32-bit ARM® Cortex-M3 microprocessor

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The EM357 is fully integrated system-on-chips that integrate a 2.4 GHz, IEEE 802.15.4-2003-compliant transceiver, 32-bit ARM® Cortex-M3 microprocessor, flash and RAM memory, and peripherals of use to designers of ZigBee-based systems.

The transceiver uses an efficient architecture that exceeds the dynamic range requirements imposed by the IEEE 802.15.4-2003 standard by over 15 dB. The integrated receive channel filtering allows for robust co-existence with other communication standards in the 2.4 GHz spectrum, such as IEEE 802.11-2007 and Bluetooth. The integrated regulator, VCO, loop filter, and power amplifier keep the external component count low. An optional high performance radio mode (boost mode) is software-selectable to boost dynamic range.

The integrated 32-bit ARM® Cortex-M3 microprocessor is highly optimized for high performance, low power consumption, and efficient memory utilization. Including an integrated MPU, it supports two different modes of operation—privileged mode and user mode. This architecture could allow for separation of the networking stack from the application code, and prevents unwanted modification of restricted areas of memory and registers resulting in increased stability and reliability of deployed solutions.

Symmetry Electronics is an authorized Silicon Labs distributor.


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32-bit ARM Cortex-M3 processor
2.4 GHz IEEE 802.15.4-2003 transceiver & lower MAC
128 or 192 kB flash, with optional read protection
12 kB RAM memory
AES128 encryption accelerator
Flexible ADC, UART/SPI/TWI serial communications, and general purpose timers
24 highly configurable GPIOs with Schmitt trigger inputs


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Silicon Labs Datasheet

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