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
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Examples:
Send: AT+PM=1 Return: OK+PM=1 (Modify into power consumption mode 1)
Send: AT+PM Return: OK+PM=1 (Inquire as power consumption mode 1)
Reminder:
In the low power consumption mode, the average operating current of the module is related to the
broadcast interval. If the broadcast interval is increased, the operating current will decrease. The table
below indicates the average operating current reference values for low power consumption of the module
at different broadcast intervals:
Broadcast interval (mS) 200 500 1000 2000 5000 10000
Average operating current (µA)
70 29 16 11 6 4.5
Note:
The parameters said above are measured under the condition that the operating voltage of the module is
3.3V. The measurement error of ±20% caused by the difference of conditions is normal and for reference
only. The internal power supply of the module is DC/DC. With the decrease of the working voltage of the
module, the operating current of the module will increase correspondingly.
5.3.8 Module enters sleep mode command
command Response Explanation Details
AT+SLEEP OK+SLEEP
Module enters
sleep mode (low
power operation)
After the module returns to OK+SLEEP, it enters low power
consumption state, the broadcast or connection state will be
maintained, and serial communication will be turned off.
The transmitting and receiving of data will cause the module
exit from sleep state, and the module restart will also cause
the module to exit from sleep mode. If the module is required
to enter sleep as soon as it is powered on, please send the
command AT+PM=1.
Examples:
Send: AT+SLEEP Return: OK+SLEEP
In order to control low power consumption in a quick and human-oriented manner, this module
introduces IO to control power consumption. When LPIN (PIN19, input pin) is at high level, it can enter
low power consumption operation through AT+SLEEP command, and when LPIN is at low level, it will
unconditionally exit from low power consumption operation.
Low power consumption is determined by the command AT+SLEEP and pin LPIN, and its logic
relation is as follows:
LPIN (default pull up, high level) High level High level Low level Low level
AT+SLEEP command Enter AT+SLEEP
Exit from
AT+SLEEP
Enter AT+SLEEP
Exit from
AT+SLEEP
Module power consumption state
Lower power
consumption
High power
consumption
High power
consumption
High power
consumption