Scheda basata sul microcontrollore Atmel SAMD21 MCU con Core a 32 bit ARM Cortex® M0 e sul processore MIPS Qualcomm Atheros AR9342 che supporta il Linino OS e integra un modulo WiFi dual band; la scheda dispone di una memoria eMMC da 4GB.
I pacchi sono solitamente spediti entro 2 giorni dopo il ricevimento del pagamento e inviati tramite SDA. Ti garantiremo un link per controllare online il percorso del tuo pacco.
E' possibile il reso secondo le norme vigenti, ma sempre dopo averne concordate le modalità con l'amministrazione. Spedizioni non preventivamente autorizzate saranno rispedite al mittente.
|Flash Memory||16MB + 4GB eMMC|
|Clock Speed||560 MHz|
|WiFi||802.11 b/g/n 2.4 GHz dual-band|
|Ethernet||802.3 10/100/1000 Mbit/s|
|Flash Memory||256 KB|
|Clock Speed||48 MHz|
|Analog I/O Pins||6|
|DC Current per I/O Pins||7mA (I/O Pins)|
|Input Voltage||5 V|
|Power Consumption||470 mA|
|PCB Size||53 x 68.5 mm|
|Bluetooth||CSR8510, Bluetooth with EDR / BLE 4.0|
The Arduino Tian can be powered via the micro USB connection or with an external power supply. The power source is selected automatically. External (non-USB) power can come either from an AC-to-DC adapter (wall-wart) or a battery inserted in the Gnd and Vin pin headers. The board will automatically detect which power sources are available and choose which one to use according to the following priority:
- External power
- Target USB
External power required is of 600mA and 5V. The power pins are as follows:
- VIN. The input voltage to the Arduino board when it's using an external power source. You can supply voltage through this pin. The allowed input voltage range for this pin 5V.
- 5V. The regulated power supply used to power the microcontroller and other components on the board. This can come either from VIN via an on-board regulator, or be supplied by USB or another regulated 5V supply. The maximum current output provided by the on-board regulator is 2A (according to the power input source). 3V3. A 3.3 volt supply generated by the on-board regulator. Maximum current draw is 2A (according to the power input source).
- GND. Ground pins.
- IOREF. The voltage at which the i/o pins of the board are operating (i.e. VCC for the board). This is 3.3V on the Tian.
The ATSAMD21G18 has 256 KB of flash program memory (with 69 KB used for the bootloader). The bootloader is factory pre burnt by Atmel and is stored in a dedicated ROM memory. The bootloader is protected using the NVM fuse. It also carries 32 KB of SRAM.
Input and Output
It is not possible to access the I/O pins of the Atheros AR9342. All I/O lines are tied to the Atmel SAMD21. The Atheros is connected a usb hub with 4 ports (see the block diagram) to which are connected the Bluetooth, memory eMMCs, the SAMD21 and the USB Host port.
Each of the 20 digital i/o pins on the Tian can be used as an input or output, using pinMode(), digitalWrite(), and digitalRead() functions. They operate at 3.3 volts. Each pin can provide or receive a maximum of 40 mA and has an internal pull-up resistor (disconnected by default) of 20-50 kOhms. In addition, some pins have specialized functions:
- Serial: 0 (RX) and 1 (TX). Used to receive (RX) and transmit (TX) 3.3V serial data using the Atmel SAMD21 hardware serial capability. Note that on the Tian, the Serial class refers to USB (CDC) communication; for 3.3V serial on pins 0 and 1, use the Serial5 class. The hardware serials of the Atmel SAMD21 and the AR9342 on the Tian are connected together and are used to communicate between the two processors via SerialUSB.
- TWI: SDA and SCL support TWI communication using the Wire library. Note that the TWI pins are not connected to any of the digital I/O pins.
- External Interrupts: all pins can be external interrupt except pin2: 0 (interrupt 0), 1 (interrupt 1), …. These pins can be configured to trigger an interrupt on a low value, a rising or falling edge, or a change in value. See the attachInterrupt() function for details. Pin 7 is connected to the AR9342 processor and it may be used as handshake signal in future. Is recommended to be careful of possible conflicts if you intend to use it as interrupt.
- LINUX (MIPS) on/off: it possible turn on/off the Linux side via pin32 ( digitalWrite(32, HIGH) - digitalWrite(32, LOW) ).
- PWM: From pins 2 to 13 provide 8-bit PWM output with the analogWrite() function. The resolution of the PWM can be changed with the analogWriteResolution() function. Note: The pins 4 and 10 can not be used simultaneously as PWM. Note: The pins 5 and 12 can not be used simultaneously as PWM.
- SPI: on the ICSP header. These pins support SPI communication using the SPI library. Note that the SPI pins are not connected to any of the digital I/O pins as they are on the Uno, They are only available on the ICSP connector. This means that if you have a shield that uses SPI, but does NOT have a 6-pin ICSP connector that connects to the Tian's 6-pin ICSP header, the shield will not work.
- LED: 13. There is a built-in LED connected to digital pin 13. When the pin is HIGH value, the LED is on, when the pin is LOW, it's off. There are several other status LEDs on the Tian, indicating power, WLAN connection, WAN connection, Bluetooth and USB.
- Analog Inputs: A0 - A5, A6 - A11 (on digital pins 4, 6, 8, 9, 10, and 12). The Tian has 12 analog inputs, labeled A0 through A11, all of which can also be used as digital i/o. Pins A0-A5 appear in the same locations as on the Uno; inputs A6-A11 are on digital i/o pins 4, 6, 8, 9, 10, and 12 respectively. Each analog input provide 10 bits of resolution (i.e. 1024 different values). By default the analog inputs measure from ground to 5 volts, though is it possible to change the upper end of their range using the AREF pin and the analogReference() function.
- AREF. Reference voltage for the analog inputs. Used with analogReference().
- 10-bit DAC is on pin A0 and can be used with the analogWrite() function
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