Sunsea AIoT SIMCom SIM7075G User Manual page 22

3.1.1 Power Supply Design Guide
In the user's design, special attention must be paid to the design of the power supply section to ensure that
the VBAT drop cannot be lower than the minimum voltage shown in Table 7 even when the module current
consumption reaches the instantaneous maximum. If the VBAT voltage drops below the minimum input
voltage, the module may shut down due to low voltage.
Table 7: Minimum input voltage
Module
SIM7075G
The figure 6 shows the recommended circuit.
In addition, for ESD protection, it is suggested to add a TVS diode near the VBAT PINs. These capacitors
should be put as close as possible to VBAT pads. Also, users should keep VBAT trace on circuit board
wider than 2 mm to minimize PCB trace impedance.
Table 8: Recommended TVS diode list
No. Manufacturer
1 Prisemi
2 Prisemi
3 WILLsemi
NOTE
1. The customer's circuit design must have the function that the master can control the power off of the
module. The module can be shut down or restarted normally. Only when the module is abnormal and
cannot be shut down or restarted normally can the power be turned off.
2. When the module is working normally, do not cut off the power supply of the module VBAT directly to
avoid damage to the internal flash of the module. It is strongly recommended to turn off the module
through PWRKEY or AT command before disconnecting the module VBAT power.
www.simcom.com
Minimum input voltage(V)
3.3
Figure 6: Power supply application circuit
Part Number
PESDHC2FD4V5B
PESDHC3D3V3U
ESD5651N-2/TR
SIM7075G User Manual V1.00
Package
DFN1006
SOD323
DFN1006
22 / 74