EM342-RTR datasheet(21/143 Pages) SILABS

21 / 143 page

EM342

Rev 1.0

3. Functional Description

The EM342 is a fully integrated system-on-chip that integrates 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 RF4CE 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.

The EM342 has 128 kB of embedded flash memory. It has 12 kB of integrated RAM for data and program storage.

The Ember software for the EM342 employs an effective wear-leveling algorithm that optimizes the lifetime of the

embedded flash.

To maintain the strict timing requirements imposed by the ZigBee RF4CE and IEEE 802.15.4-2003 standards, the

EM342 integrates a number of MAC functions, AES128 encryption accelerator, and automatic CRC handling into

the hardware. The MAC hardware handles automatic ACK transmission and reception, automatic backoff delay,

and clear channel assessment for transmission, as well as automatic filtering of received packets. The Ember

Packet Trace Interface is also integrated with the MAC, allowing complete, non-intrusive capture of all packets to

and from the EM342 with Ember development tools.

The EM342 offers a number of advanced power management features that enable long battery life. A high-

frequency internal RC oscillator allows the processor core to begin code execution quickly upon waking. Various

deep sleep modes are available with less than 1 µA power consumption while retaining RAM contents. To support

user-defined applications, on-chip peripherals include UART, SPI (slave only), as well as up to 16 GPIOs.

Additionally, an integrated voltage regulator, power-on-reset circuit, and sleep timer are available.

Finally, the EM342 utilizes standard Serial Wire and JTAG interfaces for powerful software debugging and

programming of the ARM Cortex

-M3 core. The EM342 integrates the standard ARM system debug components:

Flash Patch and Breakpoint (FPB), Data Watchpoint and Trace (DWT), and Instrumentation Trace Macrocell (ITM).

Target applications for the EM342 are ZigBee RF4CE target devices using the ZigBee Remote Control profile.

The technical data sheet details the EM342 features available to customers using it with Ember software.

EM342-RTR Datasheet(PDF) 21 Page - Silicon Laboratories