EM357 ZigBee chips from Ember are the industry’s first ARM Cortex-M3 based family of SoCs delivering unmatched performance, power consumption and code density in a compact package. The EM357 combine a 2.4 GHz IEEE 802.15.4 radio transceiver with a 32-bit microprocessor, Flash memory and RAM with powerful hardware supported network-level debugging features. This, combined with the powerful ecosystem of ARM tools, enables OEMs to simplify development and accelerate time to market.

The EM300 family is tightly integrated with EmberZNet PRO, Ember’s ZigBee compliant mesh networking software which is the most deployed ZigBee platform in the market.


Integrates a programmable ARM Cortex-M3 processor, IEEE 802.15.4 RF radio transceiver. Optimized for applications that require more memory, it has 192 kB Flash and 12KB RAM EmberZNet PRO network protocol stack supporting the ZigBee PRO Feature Set.

General Characteristics

  • Deep Sleep Current (with sleep timer running) 1uA max
  • RX Current 26mA
  • TX Current 31mA at +3 dBm
  • Crystal Frequency 24MHz
  • Operating Temperature Range -40° to +85° C
  • Voltage (internal reg) 2.1 to 3.6V
  • Package 7mm x 7mm, 48QFN

RF Characteristics

  • Data Rate 250kBps
  • Frequency range 2400MHz to 2500MHz
  • 16 total 5 MHz Channels
  • Typical RX Sensitivity -100dBm – Normal mode
  • 102dBm – Boost mode
  • Adj Channel rejection (802.15.4) 35dB
  • Alt Channel rejection (802.15.4) 46dB
  • 802.11g rejection 36dB
  • TX Power -55dBm to 3dBm – Normal mode
  • up to 8dBm- Boost mode
  • Total link budget Up to 110dB
  • Micro Characteristics
  • Operating Fequency 12MHz


  • EM357 – 192kB
  • RAM 12kB

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