ARDUINO MKR ZERO (I2S BUS &
S D F O R S O U N D, M U S I C & D I G I TA L
AU D I O DATA )
Code: ABX00012
MKR ZERO has an on‐board SD connector with dedicated SPI
interfaces (SPI1) that allows you to play with MUSIC files with no
extra hardware!
Watch out music makers, we’ve got some news for you! We have
released two libraries for your enjoyment:
Arduino Sound library – a simple way to play and analyze audio data
using Arduino on SAM D21‐based boards.
https://arduino.cc/en/Reference/ArduinoSound
I2S library – to use the I2S protocol on SAMD21‐based boards. For
those who don’t know, I2S (Inter‐IC Sound) is an electrical serial bus
interface standard for connecting digital audio devices.
https://arduino.cc/en/Reference/I2S
The MKR ZERO brings you the power of a Zero in the smaller format established by
the MKR form factor. The MKR ZERO board acts as a great educational tool for
learning about 32‐bit application development. It has an on‐board SD connector
with dedicated SPI interfaces (SPI1) that allows you to play with MUSIC files with
no extra hardware! The board is powered by Atmel’s SAMD21 MCU, which
features a 32‐bit ARM Cortex® M0+ core.
Warning: Unlike most Arduino & Genuino boards, the MKRZero runs at 3.3V. The
maximum voltage that the I/O pins can tolerate is 3.3V. Applying voltages higher
than 3.3V to any I/O pin could damage the board.
The board contains everything needed to support the microcontroller; simply
connect it to a computer with a micro‐USB cable or power it by a LiPo battery. The
battery voltage can also be monitored since a connection between the battery and
the analog converter of the board exists.
TECH SPECS
Microcontroller
Board Power Supply (USB/VIN)
Supported Battery(*)
DC Current for 3.3V Pin
DC Current for 5V Pin
Circuit Operating Voltage
Digital I/O Pins
PWM Pins
UART
SPI
I2C
Analog Input Pins
Analog Output Pins
External Interrupts
DC Current per I/O Pin
Flash Memory
Flash Memory for Bootloader
SRAM
EEPROM
Clock Speed
LED_BUILTIN
Full‐Speed USB Device and embedded
Host
SAMD21 Cortex‐M0+ 32bit low power ARM
MCU
5V
Li‐Po single cell, 3.7V, 700mAh minimum
600mA
600mA
3.3V
22
12 (0, 1, 2, 3, 4, 5, 6, 7, 8, 10, A3 ‐ or 18 ‐,
A4 ‐or 19)
1
1
1
7 (ADC 8/10/12 bit)
1 (DAC 10 bit)
8 (0, 1, 4, 5, 6, 7, 8, A1 ‐or 16‐, A2 ‐ or 17)
7 mA
256 KB
8 KB
32 KB
no
32.768 kHz (RTC), 48 MHz
32
OSH: Schematics
The MKR ZERO is open‐source hardware! You can build your own board using the
following files:
EAGLE FILES IN .ZIP
https://www.arduino.cc/en/uploads/Main/ArduinoMKRZero‐reference.zip
SCHEMATICS IN .PDF
https://www.arduino.cc/en/uploads/Main/ArduinoMKRZero‐schematic.pdf
Li‐Po batteries, Pins, SD and board LEDs
On‐board SD
The on‐ board SD connector allows you to play with files without adding any extra
hardware to the board. Furthermore SD card is driven by a dedicated SPI interface
(SPI1) and so any of the pins of the header is busy during SD usage. The SD library
automatically recognizes the MKR ZERO and so any modification to the sketch is
needed to use it aprat from choosing the right SS pin (SDCARD_SS_PIN).
Battery capacity
Li‐Po batteries are charged up to 4,2V with a current that is usually half of the
nominal capacity (C/2). For Arduino MKR ZERO we use a specialized chip that has a
preset charging current of 350mAh. This means that the MINIMUM capacity of the
Li‐Po battery should be 700 mAh. Smaller cells will be damaged by this current and
may overheat, develop internal gasses and explode, setting on fire the
surroundings. We strongly recommend that you select a Li‐Po battery of at least
700mAh capacity. A bigger cell will take more time to charge, but won't be harmed
or overheated. The chip is programmed with 4 hours of charging time, then it goes
into automatic sleep mode. This will limit the amount of charge to max 1400 mAh
per charging round.
Battery connector
If you want to connect a battery to your MKRZero be sure to search one with
female 2 pin JST PHR2 Type connector. Polarity : looking at the board connector
pins, polarity is Left = Positive, Right = GND Connector datasheet On the
MKRZero, connector is a Male 2pin JST PH Type
http://www.jst‐mfg.com/product/pdf/eng/ePH.pdf
Additional I2C Port
The MKRZero has an additional connector meant as an extension of the I2C bus.
It's a small form factor 5‐pin connector with 1.0mm pitch. The mechanical details
of the connector can be found in the connector datasheet. The I2C port in addition
to the SDA and SCL signals includes the GND and +5V power rails and a digital pin
that might be useful when designing an expansion. The pinout is shown in the
following image:
http://www.jst‐mfg.com/product/pdf/eng/eSH.pdf
Vin
This pin can be used to power the board with a regulated 5V source. If the power is
fed through this pin, the USB power source is disconnected. This is the only way
you can supply 5v (range is 5V to maximum 6V) to the board not using USB. This
pin is an INPUT.
5V
This pin outputs 5V from the the board when powered from the USB connector or
from the VIN pin of the board. It is unregulated and the voltage is taken directly
from the inputs. As an OUTPUT, it should not be used as an input pin to power the
board.
VCC
This pin outputs 3.3V through the on‐board voltage regulator. This voltage is the
same regardless the power source used (USB, Vin and Battery).
LED ON
This LED is connected to the 5V input from either USB or VIN. It is not connected to
the battery power. This means that it lits up when power is from USB or VIN, but
stays off when the board is running on battery power. This maximizes the usage of
the energy stored in the battery. It is therefore normal to have the board properly
running on battery power without the LED ON being lit.
CHARGE LED
The CHARGE LED on the board is driven by the charger chip that monitors the
current drawn by the Li‐Po battery while charging. Usually it will lit up when the
board gets 5V from VIN or USB and the chip starts charging the Li‐Po battery
connected to the JST connector. There are several occasions where this LED will
start to blink at a frequency of about 2Hz. This flashing is caused by the following
conditions maintained for a long time (from 20 to 70 minutes): ‐ No battery is
connected to JST connector. ‐ Overdischarged/damaged battery is connected. It
can't be recharged. ‐ A fully charged battery is put through another unnecessary
charging cycle. This is done disconnecting and reconnecting either VIN or the
battery itself while VIN is connected.
Onboard LED
On MKR ZERO the onboard LED is connected to a dedicated pin (32) and not to 13
as on other boards. It is so suggested to use the LED_BUILTIN define .
(*) Note : DO NOT CONNECT to the male JST connector present on the board
anything else than a Li‐Po battery whose characteristics are compliant with those
indicated above. Please DO NOT POWER VIN with more than 5V.
https://store.arduino.cc/usa/arduino‐mkrzero 12‐7‐17
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