MEAM.Design - ItsyBitsy - Board Pinout & Functionality
Pinout of Adafruit ItsyBitsy32u4 5V version
Left Side
RST | Reset | Active low reset (> 400ns pulse to reset) |
5V | 5V | Power from battery regulator 5V or USB through diode ~4.8V |
AREF | AREF | Analog Reference Voltage (input) for the A/D converter |
GND | GND | board ground |
F7 | F7 | GPIO port F, bit 7 |
ADC7 | analog-to-digital converter, channel 7 | |
F6 | F6 | GPIO port F, bit 6 |
ADC6 | analog-to-digital converter, channel 6 | |
F5 | F5 | GPIO port F, bit 5 |
ADC5 | analog-to-digital converter, channel 5 | |
F4 | F4 | GPIO port F, bit 4 |
ADC4 | analog-to-digital converter, channel 4 | |
F1 | F1 | GPIO port F, bit 1 |
ADC1 | analog-to-digital converter, channel 1 | |
F0 | F0 | GPIO port F, bit 0 |
ADC0 | analog-to-digital converter, channel 0 | |
B1 | B1 | GPIO port B, bit 1 |
PCINT1 | pin-change interrupt, channel 1 | |
SCLK | SPI bus serial clock | |
B2 | B2 | GPIO port B, bit 2 |
PCINT2 | pin-change interrupt, channel 2 | |
MOSI | SPI master-out/slave-in | |
B3 | B3 | GPIO port B, bit 3 |
PCINT3 | pin-change interrupt, channel 3 | |
MISO | SPI master-in/slave-out | |
3.3V | 3.3V | Weak internal 3.3V supply (up to ~55mA with 5V USB) |
Right Side
VBAT | VBAT | +Input from battery (up to 16V) |
GND | GND | board ground |
VBUS | VBUS | 5V Power from USB (no protection) |
C7 | C7 | GPIO port C, bit 7; connected to RED led (high = on) |
ICP3 | Input capture, channel 3 | |
OC4A | output compare 4A | |
D6 | D6 | GPIO port D, bit 6; |
T1 | Timer 1 external clock input | |
ADC9 | analog-to-digital converter, channel 9 | |
/OC4D | inverted output compare 4D | |
B7 | B7 | GPIO port B, bit 7 |
PCINT7 | pin-change interrupt, channel 7 | |
OC0A | output compare 0A | |
OC1C | output compare 1C | |
/RTS | UART flow control | |
B6 | B6 | GPIO part B, bit 6 |
PCINT6 | pin-change interrupt, channel 6 | |
ADC13 | analog-to-digital converter, channel 13 | |
OC1B | output compare 1B | |
OC4B | output compare 4B | |
B5 | B5 | GPIO port B, bit 5 |
PCINT5 | pin-change interrupt, channel 5 | |
ADC12 | analog-to-digital converter, channel 12 | |
OC1A | output compare 1A | |
/OC4B | inverted output compare 4B | |
E6 | E6 | GPIO port E, bit 6; |
INT6 | external interrupt, channel 6 | |
AIN0 | analog comparator positive input | |
C6 | C6 | GPIO port C, bit 6 |
OC3A | output compare 3A | |
/OC4A | inverted output compare 4A | |
D0 | D0 | GPIO port D, bit 0 (pulled up by a 2.2k resistor) |
OC0B | output compare 0B | |
SCL | I2C (TWI) clock | |
INT0 | External Interrupt, channel 0 | |
D1 | D1 | GPIO port D, bit 1 (pulled up by a 2.2k resistor) |
SDA | I2C (TWI) data | |
INT1 | External Interrupt, channel 1 | |
D3 | D3 | GPIO port D, bit 3 |
TXD1 | USART transmit | |
INT3 | External Interrupt, channel 3 | |
D2 | D2 | GPIO port D, bit 2 |
RXD1 | USART receive | |
INT2 | External Interrupt, channel 2 |
Bottom Row
D4 | D4 | GPIO port D, bit 4 |
ICP1 | Input capture, channel 1 | |
ADC8 | analog-to-digital converter, channel 8 | |
D7 | D7 | GPIO port D, bit 7 |
T0 | Timer 0 external clock input | |
ADC10 | analog-to-digital converter, channel 10 | |
OC4D | output compare 4D | |
B4 | B4 | GPIO port B, bit 4 |
PCINT4 | pin-change interrupt, channel 4 | |
ADC11 | analog-to-digital converter, channel 11 | |
GND | GND | board ground |
EN | EN | Battery voltage regulator enable. Drive low to disconnect battery. |