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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:

  • 80MHz Arm® Cortex®-M33 processor;
  • Flash memory 1024KB;
  • SRAM 96KB;
  • Transmitter output power up to +20 dBm;
  • Supply voltage 3.3V;
  • The current consumption in the active mode is not more than 200 mA.
  • Overall dimensions of the module: 28 x 18 mm.

The module is based on the circuitry of the Silabs EFR32xG21 (BRD4180B) debug board based on the EFR32MG21 chip:

Module Pin 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 pin assignment:

Module Output Purpose microcontroller output
one 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)
eight PC04 PC04 (5)
nine GND
ten not connected
eleven not connected
12 not connected
thirteen +3.3V
fourteen GND
fifteen RESET RESET (9)
sixteen PA6/RX PA06(23)
17 PA5/TX PA05(22)
eighteen PA4/CTS PA04 (21)
nineteen 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: Software for sticks and modules based on the Silicon Labs EFR32MG21 chip

When using firmware from USB stick Z4:

  • There is a transition to the bootloader mode at a low logic level at the PB00 input.
  • 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 RTS/CTS flow control is not used.

Module flashing procedure

For instructions on flashing the module, see the documentation: Instructions for flashing microcontrollers EFR32MG21