurement and then
restart the regulation loop after measurement is
done. Refer to the Peripheral Event Controller
section of the datasheet.
Minimal emitted noise.
Switching Mode
Figure 1-2. Switching Mode Example Schematic.
Close to each pin
VLCDIN
100nF
VDDIO
100nF
VDDIN
1.80V-3.60V Input
10µF
100nF
LVDDANA
VDDANA
[email protected]
Voltage
Regulator
Buck mode
100nF
VDDOUT
22µH
100 kOhm max
VDDCORE
4.7µF min
GPIO Available
after reset
100nF
BUCK/LDOn/
PA02
GND
Atmel AT01777: SAM4L Schematic Checklist [APPLICATION NOTE]
42025D−SAM4L−11/2013
3
Table 1-2.
Notes:
Switching Mode Power Supply Checklist.
Signal name
Recommended pin connection
Description
Supply input
VDDIN = VDDIO = VDDANA =
VLCDIN (3)
The supply pins must be at the same potential.
VLCDIN(3)
1.80V to 3.60V
100nF X7R (1)(2)
Decoupling/filtering capacitor
Powers the LCD voltage pump.
Decoupling/filtering capacitors must be added to minimize
voltage ripple.
VDDIO
1.80V to 3.60V
100nF X7R (1)(2)
Decoupling/filtering capacitor
Powers I/O lines, the general purpose oscillator (OSC), the
80MHz integrated RC oscillator (RC80M).
Decoupling/filtering capacitors must be added to minimize
voltage ripple.
VDDANA
1.80V to 3.60V
100nF X7R (1)(2)
Decoupling/filtering capacitor
Powers the ADC, the DAC, the Analog Comparators, the
32kHz oscillator (OSC32K), the 32kHz integrated RC oscillator
(RC32K) and the Brown-out detectors (BOD18 and BOD33).
Decoupling/filtering capacitors must be added to minimize
voltage ripple.
VDDIN
1.80V to 3.60V
Decoupling/filtering capacitors
100nF X7R (1)(2) and 10µF (1)
Powers I/O lines and internal voltage regulator.
Decoupling/filtering capacitors must be added to improve
startup stability and reduce source voltage drop.
VDDOUT
Connect a 22µH inductor from
VDDOUT to VDDCORE
Output of the on-chip voltage regulator. Switching frequency:
1MHz.
Inductor recommended reference: Wire Wound type with DC
resistance <0.7Ω and saturation current >300mA (Ex: Murata
LQH3NPN220MJ0 or Taiyo Yuden NR4018T220M).
VDDCORE
Decoupling/filtering capacitors
100nF X7R (1)(2) and 4.7µF X7R (1)
Powers the core, memories, peripherals, the PLL, the DFLL,
and the 4 MHz integrated RC oscillator (RCFAST) and the
115kHz integrated RC oscillator (RCSYS).
Decoupling/filtering capacitors must be added to improve
startup stability and reduce source voltage drop.
BUCK/LDOn
100kΩ (maximum) pull up resistor
to VDDIN.
Selects the regulator mode on power on reset. The pin is
available for the application after reset.
1.
These values are given only as a typical example.
2.
Capacitor should be placed as close as possible to each pin in the signal group, vias should be avoided.
3.
Only on LCD capable devices (ATSAM4LCx).
Atmel AT01777: SAM4L Schematic Checklist [APPLICATION NOTE]
42025D−SAM4L−11/2013
4
1.3
Linear Mode
Figure 1-3. Linear Mode Example Schematic.
Close to each pin
VLCDIN
100nF
VDDIO
100nF
VDDIN
1.80V-3.60V Input
10µF
100nF
LVDDANA
VDDANA
[email protected]
Voltage
Regulator
LDO mode
100nF
VDDOUT
VDDCORE
4.7µF min
GPIO Available
after reset
100nF
BUCK/LDOn/
PA02
100kOhm max
GND
Atmel AT01777: SAM4L Schematic Checklist [APPLICATION NOTE]
42025D−SAM4L−11/2013
5
Table 1-3.
