Schematic

PE6 (INT6/AIN0)
1
UVcc
2
D-
3
D+
4
UGnd
5
UCap
6
VBus
7
PB0 (SS/PCINT0)
8
PB1 (PCINT1/SCK)
9
PB2 (PDI/MOSI/PCINT2)
10
PB3 (PDO/MISO/PCINT3)
11
PB7 (OC0A/OC1C/PCINT7/RTS)
12
RESET
13
VCC
14
GND
15
XTAL2
16
XTAL1
17
PD0 (INT0/SCL/OC0B)
18
PD1 (INT1/SDA)
19
PD2 (INT2/RXD1)
20
PD3 (INT3/TXD1)
21
PD5 (XCK1/CTS)
22
GND
23
AVCC
24
PD4 (ICP1/ADC8)
25
PD6 (T1/OC4D/ADC9
26
PD7 (T0/OC4D/ADC10)
27
PB4 (PCINT4/ADC11)
28
PB5 (OC1A/OC4B/PCINT5/ADC12)
29
PB6 (OC1B/OC4B/PCINT6/ADC13)
30
PC6 (OC3A/OC4A)
31
PC7 (ICP3/CLK0/OC4A)
32
PE2 (HWB)
33
VCC
34
GND
35
PF7 (ADC7/TDI)
36
PF6 (ADC6/TDO)
37
PF5 (ADC5/TMS)
38
PF4 (ADC4/TCK)
39
PF1 (ADC1)
40
PF0 (ADC0)
41
AREF
42
GND
43
AVCC
44
PAD
45
ATmega32U4
1 uF
C3
VCC
L1
10 uH
0.1 uF
C5
AVCC
VCC AVCC
VBUS
22
R2
22
R1
nRESET
MISO
MOSI
SCK
TXLED
D8
D9
D10
D11
D3
D2
D0
D1
D4
D12
D6
D7
D5
D13
A0
A1
AREF
D-
D+ D+R
D-R
HWB
A2
A3
A4
A5
RXLED
Y1 16 MHz
10 pF
C1
10 pF
C2
XTAL1
XTAL2
AVR3V3
VBUS
1
D-
2
D+
3
ID
4
GND
5
NC
6
NC
7
NC
8
NC
9
NC
10
NC
11
USB Micro-B
VCC
0.1 uF
C31
0.1 uF
C25
0.1 uF
C32
SW1
A-Star 32U4 Prime LV
©2019 Pololu Corporation
www.pololu.com
Schematic diagram
Primary microcontroller connections
Page 1 of 6
R
0.1 uF
C4
PIC101
PIC102
COC1
PIC201
PIC202
COC2
PIC301
PIC302
COC3
PIC401
PIC402
COC4
PIC501
PIC502
COC5
PIC2501
PIC2502
COC25
PIC3101
PIC3102
COC31
PIC3201
PIC3202
COC32
PIJ101
PIJ102
PIJ103
PIJ104
PIJ105
PIJ106 PIJ107
PIJ108
PIJ109 PIJ1010 PIJ1011
COJ1
PIL101 PIL102
COL1
PIR101 PIR102
COR1
PIR201 PIR202
COR2
PISW101 PISW102
COSW1
PIU101
PIU102
PIU103
PIU104
PIU105
PIU106
PIU107
PIU108
PIU109
PIU1010
PIU1011
PIU1012
PIU1013
PIU1014
PIU1015
PIU1016
PIU1017
PIU1018
PIU1019
PIU1020
PIU1021
PIU1022
PIU1023
PIU1024
PIU1025
PIU1026
PIU1027
PIU1028
PIU1029
PIU1030
PIU1031
PIU1032
PIU1033
PIU1034
PIU1035
PIU1036
PIU1037
PIU1038
PIU1039
PIU1040
PIU1041
PIU1042
PIU1043
PIU1044
PIU1045
COU1
PIY101
PIY102
PIY103
PIY104
COY1