Pololu A-Star 32U4 Schematic Diagram

A-Star 32U4 Robot Controller SV with Raspberry Pi Bridge
©2016 Pololu Corporation
www.pololu.com
nRESET
SW1
VBUS
USB Micro-B
1
VBUS
R2
2
D-
R1 22
3
D+
22
4 D17 (RXL/SS)
ID
D15 (SCK)
5 D16 (MOSI)
GND
D14 (MISO)
D8
D9
D10
D11
D3 (SCL)
D2 (SDA)
D0
D1
D4
PD5 (TXL)
D12
D6
Y1 16 MHz
C1 C2
10 pF 10 pF
D0
5V D1
AVRISP D2
D14 (MISO) 1 2 D3
MISO VCC
D4
D15 (SCK) 3 D5
SCK
D6
D16 (MOSI) 4 D7
MOSI
D8
nRESET 5 6 D9
RST GND
D10
D11
D12
D13
ATmega32U4
13 6
RESET UCap
7 14
VBus VCC
3 34
D- VCC
4
D+
2
UVcc
8
PB0 (SS/PCINT0)
9 24
PB1 (PCINT1/SCK) AVCC
10 44
PB2 (PDI/MOSI/PCINT2) AVCC
11
PB3 (PDO/MISO/PCINT3)
28
PB4 (PCINT4/ADC11)
29 42
PB5 (OC1A/OC4B/PCINT5/ADC12) AREF
30
PB6 (OC1B/OC4B/PCINT6/ADC13)
12
PB7 (OC0A/OC1C/PCINT7/RTS)
33
PE2 (HWB)
18 1
PD0 (INT0/SCL/OC0B) PE6 (INT6/AIN0)
19
PD1 (INT1/SDA)
20
PD2 (INT2/RXD1)
21 31
PD3 (INT3/TXD1) PC6 (OC3A/OC4A)
25 32
PD4 (ICP1/ADC8) PC7 (ICP3/CLK0/OC4A)
22
PD5 (XCK1/CTS)
26
PD6 (T1/OC4D/ADC9
27 36
PD7 (T0/OC4D/ADC10) PF7 (ADC7/TDI)
37
PF6 (ADC6/TDO)
38
PF5 (ADC5/TMS)
16 39
XTAL2 PF4 (ADC4/TCK)
40
PF1 (ADC1)
17 41
XTAL1 PF0 (ADC0)
1
2
1 3 1
nRESET
2 4 2 1
D14
3 5 3 2
D15
4 6 4 3
D16
5 7 5 4
D17
6 8 6 5
PD5
7 7 6
AREF
8 8 7
A5
9 9 8
A4
10 10 9
A3
11 1 11 10
A2
12 2 12 11
A1
13 3 13 12
A0
14 4 14 13
PE2
5 14
6
5V L1 AVCC
10 uH
C5
0.1 uF
D13
AVR3V3
C3
1 uF
5V
AVCC
C4
AREF
0.1 uF
PE2
D7
D5
D13
A0
A1
A2
A3
A4
A5
MAX14870
1
D9 5
2 1 PWM
3 2
D12 6
4 3 DIR
5 4
7
6 5 FAULT
6
8
7 EN
8
9
4
1 10 R35 SNS
2 11 100k
1
3 12 COM
12
4 13 COM
5 14
6
7
8
Page 1 of 3
5V
R4
1.5k
R5
1k
R3
D2
2.21k
Green
R6
PD5 (TXL) D17 (RXL/SS)
3k
D1 SW2
Yellow
VIN
R12
105k
A1 BATLEV
D6
R11
15k
VIN
3
VDD
10
VDD
VIN VIN
2 M1B
M1
C23 C25
11 M1A
M2 0.1 uF 0.1 uF
9
GND
13
GND (PAD)
Schematic diagram

Microcontroller and motor drivers

5V
R7
2.21k
R8
D14
1.5k
D3
SW4
Red
R9
3k
R10
SW3
1k
5V
BZ1
D4
buzzer
BZCTRL
Q1
R13
100k
VIN
MAX14870
D10 5 3
PWM VDD
10
VDD
PE2 6
DIR
7
FAULT
2 M2B
M1
8
EN
11 M2A
M2
4
R36 SNS
100k
1 9
COM GND
12 13
COM GND (PAD)