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https://www.electrodragon.com/product/a7670-lte-cat-1-gsm-mini-module/?attribute_pa_simcom=a7670c
Hardware
- Hold down reset button for 2 seconds to boot the module
- pull up reset pin for 2 seconds to boot the module (by external MCU)
Pin Definitions
- RST
- GND
- PEN
- RXD
- TXD
- ~RI
- DTR
- 3V3
- VIN
- VBUS
Note
- When use VIN input, UART serial logic level power +5V should be supplied via VUSB
Power Supply
- VBUS can be a USB power supply.
- VIN can be ~18V 2A external DC power supply
- VBAT does not lead out, so you basically can not use it unless you hack with a jumper wire. Please note we didn't mention the board can use VBAT in the product description.
- 3.3V for on board logic or power external
Wiring UART communication with ESP32
| ESP32 | note | A7670 |
|---|---|---|
| IO18 IO19 | UART | A7670C |
| Vin / Vusb | Logic Level | A7670C logic |
| Vin / Vusb | Power Supply | A7670C Power Supply |