Notes:
1.4
Linear Mode Power Supply Checklist.
Signal name
Recommended pin connection
Description
Supply input
VDDIN = VDDIO = VDDANA =
VLCDIN (3)
The supply pins must be at the same potential.
VLCDIN (3)
1.80V to 3.60V
100nF X7R (1)(2)
Decoupling/filtering capacitor
Powers the LCD voltage pump.
Decoupling/filtering capacitors must be added to minimize
voltage ripple.
VDDIO
1.80V to 3.60V
100nF X7R (1)(2)
Decoupling/filtering capacitor
Powers I/O lines, the general purpose oscillator (OSC), the
80MHz integrated RC oscillator (RC80M).
Decoupling/filtering capacitors must be added to minimize
voltage ripple.
VDDANA
1.80V to 3.60V
100nF X7R (1)(2)
Decoupling/filtering capacitor
Powers the ADC, the DAC, the Analog Comparators, the
32kHz oscillator (OSC32K), the 32kHz integrated RC oscillator
(RC32K) and the Brown-out detectors (BOD18 and BOD33).
Decoupling/filtering capacitors must be added to minimize
voltage ripple.
VDDIN
1.80V to 3.60V
Decoupling/filtering capacitors
100nF X7R (1)(2) and 10µF(1)
Powers I/O lines and internal voltage regulator.
Decoupling/filtering capacitors must be added to improve
startup stability and reduce source voltage drop.
VDDOUT
Connect VDDOUT to VDDCORE
Output of the on-chip voltage regulator.
VDDCORE
Decoupling/filtering capacitors
100nF X7R (1)(2) and 4.7µF X7R (1)
Powers the core, memories, peripherals, the PLL, the DFLL,
and the 4 MHz integrated RC oscillator (RCFAST) and the
115kHz integrated RC oscillator (RCSYS).
Decoupling/filtering capacitors must be added to improve
startup stability and reduce source voltage drop.
BUCK/LDOn
100kΩ (maximum) pull down
resistor to GND.
Selects the regulator mode on power on reset. The pin is
available for the application after reset.
1.
These values are given only as a typical example.
2.
Capacitor should be placed as close as possible to each pin in the signal group, vias should be avoided.
3.
Only on LCD capable devices (ATSAM4LCx).
GPIO Cluster Supply on LCD Capable Devices
If, for some reason, the LCD controller of an LCD capable device is not used at all, refer to 7.2 When not using the LCD.
Atmel AT01777: SAM4L Schematic Checklist [APPLICATION NOTE]
42025D−SAM4L−11/2013
6
2.
Analog Schematics
The ATSAM4L features a differential ADC, a DAC and an analog comparator.
2.1
ADC Reference Voltage Schematic
Figure 2-1. ADC Reference Voltage Example Schematic.
Close to pin
VREF
ADVREFP
4.7µF
100nF
ADVREFN
GNDANA
Table 2-1.
Notes:
2.2
Linear Mode Power Supply Checklist.
Signal name
Recommended pin connection
Description
ADVREFP
1.0V to VDDANA
100 nF X7R (1)(2)
Decoupling/filtering capacitor
ADVREFP is a pure analog input.
The 100nF capacitor.
The 4.7µF capacitor is recommended in applications where low
frequency noise is expected.
ADVREFN
Connect to GNDANA
GNDANA
Connect to same voltage level as
GND
This pin is not internally connected to other GND pins.
1.
These values are given only as a typical example.
2.
Capacitor should be placed as close as possible to each pin in the signal group, vias should be avoided.
ADC Analog Inputs
Table 2-2.
ADC Analog Input Connection Checklist.
Signal name
Recommended pin connection
Description
ADx
Source impedance is low enough
to avoid drops of voltage when the
ADC samples the input.
Refer to “Inputs and Sample and Hold Acquisition Times” in
Electrical characteristics section of the datasheet.
ADx
Measured voltage is between
10% and 90% of reference
voltage.
Operation outside this range leads to lower accuracy.
Refer to Electrical characteristics section of the datasheet for
details.
