Pololu 3pi+ 32U4 Schematic Diagram

R
3pi+ 32U4 Control Board
© 2020 Pololu Corporation
®
www.pololu.com
SW1
USB Micro-B VBUS
1
VBUS
2
D-
R3
3
D+
22
4
ID
5
GND
Y1 16 MHz
C4
10 pF
LCD 5V
1
Vss
2
VDD
R1
3
Vo
4
RS
D0
5
R/W
6 D1
E
7
DB0
8
DB1
9
DB2
10
DB3
11 D14
DB4
12 D17
DB5
13 D13
DB6
14 PD5
DB7
nRESET
ATmega32U4
13
RESET
7
R2 VBus
3
D-
4
22 D+
D17 (RXL/SS) 8
PB0 (SS/PCINT0)
D15 (SCK) 9
PB1 (PCINT1/SCK)
D16 (MOSI) 10
PB2 (PDI/MOSI/PCINT2)
D14 (MISO) 11
PB3 (PDO/MISO/PCINT3)
D8 28
PB4 (PCINT4/ADC11)
D9 29
PB5 (OC1A/OC4B/PCINT5/ADC12)
D10 30
PB6 (OC1B/OC4B/PCINT6/ADC13)
D11 12
PB7 (OC0A/OC1C/PCINT7/RTS)
PE2 (HWB)
D3 (SCL) 18
PD0 (INT0/SCL/OC0B) PE6 (INT6/AIN0)
D2 (SDA) 19
PD1 (INT1/SDA)
D0 20
PD2 (INT2/RXD1)
D1 21
PD3 (INT3/TXD1) PC6 (OC3A/OC4A)
D4 25
PD4 (ICP1/ADC8) PC7 (ICP3/CLK0/OC4A)
PD5 (TXL) 22
PD5 (XCK1/CTS)
D12 26
PD6 (T1/OC4D/ADC9
D6 27
PD7 (T0/OC4D/ADC10) PF7 (ADC7/TDI)
PF6 (ADC6/TDO)
PF5 (ADC5/TMS)
16
XTAL2 PF4 (ADC4/TCK)
PF1 (ADC1)
17
XTAL1 PF0 (ADC0)
C5
10 pF
5V
R6
1.5k
R8
D13 D14
R10 SW2 D2
2.21k Button A Green
PD5
R12
D4 R11
Yellow 1k
5V L1 AVCC
10 uH
C1
0.1 uF
AVR3V3
6
UCap
C2
14
VCC 1 uF
34 5V
VCC
2
UVcc
AVCC
24
AVCC
44
AVCC
C3
42 AREF
AREF
0.1 uF
33 PE2
1 D7
31 D5
32 D13
36 A0
37 A1
38 A2
39 A3
40 A4
41 A5
5V
R7
2.21k
1k R9 1.5k
D3
Red
D17
3k R13 3k
SW3 SW4
Button B Button C
Page 1 of 4
Front expansion header Mid expansion header
EMIT D11
BUMPR D5
BUMPL D4
DOWN5 A4
DOWN4 A3
DOWN3 A2
DOWN2 A0
DOWN1 D12
5V 3V3
1 1
2 2
D3 (SCL) (SDA) D2
3 3
5V
D1 Buzzer
D6 BZCTRL
Q1
R14
100k
Schematic diagram

Microcontroller and user interface

D3 (SCL) (SDA) D2
1 1
A5 PE2
2 2
A1 D6
3 3
5V 5V
4 4
D0 D1
5 5
6 6
7 7
5V
AVRISP
D14 1 2
MISO VCC
D15 3
SCK
D16 4
MOSI
nRESET 5 6
RST GND
VSW
R4
20k
A1 BATLEV
R5
10k