Pololu A-Star 32U4 Series Quick start guide

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
VBUS 1
D- 2
D+ 3
ID 4
GND 5
NC
6NC 7NC 8NC 9NC
10 NC
11
USB Micro-B
1 uF
C3
5V
3V3
L1
10 uH
0.1 uF
C5
AVCC
5V AVCC
0.1 uF
C4
VBUS
22
R2
22
R1
MISO
MOSI
SCK
TXLED
D8
D9
D10
D11
D3
D2
D0
D1
D4
D12
D6
D7
D5
D13
A0
A1
AREF
HWB
A2
A3
A4
A5
RXLED
Y1 16 MHz
C1 C2
SW1
A-Star 32U4 Mini
©2014–2018 Pololu Corporation
www.pololu.com
Schematic diagram
Primary microcontroller connections
R
Page 1 of 7
PIC101
PIC102
COC1
PIC201
PIC202
COC2
PIC301
PIC302
COC3
PIC401 PIC402
COC4
PIC501
PIC502
COC5
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

MISO
1VCC 2
SCK
3
MOSI
4
RST
5GND 6
AVRISP
5V
nRESET
MOSI
MISO
SCK
D2
Green
1k
R4
TXLED
5V
D1
Yellow
1k
R3
D13
A0
A1
nRESET
A2
A3
A4
A5
D3
Red
1k
R5
RXLED
5V
TXLED
RXLED
SCK
MOSI
MISO
AREF
HWB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
5V
3V3
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17 BAT-
BAT+
VIN
A-Star 32U4 Mini
©2014–2018 Pololu Corporation
www.pololu.com
Schematic diagram
LEDs and external connections
R
Page 2 of 7
PID101
PID102
COD1
PID201
PID202
COD2
PID301
PID302
COD3
PIJ201 PIJ202
PIJ203
PIJ204
PIJ205 PIJ206
COJ2
PIJP1601
COJP16
PIP101
PIP102
PIP103
PIP104
PIP105
PIP106
PIP107
PIP108
PIP109
PIP1010
PIP1011
PIP1012
PIP1013
PIP1014
PIP1015
PIP1016
PIP1017
COP1
PIP201
PIP202
PIP203
PIP204
PIP205
PIP206
PIP207
PIP208
PIP209
PIP2010
PIP2011
PIP2012
PIP2013
PIP2014
PIP2015
PIP2016
PIP2017
COP2
PIR301
PIR302
COR3
PIR401
PIR402
COR4
PIR501
PIR502
COR5

5VVREG VBUS
0.1 uF
C14
0.1 uF
C15
STAT 1
EN
2
VSNS
3
ILIM 4
GND
5
IN2
6
OUT 7 IN1
8
PAD
9
TPS2113A
1 uF
C9
100k
R7
20k
R8
0.1 uF
C8
270
R9
STAT
SHDN
0.1 uF
C13
10 uF
C7
10 uF
C10
10 uF
C11
10 uF
C12
VIN
0.1 uF
C6 1
2
STAT
A-Star 32U4 Mini
©2014–2018 Pololu Corporation
www.pololu.com
Schematic diagram
Power switching
R
Page 3 of 7
PIC601
PIC602
COC6
PIC701
PIC702
COC7
PIC801
PIC802
COC8
PIC901
PIC902
COC9
PIC1001
PIC1002
COC10
PIC1101
PIC1102
COC11
PIC1201
PIC1202
COC12
PIC1301
PIC1302
COC13
PIC1401
PIC1402
COC14
PIC1501
PIC1502
COC15
PIJP?01
PIJP?02
COJP?
PIR701
PIR702
COR7
PIR801
PIR802
COR8
PIR901
PIR902
COR9
PIU201
PIU202
PIU203
PIU204
PIU205
PIU206
PIU207 PIU208
PIU209
COU2

L3
FB 10
VOUT 2
VIN
5
EN
6
GND
9
PGND 4 PS
8
UVLO
7
VAUX
1
PAD 11
TPS61202
L2 2.2 uH
VREG
VIN
0.1 uF
C16
REGEN
1 uF
C18
Q2
BAT-
10 uF
C17
(BAT+)
NP
R10
REGEN
100k
R6
VIN
Q1
SHDN
A-Star 32U4 Mini
©2014–2018 Pololu Corporation
www.pololu.com
Schematic diagram
ULV regulator
R
Page 4 of 7
PIC1601
PIC1602
COC16
PIC1701
PIC1702
COC17
PIC1801
PIC1802
COC18
PIL201 PIL202
COL2
PIQ101
PIQ102
PIQ103
COQ1
PIQ201
PIQ202 PIQ203
COQ2
PIR601
PIR602
COR6
PIR1001
PIR1002
COR10
PIU301
PIU302
PIU303
PIU304
PIU305
PIU306
PIU307
PIU308
PIU309
PIU3010
PIU3011
COU3

