Product Info

LPWA Module Series
BG95 Series Hardware Design
BG95_Series_Hardware_Design 40 / 106
3.5.3. Monitor the Power Supply
AT+CBC command can be used to monitor the VBAT_BB voltage value. For more details, see document
[2].
3.6. Turn on and off Scenarios
3.6.1. Turn on Module Using the PWRKEY Pin
The following table shows the pin definition of PWRKEY.
Table 8: Pin Definition of PWRKEY
When BG95 is in power off mode, it can be turned on by driving PWRKEY low for 500–1000 ms. It is
recommended to use an open drain/collector driver to control the PWRKEY. A simple reference circuit is
illustrated in the following figure.
Turn on pulse
PWRKEY
4.7K
47K
500–1000 ms
10nF
Figure 6: Turn on the Module Using Driving Circuit
Another way to control the PWRKEY is using a button directly. When pressing the key, electrostatic strike
may generate from the finger. Therefore, a TVS component is indispensable to be placed nearby the
button for ESD protection. A reference circuit is shown in the following figure.
Pin Name
Pin No.
Description
DC Characteristics
Comment
PWRKEY
15
Turns on/off the
module
Vnorm = 1.5 V
V
IL
max = 0.45 V
The output voltage is 1.5 V because
of the voltage drop inside the
Qualcomm chipset.