Table of Contents
JetHome Zigbee module ZB4C v.1 (EFR32MG21)
The module is designed to work as a Zigbee coordinator or end device as part of a Smart Home controller with the appropriate software installed and configured.
The module is based on a modern Silicon Labs EFR32MG21A020F1024IM32 wireless microcontroller for the 2.4GHz band and features high performance, increased transmitter output power and compact size.
Main technical characteristics:
- 80МГц processor Arm® Cortex®-M33;
- Flash memory 1024KB;
- SRAM 96KB;
- Transmitter output power up to +20 dBm;
- Supply voltage 3.3V;
- Current consumption in active mode up to 200 mА.
- Overall dimensions of the module 28 х 18 mm.
The module is based on the schematics of the Silabs EFR32xG21 (BRD4180B) debug board based on the EFR32MG21 chip:
Module pins assignment
The module is made in the format of a unified JetHome wireless module 28 x 18 mm in size with contacts located along the perimeter of the module. Top view of the module:
Module pins assignment:
| Pin | Function | MCU pin |
|---|---|---|
| 1 | SWCLK | PA01 (18) |
| 2 | SWDIO | PA02 (19) |
| 3 | SWO | PA03 (20) |
| 4 | PA00 | PA00 (17) |
| 5 | PD02 | PD02 (30) |
| 6 | PD03 | PD03 (29) |
| 7 | PD04 | PD04 (28) |
| 8 | PC04 | PC04 (5) |
| 9 | GND | |
| 10 | Not connected | |
| 11 | Not connected | |
| 12 | Not connected | |
| 13 | +3.3V | |
| 14 | GND | |
| 15 | RESET | RESET (9) |
| 16 | PA6/RX | PA06 (23) |
| 17 | PA5/TX | PA05 (22) |
| 18 | PA4/CTS | PA04 (21) |
| 19 | PC1/RTS | PC01 (2) |
| 20 | PB0/BOOT | PB00 (16) |
| 21 | GND | |
| 22 | Antenna | |
| 23 | GND |
Supported firmware
For information on supported firmware, see the documentation: ПО стиков и модулей, основанных на чипе Silicon Labs EFR32MG21
When using firmware from USB stick Z4:
- Provides a transition to the bootloader mode at a low logic level at the input PB00.
- It is possible to connect LEDs to indicate the operating mode: PD02 (red LED) and PD03 (green LED). A high logic level on these pins lights the corresponding LED.
- The UART TX line is output to PA05, UART RX - PA06. Hardware flow control RTS/CTS is not used.
Module flashing procedure
For instructions on flashing the module, see the documentation: Инструкция по прошивке микроконтроллеров EFR32MG21