L1
1L2 10
FB 8
VOUT 9 VIN
2
PAD 11
VAUX
6
EN
3
GND
7
PS/SYNC
4PG 5
TPS63061
0.1 uF
C18
10 uF
C17
10 uF
C19
10 uF
C20
VIN
VREG
L2 1.2 uH
REGEN
Q2
D4
6.8 V
100k
R10
BAT+
10 uF
C16
(BAT-)
REGEN
220k
R6
VIN
Q1
SHDN
A-Star 32U4 Mini
©2014–2018 Pololu Corporation
www.pololu.com
Schematic diagram
LV regulator
R
Page 5 of 7
PIC1601
PIC1602
COC16
PIC1701
PIC1702
COC17
PIC1801
PIC1802
COC18
PIC1901
PIC1902
COC19
PIC2001
PIC2002
COC20
PID401
PID402
COD4
PIL201 PIL202
COL2
PIQ101
PIQ102
PIQ103
COQ1
PIQ201
PIQ202 PIQ203
COQ2
PIR601
PIR602
COR6
PIR1001
PIR1002
COR10
PIU301
PIU302
PIU303
PIU304
PIU305
PIU306
PIU307
PIU308
PIU309
PIU3010
PIU3011
COU3

PHASE
5
FB 10
SS 1
PGND
6
PG
8
VIN
4
SYNC 2
FS 12
COMP 11
VCC 9
EN
7
BOOT
3
GND_PAD
13
ISL85415
L2 22 uH
100 nF
C17
91k
R11
12.4k
R12
VIN
VREG
FB
100 pF
C19
REGEN
1 uF
C18
Q2
D4
12 V
100k
R10
BAT+
4.7 uF
C16
(BAT-)
REGEN
300k
R6
VIN
Q1
SHDN
A-Star 32U4 Mini
©2014–2018 Pololu Corporation
www.pololu.com
Schematic diagram
SV regulator (ac02c)
R
Page 6 of 7
PIC1601
PIC1602
COC16
PIC1701 PIC1702
COC17
PIC1801
PIC1802
COC18
PIC1901
PIC1902
COC19
PID401
PID402
COD4
PIL201 PIL202
COL2
PIQ101
PIQ102
PIQ103
COQ1
PIQ201
PIQ202 PIQ203
COQ2
PIR601
PIR602
COR6
PIR1001
PIR1002
COR10
PIR1101
PIR1102
COR11
PIR1201
PIR1202
COR12
PIU301
PIU302
PIU303
PIU304
PIU305
PIU306
PIU307
PIU308
PIU309
PIU3010
PIU3011
PIU3012
PIU3013
COU3

PHASE
5
FB 10
SS 1
PGND
6
PG
8
VIN
4
SYNC 2
FS 12
COMP 11
VCC 9
EN
7
BOOT
3
GND_PAD
13
ISL85418
L2 22 uH
100 nF
C17
91k
R11
12.4k
R12
VIN
VREG
FB
100 pF
C19
REGEN
1 uF
C18
Q2
D4
16.2 V
100k
R10
BAT+
4.7 uF
C16
(BAT-)
REGEN
300k
R6
VIN
Q1
SHDN
A-Star 32U4 Mini
©2014–2018 Pololu Corporation
www.pololu.com
Schematic diagram
SV regulator (ac02f)
R
Page 7 of 7
PIC1601
PIC1602
COC16
PIC1701 PIC1702
COC17
PIC1801
PIC1802
COC18
PIC1901
PIC1902
COC19
PID401
PID402
COD4
PIL201 PIL202
COL2
PIQ101
PIQ102
PIQ103
COQ1
PIQ201
PIQ202 PIQ203
COQ2
PIR601
PIR602
COR6
PIR1001
PIR1002
COR10
PIR1101
PIR1102
COR11
PIR1201
PIR1202
COR12
PIU301
PIU302
PIU303
PIU304
PIU305
PIU306
PIU307
PIU308
PIU309
PIU3010
PIU3011
PIU3012
PIU3013
COU3