M10 Hardware Design
3.4 Power up and power down scenarios
3.4.1 Turn on
The module can be turned on by various ways, which are described in following chapters:
z Via PWRKEY pin: starts normal operating mode (please refer to chapter 3.4.1.1);
z Via RTC interrupt: starts ALARM modes (please refer to chapter 3.4.1.2)
Note: The AT command must be set after the module is power on and Unsolicited Result Code
“RDY” is received from the serial port. However if the module was set autobauding, the serial
port will receive nothing, the AT command can be set after 2-3S from the module is power on.
You can use “AT+IPR=x;&W” to set a fix baud rate and save the configuration to non-volatile
flash memory. After the configuration was saved as fix baud rate, the Code “RDY” should be
received from the serial port all the time when the module was power on. Refer to Chapter
“AT+IPR” in document [1].
3.4.1.1 Turn on module using the PWRKEY pin (Power on)
You can turn on the module by driving the PWRKEY to a low level voltage for some time and
then releasing it. An open drain driver circuit is suggested in application to control the PWRKEY.
The simple circuit illustrates as the following figure.
4.7K
47K
Turn on impulse
PWRKEY
Figure 5: Turn on the module using driving circuit
The other way to control the PWRKEY is using a keystroke directly. A TVS component need to
place nearby the keystroke for ESD protection. When pressing the key, electro-static may generate
from finger. The simple circuit illustrates as the following figure.
M10_HD_V1.00 - 24 -
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