EM357-RTR datasheet(2/240 Pages) ETC2

2 / 240 page

EM351 / EM357

General Description

The EM351 and EM357 are 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.

The EM351 has 128 kB of embedded flash memory and the EM357 has 192 kB of embedded flash memory. Both

chips have 12 kB of integrated RAM for data and program storage. The Ember software for the EM35x employs

an effective wear-leveling algorithm that optimizes the lifetime of the embedded flash.

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

EM35x 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 EM35x with Ember’s InSight development tools.

The EM35x 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, TWI, ADC, and general-purpose

timers, as well as up to 24 GPIOs. Additionally, an integrated voltage regulator, power-on-reset circuit, and

sleep timer are available.

Finally, the EM35x utilizes standard Serial Wire and JTAG interfaces for powerful software debugging and

programming of the ARM Cortex™-M3 core. The EM35x 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 EM35x include:

• Smart Energy

• Building automation and control

• Home automation and control

• Security and monitoring

• General ZigBee wireless sensor networking

This technical datasheet details the EM35x features available to customers using it with Ember software.

Preliminary

120-035X-000D

EM357-RTR 数据表(PDF) 2 Page - List of Unclassifed Manufacturers

EM357-RTR 数据表(HTML) 2 Page - List of Unclassifed Manufacturers

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