Data Sheet

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2. Product Description
2.1 Description
REX3B is a compact, high-sensitivity low-power ZigBee module that complies with the IEEE
802.15.4 specification and the ZigBee 3.0 protocol standard. Based on the latest EFR32 platform
from US Silabs, it has extremely excellent RF performance, extremely low power consumption,
powerful processor and abundant on-chip resources, and it is very easy for user integration.
Figure 2-1. Chart
The REX3B module complies with the FCC, IC, and CE specifications and can be used in a
variety of devices in different environments. Moreover, the module is RoHS compliant.
2.4GHz
Radio
O-QPSK
Modem
IEEE802.15.4
MA C
Accelerator
Encryption
Accelerator
Pow er
Management
Data RAM
32kB
Program Flash
256kB
ARM CORTEX-M4®
CPU w ith NVIC and
MPU
SPI
TWI
Timers
UART
GPIO
registers
Cortex M4 Core
Antenna
Matching
Netw ork
XTAL (Crystal Frequency 38.4MHz)
Internal
Oscillators