ADx
Selection of the ADC inputs when
using differential mode.
Differential mode:
- In the MUXNEG table, the input signal is selected among
the AD[7..0] inputs.
- In the MUXPOS table, the input signal is selected among
the AD[14..0] inputs.
Atmel AT01777: SAM4L Schematic Checklist [APPLICATION NOTE]
42025D−SAM4L−11/2013
7
3.
Reset Circuit
Figure 3-1. Reset Circuit Example Schematic.
Table 3-1.
Reset Circuit Checklist.
Signal name
RESET
Recommended pin connection
Description
The RESET_N pin is a Schmitt input and integrates a
permanent pull-up resistor to VDDIN. As the product integrates
a power-on reset detector, the RESET_N pin can be left
unconnected in case no reset from the system needs to be
applied to the product.
Atmel AT01777: SAM4L Schematic Checklist [APPLICATION NOTE]
42025D−SAM4L−11/2013
8
4.
Clocks and Crystal Oscillators
4.1
External Clock Source
Figure 4-1. External Clock Source Schematic.
Table 4-1.
4.2
External Clock Source Checklist.
Signal name
Recommended pin connection
Description
XIN
Connected to clock output from
external clock source.
Up to VDDIO volt square wave signal.
Input frequency up to 50MHz.
Refer to the datasheet for duty cycle requirements.
XOUT
Can be left unconnected or used
as a standard pin.
Crystal Oscillator
Figure 4-2. Crystal Oscillator Example Schematic.
Table 4-2.
Crystal Oscillator Checklist.
Signal name
Notes:
1.
Recommended pin connection
(1)
XIN
Biasing capacitor 22pF
XOUT
Biasing capacitor 22pF (1)
Description
External crystal between 0.6MHz and 30MHz, powered by
VDDIO.
The crystal and capacitors should be located close to the device
to minimize noise emission and improve immunity.
Powered by VDDIO.
These values are given only as a typical example and depend on the crystal parameters, PCB tracks capacitance
and MCU package. To determine the suitable value for the application, refer to the “Electrical characteristics”
section of the datasheet.
Atmel AT01777: SAM4L Schematic Checklist [APPLICATION NOTE]
42025D−SAM4L−11/2013
9
4.3
Low Frequency External Clock Source
Figure 4-3. Low Frequency External Clock Source Schematic.
Table 4-3.
4.4
Low Frequency External Clock Source Checklist.
Signal name
Recommended pin connection
Description
XIN32
Connected to clock output from
external clock source
Up to VDDANA volt square wave signal.
Input frequency up to 6MHz.
XOUT32
Must be left unconnected
32kHz Crystal Oscillator
Figure 4-4. 32kHz Crystal Oscillator Example Schematic.
XIN32
15pF
32 kHz
XOUT32
15pF
Table 4-4.
32kHz Crystal Oscillator Checklist.
Signal name
Notes:
Recommended pin connection
(1)
XIN32
Biasing capacitor 15pF
XOUT32
Biasing capacitor 15pF (1)
1.
Description
32.768kHz external crystal powered by VDDANA.
The crystal and capacitors should be located close to the
device to minimize noise emission and improve immunity.
Powered by VDDANA.
These values are given only as a typical example and depend on the crystal parameters, PCB tracks
capacitance and MCU package. To determine the suitable value for the application, refer to the “Electrical
characteristics” section of the datasheet.
Atmel AT01777: SAM4L Schematic Checklist [APPLICATION NOTE]
42025D−SAM4L−11/2013
10
5.
Capacitive Touch (CATB) Module
The CATB can operate in single-ended or differential mode.
Figure 5-1. QTouch Single Ended Schematic.
SENSE k
SENSE m
DIS
Table 5-1.
QTouch Single Ended Checklist.
Signal name
Recommended pin connection
Description
SENSEx
Low capacitance track to sensor
Connect a discharge resistor to DIS pin of the device
Capacitive touch sensor connection.
DIS
Resistor connected to each sensor line
Common discharge pin.
Figure 5-2. QTouch Differential Schematic.
