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3.1.2
Recommended Power Supply Circuit
It is recommended that a switching mode power supply or a linear regulator power supply is used.
It is important to make sure that all the components used in the power supply circuit can resist a
peak current up to 2A.
The following figure shows the linear regulator reference circuit with 5V input and 3.8V output.
If there is a big voltage difference between input and output for VBAT power supply, or the
efficiency is extremely important, then a switching mode power supply will be preferable. The
following figure shows the switching mode power supply reference circuit.
Figure 8: Switching mode power supply reference circuit
Note: The Switching Mode power supply solution for VBAT must be chosen carefully against
Electro Magnetic Interference and ripple current from depraving RF performance.
3.1.3
Voltage Monitor
To monitor the VBAT voltage, the AT command "AT+CBC" can be used.
For monitoring the VBAT voltage outside or within a special range, the AT command
"AT+CVALARM" can be used to enable the under-voltage warning function.
If users need to power off MODULE, when the VBAT voltage is out of a range, the AT command
"AT+CPMVT" can be used to enable under-voltage power-off function.
Note: Under-voltage warning function and under-voltage power-off function are disabled by
default. For more information about these AT commands, please refer to Document [1].
SIM7600NA_user manual _V1.00
Figure 7: Linear regulator reference circuit
25
Smart Machine Smart Decision
2020-1-7
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