User's Manual

ALXC2X USER MANUAL
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8
1.1.2 PIN Description
Table 1 Pins Description
Pin#
Type
Name（Main function）
Alternate functions
PIN connection(when not using)
1
S
GND
2
I/O
USART1_ TX
PB6
floating
3
I/O
USART1_ RX
PA10, USB_ID
floating
4
S
VIO
5
I/O
I2C2_SDA
PB3, SPI1_SCK, USART1_RX
floating
6
I/O
I2C2_SCL
PB10
floating
7
I/O
SWCLK
PA14
floating
8
I
BOOT0
floating
9
S
VBAT
floating
10
I/O
USB_ID
PB13
floating
11
I/O
SWDIO
PA13
floating
12
I
NRST
floating
13
S
VIO
14
S
GND
15
S
GND
16
I/O
USB_DP
PA12, USART1_RTS, USART6_RX
floating
17
I/O
USB_DM
PA11, USART1_CTS, USART6_TX
floating
18
I/O
SPI1_NSS_EXT
PB12, I2C2_SMBA
floating
19
I/O
SPI1_MOSI
PA7, ADC1_7
floating
20
I/O
SPI1_MISO
PB4
floating
21
I/O
SPI1_SCK
PA5, ADC1_5
floating
22
S
GND
23
S
GND
24
I/O
GPIO1(PB1)
ADC1_9
floating
25
I/O
GPIO2(PB0)
ADC1_8
floating
26
NC
NC
BT_PCM_SYNC
floating
27
NC
NC
BT_PCM_CLK
floating
28
NC
NC
BT_PCM_IN
floating
29
NC
NC
BT_PCM_OUT
floating
30
S
VIO
31
I/O
EXT_SLEEP_CLK
External 32.768K Clock
floating
32
NC
NC
BT_I2S_DI
floating
33
NC
NC
BT_I2S_WS
floating
34
NC
NC
BT_I2S_SCK
floating
35
NC
NC
BT_I2S_DO
floating
36
S
GND