MattairTech MT--D21E User manual

MT-D21E User Guide
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MT-D21E User uide
Table of Contents
Table of Contents
Overview........................................................................................................................4
Introduction.......................................................................................................................................4
Board Features.................................................................................................................................5
ATSAMD21ExxA Features................................................................................................................6
MT-D21E Hardware.......................................................................................................7
Top View / Pinout..............................................................................................................................7
Main Header Pins (Power)................................................................................................................8
Main Header Pins (Signal)................................................................................................................9
Solder Jumpers...............................................................................................................................11
MattairTech Arduino SAMD Core..............................................................................13
What's New (1.6.6-mt1, November 24, 2015)..................................................................................13
Summary.........................................................................................................................................14
Special Notes..................................................................................................................................15
Pin Configurations...........................................................................................................................16
Pin Capabilities...............................................................................................................................17
MT-D21E and MT-D11 Board Configuration...................................................................................18
Serial Monitor..................................................................................................................................19
Code Size and RAM Usage (1.6.5-mt2)..........................................................................................19
Detailed Memory Usage Output After Compilation..............................................................................20
Installation.......................................................................................................................................21
Driver Installation..................................................................................................................................21
SAMD Core Installation........................................................................................................................22
New PinDescription Table...............................................................................................................22
Possible Future Additions................................................................................................................24
ChangeLog.....................................................................................................................................24
SAM-BA USB CDC Bootloader (Arduino Compatible)............................................26
Bootloader Firmware Installation.....................................................................................................27
Bootloader Installation Using the Arduino IDE................................................................................27
Bootloader Installation Using Another Tool (ie: Atmel Studio, openocd)........................................27
Using Bossac Standalone...............................................................................................................28
USB Mass Storage Bootloader..................................................................................29
Schematic....................................................................................................................31
Fuse and Lock Settings.............................................................................................32
Blink Demo..................................................................................................................32
Troubleshooting / FAQ...............................................................................................33
Support Information..................................................................................................33
Legal.............................................................................................................................34
Appendix A: Precautions...........................................................................................38
Appendix B: Other MattairTech Products................................................................39
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Overview
Overview
Introduction
The MT-D21E is a development board for the 32-pin Atmel SAM D21E ARM Cortex M0+ USB
microcontroller. It can be powered from USB or from the Vin pin. Two schottky diodes facilitate simple
switching (and reverse-polarity protection) between the two power sources. This voltage is regulated
to 3.3V by the onboard 250mA, extremely low quiescent current (2uA) LDO regulator that supports up
to 16V DC input voltage. Overcurrent protection is provided by a 180mA hold (400mA trip) PTC
resettable fuse. Also mounted is a mini USB connector, blue LED, 16MHz crystal, 32.768KHz crystal,
and two buttons. A USB CDC bootloader (Atmel SAM-BA) can be pre-installed for device
programming without an external programmer. It is compatible with Arduino, and core files are
provided to support Arduino 1.6.5+. A USB Mass Storage Class bootloader can optionally be installed
for device programming (see caveats). The Cortex debug header (10-pin, 50-mil) can be used with an
external debugger/programmer. The board has 40 main dual inline header pins with 100 mil pin
spacing and 700 mil row spacing which allows for mounting on a breadboard or perfboard. There are 2
3mm mounting holes. The PCB measures approx. 2.1” x 0.9” x 0.062” (52mm x 23mm x 1.6mm).
