Sunsea AIoT SimCom SIM7090G User Manual page 41

3.11 LDO output
SIM7090G has a LDO power output named VDD_EXT. The output voltage is 1.8V. This voltage can only be
pulled up for the external GPIO or power supply for the level conversion circuit.
Table 21: Electronic characteristic
Symbol Description
V Output voltage
VDD_EXT
I Output current
O
NOTE
The VDD_EXT is used to the IO power in the module. The Output voltage is not supported to adjust.
3.12 USB_BOOT Interface
SIM7090G provides a USB_BOOT pin for firmware upgrade during development or factory production.
Before the module powers up, pull USB_BOOT up to high level will force the module to boot from USB port.
Table 22: Pin Definition of USB_BOOT Interfaces
Pin Name Pin No.
USB_BOOT 87
www.simcom.com
Figure 22：Power on sequence of the VDD_EXT
Min.
1.75
-
I/O Description
Force the module to enter into
DI
emergency download mode.
SIM7090G User Manual V1.01
Typ. Max.
1.8 1.85
- 50
Comment
1.8V power domain.
Active high.
If unused, keep it open.
Unit
V
mA
41 / 77