Product Info

LTE-A Module Series
EG12 Hardware Design
EG12_Hardware_Design 39 / 100
In order to avoid damaging internal flash, please do not switch off the power supply when the module
works normally. Only after the module is shut down by PWRKEY or AT command, the power supply can
be cut off.
3.6.4. Monitor the Power Supply
AT+CBC command can be used to monitor the VBAT_BB voltage value. For more details, please refer to
document [2].
3.7. Turn on and off Scenarios
3.7.1. Turn on the Module Using PWRKEY
The following table shows the pin definition of PWRKEY.
Table 8: PWRKEY Pin Description
When EG12 is in power down mode, it can be turned on and enter into normal mode by driving the
PWRKEY pin to a low level for at least 500ms. It is recommended to use an open drain/collector driver to
control the PWRKEY. After STATUS outputs a high level, PWRKEY can be released. A simple reference
circuit is illustrated in the following figure.
Turn on pulse
PWRKEY
4.7K
47K
≥500ms
Figure 11: Turn on the Module with a Driving Circuit
Pin Name
Pin No.
Description
DC Characteristics
Comment
PWRKEY
2
Turn on/off the module
V
IH
max=2.1V
V
IH
min=1.3V
V
IL
max=0.5V
1.8V power domain.
Pulled-up internally.
Active low.
NOTE