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MT-D21E User uide
Board Features
●Atmel SAM D21E 32-pin ARM Cortex M0+ microcontroller
●ATSAMD21E17A (128KB) or ATSAMD21E18A (256KB)
●Up to 48MHz
●128KB or 256KB in-system self-programmable Flash
●16KB or 32KB SRAM Memory
●Onboard 3.3V, 250mA LDO regulator
●up to 16V DC input
●extremely low quiescent current (2.0uA typical)
●low dropout (525mV typical @ 250mA, 725mV max. @ 250mA)
●0.4% output tolerance typical
●Over-current and over-temperature protection
●Simple power source switching
●2 schottky barrier diodes (Vbus and Vin)
●Low voltage drop
●Reverse-polarity protection
●PTC resettable fuse (180mA hold / 400mA trip)
●Cortex Debug Header (10-pin, 50-mil)
●Can be used for device programming and debugging
●16MHz crystal (can use PLL for up to 48MHz cpu clock)
●32.768KHz crystal
●Blue Status LED (can be disconnected)
●Button A for general use (pin A27) with debouncing
●Button B configurable for reset or general use (pin A31) with debouncing
●Two 4.7Kohm resistors can be connected to pins A16 and A17 for use with I2C
●USB SAM-BA (CDC) bootloader (optional)
●Arduino compatible (use the Arduino IDE to upload)
●Bossa command line utility (Windows, Linux, limited OS X)
●Arduino 1.6.5+ compatible core (1.6.6 support now available)
●USB Mass Storage Device (MSD) bootloader (optional, see caveats)
●Mini USB connector
●ESD protection on USB D+ and D- lines
●USB pins routed to header pins (for panel-mount USB connector)
●Powered by USB or external power source (up to 16V) on Vin
●Ferrite bead and 2 capacitors on analog supply
●Two capacitors each can be enabled for pins A3 and/or A4 for use with external references
●19 solder jumpers on PCB bottom for configuration flexibility
●All PORT pins routed to headers
●2 main headers are on 0.1” spacing (breadboard/perfboard mounting)
●Two 3mm mounting holes (~5mm pad)
●High-quality PCB with gold-plated finish
●Measures approx. 2.1” x 0.9” (52mm x 23mm) and 0.062” (1.6mm) thick.
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MT-D21E User uide
ATSAMD21ExxA Features
●Processor
●ARM Cortex-M0+ CPU running at up to 48MHz
●Single-cycle hard are multiplier
●Micro Trace Bu$er
●Memories
●32/64/128/256KB in-system self-programmable Flash
●4/8/16/32KB SRAM Memory
●System
●Po er-on reset (POR) and bro n-out detection (BOD)
●Internal and external clock options ith 48MHz Digital Frequency Locked Loop (DFLL48M) and 48MHz to
96MHz Fractional Digital Phase Locked Loop (FDPLL96M)
●External Interrupt Controller (EIC) / One non-maskable interrupt
●16 external interrupts
●T o-pin Serial Wire Debug (SWD) programming, test and debugging interface
●Low Power
●Idle and standby sleep modes
●SleepWalking peripherals
●Peripherals
●12-channel Direct Memory Access Controller (DMAC)
●12-channel Event System
●Up to ve 16-bit Timer/Counters TC), congurable as either:
●One 16-bit TC ith compare/capture channels
●One 8-bit TC ith compare/capture channels
●One 32-bit TC ith compare/capture channels, by using t o TCs
●Three 24-bit Timer/Counters for Control TCC), with extended functions:
●Up to four compare channels ith optional complementary output
●Generation of synchronized pulse idth modulation (PWM) pattern across port pins
●Deterministic fault protection, fast decay and con>gurable dead-time (complementary outputs)
●Dithering that increase resolution ith up to 5 bit and reduce quantization error
●32-bit Real Time Counter RTC) with clock/calendar function
●Watchdog Timer (WDT)
●CRC-32 generator
●One full-speed 12Mbps) Universal Serial Bus USB) 2.0 interface