SENSE m
SENSE m+1
Table 5-2.
QTouch Differential Mode Checklist.
Signal name
Recommended pin connection
Description
SENSE m
Connect directly to the first part of the differential
capacitive touch sensor
Capacitive touch sensor connection.
SENSE m+1
Connect directly to the second part of the differential
capacitive touch sensor
Capacitive touch sensor connection.
Atmel AT01777: SAM4L Schematic Checklist [APPLICATION NOTE]
42025D−SAM4L−11/2013
11
6.
USB Connection
To be able to use the USB I/O, the VDDIN power supply must be 3.3V nominal.
6.1
Not Used
If the USB interface is not used, D+ and D- are available for application and behave as standard GPIOs but their
electrical characteristics are different than the standard I/Os. Refer to the electrical characteristics section of the
datasheet.
6.2
Device Mode, Powered from Bus Connection
Figure 6-1. USB in Device Mode, Bus Powered Connection Example Schematic.
Atmel AT01777: SAM4L Schematic Checklist [APPLICATION NOTE]
42025D−SAM4L−11/2013
12
Figure 6-2. USB in Device Mode, Self Powered Connection Example Schematic.
Table 6-1.
Notes:
USB Connection Checklist.
Item
Recommended pin connection
Description
VBUS
Voltage divider to convert 5V VBUS
to 3.3V input compatible level
Depending on the application, detecting VBUS level may be
required to perform specific actions.
D+ and D-
USB signals impedance
PCB traces for USB signals must have specific impedance:
- 45Ω single ended
- 90Ω differential
Refer to the USB specification for more details
D+ and D-
39Ω (1) series resistor placed as
close as possible to the device pin.
USB signal lines.
Crystal
XTAL or external digital clock input:
Typical frequencies (1):
6MHz ±2500ppm
7.3728MHz ±900ppm
8MHz ±2500ppm
12MHz ±2500ppm
14.7456MHz ±900ppm
16MHz ±2500ppm
24MHz ±2500ppm
USB module requires a specific clock input. Refer to the device
datasheet for details.
1.
These values are given only as a typical example.
Atmel AT01777: SAM4L Schematic Checklist [APPLICATION NOTE]
42025D−SAM4L−11/2013
13
7.
Segment LCD Schematics
ATSAM4L features a 4x40 segment LCD controller with character mapping.
LCD controller requires some external components for operation.
Character mapping and autonomous animation requires specific allocation of the LCD screen segment and common
terminals. Refer to the LCD controller section of the datasheet.
7.1
LCD Voltage Pump Schematic
Figure 7-1. LCD Bias Voltage Generation Schematic.
Table 7-1.
Internal Bias Voltage Generation Checklist.
Signal name
Notes:
Recommended pin connection
(1)(2)
Description
CAPH and
CAPL
Connect a 100nF
capacitor
from CAPH to CAPL
Charge pump capacitor.
VLCD
Connect a 100nF (1)(2) capacitor
from VLCD to GND
LCD controller decoupling.
BIAS2
Connect a 100nF (1)(2) capacitor
from BIAS2 to GND
LCD bias voltage filtering.
BIAS1
Connect a 100nF (1)(2) capacitor
from BIAS1 to GND
LCD bias voltage filtering.
1.
These values are given only as a typical example.
2.
Capacitor should be placed as close as possible to each pin in the signal group, vias should be avoided.
Atmel AT01777: SAM4L Schematic Checklist [APPLICATION NOTE]
42025D−SAM4L−11/2013
14
7.2
When not Using the LCD
If, for some reason, the LCD controller is not used at all, the LCD power pins should be connected this way:
Table 7-2.
Notes:
Checklist When Not Using the LCD Controller.
Signal name
Recommended pin connection
Description
CAPH and
CAPL
Connect CAPH & CAPL together
but not to GND
Avoids current consumption of undriven input
VLCD
Connect to VDDIO
LCDA Cluster GPIO pins power supply (1)
BIAS1 and
BIAS2
Connect BIAS1 & BIAS2 together
but not to GND
Avoids current consumption of undriven input
1.
