Specifications

Smart Machine Smart Decision
SIM7080G _Hardware Design _V1.03 22 2019-12-13
Table 7: Recommended TVS diode list
No.
Manufacturer
Part Number
Package
1
Prisemi
PESDHC2FD4V5B
DFN1006
2
Prisemi
PESDHC3D3V3U
SOD323
3
WILLsemi
ESD5651N-2/TR
DFN1006
3.1.2 Recommended Power Supply Circuit
If the supply voltage exceeds the supply range of VBAT, the buck circuit should be used to meet
the demand of power supply. When choosing buck chip, besides considering the maximum current
output capability of IC to meet the demand of SIM7080G, it is also necessary to consider the low
static power consumption of IC in PSM mode.
4.5V~5.5V
22uF
EN
TPS62088
SW
FB
VIN
EN
GND
PG
22uF
22uF 120pF
1MR
5.36MR
3.8V
0.24uH
100KR
100uF
100uF
Figure 7: power supply reference circuit
3.1.3 Voltage Monitor
To monitor the VBAT voltage, the AT command “AT+CBC” can be used.
AT command “AT+CBATCHK=1” can be used to enable the overvoltage warning function and the
under-voltage warning function.The default value of the overvoltagewarning function in the
software is 4.85V, and the default value of the under-voltagewarning function is 2.8V. If the power
supply for VBAT pins is up 4.85V or under 2.8V, module will be warning.