●Embedded host and device function
●Eight endpoints
●Up to six Serial Communication Interfaces SERCOM), each congurable to operate as either:
●USART ith full-duplex and single- ire half-duplex con>guration
●I2C up to 3.4MHz
●SPI
●LIN slave
●One t o-channel Inter-IC Sound (I2S) interface
●One 12-bit, 350ksps Analog-to-Digital Converter ADC) with up to 20 channels
●Di$erential and single-ended input
●1/2x to 16x programmable gain stage
●Automatic o$set and gain error compensation
●Oversampling and decimation in hard are to support 13-, 14-, 15- or 16-bit resolution
●10-bit, 350ksps Digital-to-Analog Converter DAC)
●T o Analog Comparators (AC) ith indo compare function
●Peripheral Touch Controller (PTC)
●I/O
●Up to 52 programmable I/O pins
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MT-D21E Hardware
MT-D21E Hardware
Top View / Pinout
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MT-D21E User uide
============================= MattairTech MT-D21E (ATsamd21eXXa) ========================
Other INT PWM Digital Anal g Digital PWM INT Other
=========================================================================================
-------------------
Xin32 | A0 RST | Reset
X ut32 | A1 NC |
DAC 2 2(ADC0) | A2 NC |
REF 3 3(ADC1) | A3 A31 | 31 31(TCC11) 31(INT11) SWDIO*
4(INT4) 4 4(ADC4) | A4 A30 | 30 30(TCC10) 30(INT10) SWDCLK
5(INT5) 5 5(ADC5) | A5 NC |
6 6(ADC6) | A6 A28 | 28 28(INT8) LED
VDIV 7 7(ADC7) | A7 A27 | 27 27(INT15) BTNA
8(INTNMI) 8(TCC00) 8 8(ADC16) | A8 A23 | 23 23(TC41) 23(INT7) SS
9(INT9) 9(TCC01) 9 9(ADC17) | A9 A22 | 22 22(TC40) 22(INT6) MISO
TX1 10(TCC02) 10 10(ADC18)| A10 A19 | 19 19(INT3) SCK
RX1 11(TCC03) 11 11(ADC19)| A11 A18 | 18 18(INT2) MOSI
TX2 14(INT14) 14(TC30) 14 | A14 A17 | 17 17(TCC21) 17(INT1) SCL
RX2 15(TC31) 15 | A15 A16 | 16 16(TCC20) 16(INT0) SDA
| NC NC |
| NC NC |
| Vbus 3.3V| * Butt n B available n 31
USB D- | A24- _____ Vcc |
USB D+ | A25+ | | Vin |
| Gnd | USB | Gnd |
-------------------
Main Header Pins (Power)
Pin Description
Gnd (2) Ground
Vbus Vbus is connected directly to the Vbus pin (5V) of the USB connector. It is routed
through a schottky diode and through J6 to the regulator input circuitry, which includes
a 4.7uF capacitor. Vbus voltage can be measured on pin A1 by connecting J12 and
setting J3 toward the Vbus side of the board. J12 will complete the circuit for a resistor
divider consisting of a 200Kohm (top) and a 20Kohm resistor (bottom), and J3
connects to Vbus. The resistor divider will pull pin A7 to near ground level when Vbus
is disconnected. Because of a small leakage current from the schottky diode, a small
voltage should be interpreted as USB disconnected.
Vin Vin is the external power input pin. Up to 16V can be connected. It is routed through a
schottky diode to the regulator input circuitry, which includes a 4.7uF, 25V capacitor.
The schottky diode can be shorted with J1, eliminating the voltage drop across the
diode, which can be useful for battery applications. Note that when the diode is
shorted, reverse-polarity protection is disabled, and J6 should be disconnected to
prevent Vbus current from flowing into Vin. Vin voltage can be measured on pin A1 by
connecting J12 and setting J3 toward the Vin side of the board. J12 will complete the
circuit for a resistor divider consisting of a 200Kohm (top) and a 20Kohm resistor
(bottom), and J3 connects to Vbus. The resistor divider will pull pin A7 to near ground
level when Vbus is disconnected. Because of a small leakage current from the
schottky diode, a small voltage should be interpreted as Vin disconnected.