Refer to the “LCD power modes” section of the device datasheet.
Atmel AT01777: SAM4L Schematic Checklist [APPLICATION NOTE]
42025D−SAM4L−11/2013
15
8.
Debug and Programming
There are two standard debug interfaces connectors for ARM® devices:
•
•
8.1
20-pin legacy connector:
•
Supported by most available ARM debug interfaces
•
Robust
10-pin Cortex™ debug connector
•
New standard
•
Reduced board area
JTAG Port Interface
Figure 8-1. JTAG 20-pins Debug Port Schematic.
Atmel AT01777: SAM4L Schematic Checklist [APPLICATION NOTE]
42025D−SAM4L−11/2013
16
Figure 8-2. JTAG 10-pins Debug Port Schematic.
VDD
100k
Cortex Debug Connector
(1.27mm) .050"
VDD
1
VCC
3
100nF
5
7
GND
SWDCLK /TCK
GND
SWO/TDO
KEY
9
Table 8-1.
NC/TDI
GNDDetect
nRESET
4
100k
TCK
6
RESET
8
VDD
10
Recommended pin connection
(1)
Connect to debugger connector
100k Pull-up to VDDIN
TDO/PA23 (1)
Connect to debugger connector
TMS/PA03
TDI/PA24
(1)
100k
TDI
Description
Connect to debugger connector
100k Pull-up to VDDIN
TCK
Connect to debugger connector
100k Pull-up to VDDIN
RESET
Connect to debugger connector
1.
TDO
VDD
JTAG Debug Port Checklist.
Signal name
Notes:
SWDIO/TMS
2
TMS
These pins may be used by the application but will be unavailable when debugging: If the JTAG is enabled,
the JTAG will take control over a number of pins, irrespectively of the I/O Controller configuration.
Atmel AT01777: SAM4L Schematic Checklist [APPLICATION NOTE]
42025D−SAM4L−11/2013
17
8.2
SWD Port Interface
Serial wire debug use less pins than JTAG debug interface.
Figure 8-3. SWD 20-pins Legacy Debug Port Schematic.
20 pins Legacy Debug
Connector
(2.54mm) .100"
VDD
VDD
100k
100k
VDD
100nF
1
3
5
7
9
11
13
15
17
19
VCC
VCC(optional)
TRST
GND
NC/TDI
GND
SWDIO/TMS
GND
SWDCLK/TCK
GND
RTCK
GND
SWO/TDO
GND
nRESET
GND
NC/DBGRQ
GND
NC/DBACK
GND
2
4
TMS
TDO/SWO
(Optionnal serial trace output)
TCK
6
8
RESET
10
12
TDI/PA24
(Available for application)
14
16
18
20
Atmel AT01777: SAM4L Schematic Checklist [APPLICATION NOTE]
42025D−SAM4L−11/2013
18
Figure 8-4. SWD 10-pins Debug Port Schematic.
VDD
100k
Cortex Debug Connector
(1.27mm) .050 "
VDD
1
3
100nF
5
7
9
Table 8-2.
VCC
GND
SWDCLK/TCK
GND
SWO/TDO
KEY
NC/TDI
GNDDetect
nRESET
TDO/SWO
(Optional serial trace output )
VDD
4
100k
TCK
6
RESET
8
10
TDI/PA24
(Available for application)
SWD Debug Port Checklist.
Signal name
Recommended pin connection
Description
Connect to debugger connector
100k Pull-up to VDDIN
SWDIO
TDO/PA23 (1)
Optionally connect to debugger
connector if serial trace is needed
SWO
If serial trace is enabled, trace will take control of this pin
irrespectively of the I/O Controller configuration.
TDI/PA24 (1)
No connection needed
Available for application
TCK
Connect to debugger connector
100k Pull-up to VDDIN
RESET
Connect to debugger connector
TMS/PA03
Notes:
SWDIO/TMS
2
TMS
1.
(1)
SWDCLK
These pins may be used by the application but will be unavailable when debugging: If the SWD is enabled,
the SWD will take control over a number of pins, irrespectively of the I/O Controller configuration.
