Pin descriptions
STM32F103xx
18/67
Table 3.
Pin definitions
Pins
Pin name
Ty
p
e
(1)
I
/ O
L
e
vel
(2
)
Main function
(3)
(after reset)
Default alternate functions
BGA1
00
LQ
FP4
8
LQ
FP6
4
LQ
FP100
A3
-
-
1
PE2/TRACECK
I/O
FT
PE2
TRACECK
B3
-
-
2
PE3/TRACED0
I/O
FT
PE3
TRACED0
C3
-
-
3
PE4/TRACED1
I/O
FT
PE4
TRACED1
D3
-
-
4
PE5/TRACED2
I/O
FT
PE5
TRACED2
E3
-
-
5
PE6/TRACED3
I/O
FT
PE6
TRACED3
B2
1
1
6
V
BAT
S
V
BAT
A2
2
2
7
PC13-ANTI_TAMP
(4)
I/O
PC13
ANTI_TAMP
A1
3
3
8
PC14-OSC32_IN
(4)
I/O
PC14-OSC32_IN
B1
4
4
9
PC15-OSC32_OUT
(4)
I/O
PC15-OSC32_OUT
C2
-
-
10
V
SS_5
S
V
SS_5
D2
-
-
11
V
DD_5
S
V
DD_5
C1
5
5
12
OSC_IN
I
OSC_IN
D1
6
6
13
OSC_OUT
O
OSC_OUT
E1
7
7
14
NRST
I/O
NRST
F1
-
8
15
PC0/ADC_IN10 I/O
PC0
ADC_IN10
F2
-
9
16
PC1/ADC_IN11 I/O
PC1
ADC_IN11
E2
-
10
17
PC2/ADC_IN12 I/O
PC2
ADC_IN12
F3
-
11
18
PC3/ADC_IN13
I/O
PC3
ADC_IN13
G1
8
12
19
V
SSA
S
V
SSA
H1
-
-
20
V
REF-
S
V
REF-
J1
-
-
21
V
REF+
S
V
REF+
K1
9
13
22
V
DDA
S
V
DDA
G2
10
14
23
PA0-WKUP/
USART2_CTS/
ADC_IN0/TIM2_CH1_ETR
I/O
PA0
WKUP/USART2_CTS
C_IN0/
TIM2_CH1_ETR
H2
11
15
24
PA1/USART2_RTS/
ADC_IN1/TIM2_CH2
I/O
PA1
USART2_RTS
/
ADC_IN1/
TIM2_CH2
J2
12
16
25
PA2/USART2_TX/
ADC_IN2/ TIM2_CH3
I/O
PA2
USART2_TX
/
ADC_IN2/ TIM2_CH3
K2
13
17
26
PA3/USART2_RX/
ADC_IN3/TIM2_CH4
I/O
PA3
USART2_RX
/
ADC_IN3/TIM2_CH4
E4
-
18
27
V
SS_4
S
V
SS_4
F4
-
19
28
V
DD_4
S
V
DD_4