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Vcc This pin is connected to the Vcc and VccAna (through a ferrite bead) pins on the
microcontroller, the Cortex debug header Vcc pin, the reset pullup, and the TWI pullup
resistors. Vcc is connected to 3.3V through J5, which in turn is connected to the
output of the onboard regulator. The Vcc pin can also be used as an input. Disconnect
J5 to supply power from an external source to the Vcc pin.
3.3V 3.3V is connected to the output of the onboard 3.3V regulator. There is a 10uF
capacitor on the output. 3.3V is normally connected to Vcc through J5.
CAUTION
Higher regulator input voltages mean larger voltage drops and thus higher
thermal dissipation for a given amount of current. Be sure to limit current
consumption to prevent excessive heat when using higher voltages and/or
currents. The regulator will enter thermal shutdown if it gets too hot. All
capacitors are X7R, X7 , or NP0, so they can deal with the higher
temperatures of the regulator. Note that the PTC fuse is located near the
regulator, so high temperatures will lower the PTC trip and hold currents.
Main Header Pins (Signal)
Pin Description
A0, A1 (Xin32, Xout32) These can be used for analog or digital functions. Alternatively, jumpers
J16 and J17 can be set to route A0 and A1 to the 32.768KHz crystal.
A2, A5, A6 These can be used for analog or digital functions. Pin A2 can be used as a
DAC output.
A3, A4 These can be used for analog or digital functions. Alternatively, jumpers
J19 and/or J18 can be set to enable both a 100nF capacitor and a 1uF
capacitor so that the pin can be used with an external voltage reference.
A7 / Voltage Divider This can be used for analog or digital functions. Additionally, this pin can
be connected to the voltage divider for measurement of Vin or Vbus by
setting J3 and J12 appropriately.
A8 - A11 These can be used for analog or digital functions.
A14, A15 (Xin, Xout) These can be used for digital functions. Pin A14 can be used with an
external clock. Alternatively, jumpers J10 and J11 can be set to route A15
and A14 to the 16MHz crystal.
A24-, A25+
(USB D- and D+)
These can be used for digital functions. By default, these pins are also
connected to pins D- and D+ of the USB connector through jumpers J7
and J4. These header pins, along with the adjacent Vbus and Ground pins
can be used for a panel-mount USB connector.
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MT-D21E User uide
A16, A17 (I2C) These can be used for digital functions. Additionally, jumpers J8 and J9
can be enabled, which will connect two 4.7Kohm pullup resistors for use
with I2C.
A18, A19, A22, A23 These can be used for digital functions.
A27 / Button A This can be used for digital functions. By default, this pin is connected to
Button A through jumper J13. This button is debounced using a 249ohm
resistor and a 100nF capacitor. The pin is brought to ground when the
button is pressed. The button is used for bootloader entry (optional) or can
be for general purpose use.
A28 / LED This can be used for digital functions. By default, this pin is connected to a
blue LED through jumper J14 and a 499ohm resistor. The LED circuit
should consume around 1mA. Drive the pin high to turn on the LED.
A30 / SWD CLK This can be used for digital functions. Additionally, this pin is connected to
the Cortex debug header where it is used as SWD CLK.
A31 / Button B / SWD
IO
This can be used for digital functions. Additionally, the pin is routed to the
Cortex debug header where it is used as SWD IO. Alternatively, this pin
can be connected to Button B through jumper J15 (note that this button
can also be used for RST). This button is debounced using a 249ohm
resistor and a 100nF capacitor. The pin is brought to ground when the
button is pressed. The button can be can be for general purpose use.
RST RST connects to the reset pin of the microcontroller, to Button B through
jumper J15 ( note that this button can also be for general purpose use; see
A31 above), and to the Cortex debug header. A 10K pullup resistor is
connected as well.
NC These pins are not connected to anything. There are 7 pins marked NC.
Cortex Debug Header This 10-pin, 50-mil header can be connected to an external
programmer/debugger.
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