Atmel AT01777: SAM4L Schematic Checklist [APPLICATION NOTE]
42025D−SAM4L−11/2013
19
9.
Miscellaneous Topics
9.1
SAM-BA Bootloader Hardware Requirements
The SAM-BA® Boot Assistant supports serial communication via the UART or USB device port:
Table 9-1.
Notes:
UART Mode Requirements Checklist.
Signal name
Recommended pin connection
Description
PA05
Connect to host
USART0 RXD pin.
PA07
Connect to host
USART0 TXD pin.
Hardware
Bootloader
Entry
(Any GPIO)
Connect to host
Optional pin to force bootloader entry on reset. If enabled, the
bootloader will check the GPIO on reset to determine if the
bootloader monitor shall start. This feature allows the end user
to reprogram the device even if the application is corrupted or
unable to start the SAM-BA monitor.
This GPIO number and its active level are defined in the flash
user page. The SAM-BA application can be used to program it.
Note: The bootloader won’t pull up or pull down the pin, the
level has to set externally.
1.
Table 9-2.
These values are given only as a typical example.
USB Mode Requirements Checklist.
Signal name
Recommended pin connection
Description
D+
Connect to host
USB D+ pin
D-
Connect to host
USB D- pin
Hardware
Bootloader
Entry
(Any GPIO)
Connect to host
Optional pin to force bootloader entry on reset. If enabled, the
bootloader will check the GPIO on reset to determine if the
bootloader monitor shall start. This feature allows the end user
to reprogram the device even if the application is corrupted or
unable to start the SAM-BA monitor.
This GPIO number and its active level are defined in the flash
user page. The SAM-BA application can be used to program it.
Note: The bootloader won’t pull up or pull down the pin, the
level has to set externally.
XIN / XOUT
XTAL or external digital clock
input : Supported frequencies:
6MHz ±2500ppm
7.3728MHz ±900ppm
8MHz ±2500ppm
12MHz ±2500ppm
14.7456 MHz ±900ppm
16MHz ±2500ppm
24MHz ±2500ppm
Clock input for PLL used for USB clock source.
Atmel AT01777: SAM4L Schematic Checklist [APPLICATION NOTE]
42025D−SAM4L−11/2013
20
9.2
Low Power Design
In order to minimize power consumption the following checklist should be followed:
Table 9-3.
Low Power Design Checklist.
Item
Recommendations
Any I/O
Avoid mid-level voltages on digital inputs (analog inputs excluded). The voltage placed on the
input shall be as close as possible to VDD or GND.
Beware of any external component connected to MCU but powered by another supply domain (ex:
5V sensor connected to SAM4L using 3.3V VDDIN).
Unconnected
pins
To reduce power consumption, unused I/O pins should be made stable by either:
Setting I/O as input with internal pull-up enabled.
Setting I/O as output and driven at ‘0’ with internal pull-up disabled.
Oscillators
Avoid driving high capacitance lines at high frequencies by ensuring minimum track length.
Regulator Mode
The regulator has an impact on power consumption. Refer to 1.1 Choosing the right regulator
mode for the application to choose the suitable regulator mode.
Communications
Avoid software emulation for communications, hardware driven use less CPU and complete
communications quicker allowing the CPU to go back to sleep sooner.
Some hardware peripherals also allow the use of SleepWalking to perform actions without CPU
intervention.
Atmel AT01777: SAM4L Schematic Checklist [APPLICATION NOTE]
42025D−SAM4L−11/2013
21
10.
Suggested Reading
10.1
Device Datasheet
The device datasheet contains block diagrams of the peripherals and details about implementing firmware for the
device. It also contains the electrical specifications and expected characteristics of the device.
The datasheet is available on http://www.atmel.com/ in the Datasheets section of the product page.
10.2
Evaluation Kit User Guide
The SAM4L-EK user guide contains schematics that can be used as a starting point when designing with the SAM4L
devices. This user guide is available on http://www.atmel.com/ in the documents section of the SAM4L-EK page.
