User's Manual

Bluetooth Low Energy Module
Shanghai Ehong Technologies Co., Ltd
NC
7
NC NC
NC
8
NC NC
NC
9
NC NC
GND
10
Ground Ground
USB_DP
11
Digital I/O
USB data
positive/GPIO/ANA_E3
USB_DM
12
Digital I/O
USB data
Minus/GPIO/ANA_E3
UART_TX
13
Digital I/O
UART_TX/PWM2/GPIO/A
NA_C2
Optional 32KHz crystal
output
UART_RX
14
Digital I/O
UART_TX/PWM3/GPIO/A
NA_C3
Optional 32KHz crystal
input
UART_RTS
15
Digital I/O
UART_RTS/PWM3/GPIO/
ANA_C4
UART_CTS
16
Digital I/O
UART_RTS/PWM4/GPIO/
ANA_C4
ANA_A(1)
17
Digital I/O ANA_A1
PWM2/SW/AN
A_B(0)
18
Digital I/O
PWM2/single wire
slave/GPIO/ANA_B(0)
NC
19
NC NC
VDD_3V3
20
Power Supply
Button cell battery or DC
1.8V to 3.6V
GND
21
Ground Ground
PWM2_N/ANA
_B(1)
22
Digital I/O
PWM2
inverting/GPIO/ANA_B1
UART_RTS
23
Digital I/O
UART_RTS/PWM3/GPIO/
ANA_C4
UART_CTS
24
Digital I/O
UART_RTS/PWM4/GPIO/
ANA_C4
UART_TX
25
Digital I/O
UART_TX/PWM2/GPIO/A
NA_C2
Optional 32KHz crystal
output
UART_RX
26
Digital I/O
UART_TX/PWM3/GPIO/A
NA_C3
Optional 32KHz crystal
input
DI/PWM5/ANA
_B(6)
27
Digital I/O
I2C_SDA/PWM5/GPIO/AN
A_B6