Board Info

Pin Definitions

BOOT 3V3 GND PIN RXD TXD

Power supply

• 3V3 500mA
• Logic level is the sme 3V3

Common Debug Error

• you must use NBIOT Card, normal phone card may not work
• if the card no service, system will shut power at CREG 0,2

PSM Mode

• AT commands to enter into PSM power save mode
• pull down RTC_EINT or PWR_KEY to quit PSM mode

Dimension / Pins / Schematic

reference

• SIM7020 info : https://github.com/Edragon/SIMCOM_SIM7020
• SIMCOM-AT