The SAM4L Xplained Pro user guide contains the details about pin assignment of the extension interfaces on the board
and other hardware information. This user guide is available on http://www.atmel.com/ in the documents section of the
SAM4L Xplained Pro page.
10.3
USB Specification
The Universal Serial Bus specification is available from http://www.usb.org.
10.4
ARM Documentation on Cortex-M4 core
•
•
Cortex-M4 Devices Generic User Guide for revision r0p1
Cortex-M4 Technical Reference Manual for revision r0p1
These documents are available at http://www.arm.com/ in the info center section.
Atmel AT01777: SAM4L Schematic Checklist [APPLICATION NOTE]
42025D−SAM4L−11/2013
22
11.
Revision history
Doc. Rev.
Date
42025D
11/2013
42025C
06/2013
Comments
•
Table 7-2 updated. Checklist when not using the LCD controller
•
Typos fixed
•
Tables and headings updated according to template
•
Renamed from “AVR4035: SAM4L Schematic Checklist” to
“AT01777: SAM4L Schematic Checklist”
•
Changed section 1 and section 7, on LCD clusters supply
•
Added SAM4L Xplained Pro information
42025B
10/2012
•
Changed USART2 to USART0 in SAM-BA Bootloader hardware requirements
42025A
09/2012
•
Initial document release
Atmel AT01777: SAM4L Schematic Checklist [APPLICATION NOTE]
42025D−SAM4L−11/2013
23
Atmel Corporation
Atmel Asia Limited
Atmel Munich GmbH
Atmel Japan G.K.
1600 Technology Drive
Unit 01-5 & 16, 19F
Business Campus
16F Shin-Osaki Kangyo Building
San Jose, CA 95110
BEA Tower, Millennium City 5
Parkring 4
1-6-4 Osaki
USA
418 Kwun Tong Road
D-85748 Garching b. Munich
Shinagawa-ku, Tokyo 141-0032
Tel: (+1)(408) 441-0311
Kwun Tong, Kowloon
GERMANY
JAPAN
Fax: (+1)(408) 487-2600
HONG KONG
Tel: (+49) 89-31970-0
Tel: (+81)(3) 6417-0300
www.atmel.com
Tel: (+852) 2245-6100
Fax: (+49) 89-3194621
Fax: (+81)(3) 6417-0370
Fax: (+852) 2722-1369
© 2013 Atmel Corporation. All rights reserved. / Rev.: 42025D−SAM4L−11/2013
Atmel®, Atmel logo and combinations thereof, AVR®, Enabling Unlimited Possibilities®, SAM-BA®, QTouch®, and others are registered trademarks or trademarks
of Atmel Corporation or its subsidiaries. ARM® and Cortex® are registered trademarks of ARM Ltd. Other terms and product names may be trademarks of others.
Disclaimer: The information in this document is provided in connection with Atmel products. No license, express or implied, by estoppel or otherwise, to any intellectual property right is granted by this
document or in connection with the sale of Atmel products. EXCEPT AS SET FORTH IN THE ATMEL TERMS AND CONDITIONS OF SALES LOCATED ON THE ATMEL WEBSITE, ATMEL ASSUMES
NO LIABILITY WHATSOEVER AND DISCLAIMS ANY EXPRESS, IMPLIED OR STATUTORY WARRANTY RELATING TO ITS PRODUCTS INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
CONSEQUENTIAL, PUNITIVE, SPECIAL OR INCIDENTAL DAMAGES (INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS AND PROFITS, BUSINESS INTERRUPTION, OR LOSS OF
INFORMATION) ARISING OUT OF THE USE OR INABILITY TO USE THIS DOCUMENT, EVEN IF ATMEL HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. Atmel makes no
representations or warranties with respect to the accuracy or completeness of the contents of this document and reserves the right to make changes to specifications and products descriptions at any time
without notice. Atmel does not make any commitment to update the information contained herein. Unless specifically provided otherwise, Atmel products are not suitable for, and shall not be used in,
automotive applications. Atmel products are not intended, authorized, or warranted for use as components in applications intended to support or sustain life.