User's Manual

User Manual of HC-42 Bluetooth Serial Port Communication Module G
athering information and Carrying Dreams
Website：
http://www.hc01.com
Guangzhou HC Information Technology Co., Ltd
Address: Room 608, No.19, Jiangong Road, Tianhe Science Park, Tianhe District, Guangzhou City, Guangdong Province
Technical customer service QQ: 445253184 Sales hot line: 020-8408-3341
PAGE
7
PINS Definitions
I/O
direction
Explanations
1TXD（P0.06） O UART output port, 1.8~3.6V level , consistent with operating voltage
2RXD
（
P0.08
）
I, pull up UART input port, 1.8~3.6V level, consistent with operating voltage
3 P0.07 No setting, suspended
4 P0.05 No setting, suspended
5 P0.28 O Output low level after power on
6 SWDCLK I Simulation, programming clock pin, please suspended
7 SWDIO I/O Simulation, programming data pin, please suspended
8 P0.29 No setting, suspended
9 P0.30 No setting, suspended
10 P0.31 No setting, suspended
11 RESET I, pull up Module reset pin, requiring a low level of not less than 50ms to reset.
12 VCC I Power supply pin, requiring power supply of DC 3.3V, power supply
current of not less than 50mA
13 GND Module common ground
14 LEDCON I Module on-board indicator LED2 control pin (Note①)
15 P0.12 No setting, suspended
16 LED1
（
P0.13
）
O External indication LED output pin (Note②)
17 LINK（P0.14） O Connection indication (high level output in disconnected state, low
level output after connection)
18 KEY+（P0.15） I, pull down This pin is connected to high level, and the master is used to clear
the recorded slaver address.
19 LPIN（P0.16） I, pull up Low power control pin, high level means "low Power consumption"
and low level means "exit from low power consumption" (Note ③)
20 LPOUT
（
P0.17
）
O Module Low Power Indicator (Low Level Output in Standard State,
High Level Output in Low Power State)
21 P0.18 No setting, suspended
22 P0.19 No setting, suspended
23 P0.20 No setting, suspended
24 P0.22 No setting, suspended
25 P0.23 No setting, suspended
26 P0.11 No setting, suspended