A d v a nce d I n fo rm a t i o n

Eterna Datasheet

Linear Technology / Dust Networks

5

2.0

Introduction

Eterna is the world’s most energy-efficient IEEE 802.15.4 compliant platform enabling battery and energy harvested

endpoint, routing and network management solutions. With a powerful 32-bit ARM

RAM and purpose-built peripherals, Eterna provides a flexible, scalable and robust networking solution for applications

demanding both minimal energy consumption and data reliability in even the most challenging RF environments.

Shown in Figure 1, Eterna integrates purpose-built peripherals that excel in both low operating-energy consumption and the

ability to rapidly and precisely cycle between operating and low-power states. Items in the shaded region correspond to the

analog/RF components.

Cortex-M3

Timers

Sched.

Auto

MAC

AES

Flash

512 KB

Flash

Controller

802.15.4

Framing

DMA

802.15.4

Mod

802.15.4

Demod

API

UART

(6-pin)

IPCS

SPI

Slave

PTAT

PMU /

Clock

Control

Bat.

Load

SRAM

72 KB

Code

System

LNA

PA

BPF

PPF

PLL

RSSI

LPF

S

Analog Regulator

Clock Regulator

Core Regulator

Voltage Reference

Primary

DC/DC

Converter

PA

DC/DC

Converter

PoR

32 kHz

ADC

Ctrl.

10-bit

ADC

Relaxation

Oscillator

32 kHz, 20 MHz

4-bit

DAC

VGA

CLI

UART

(2 pin)

Limiter

ADC

DAC

AGC

Figure 1

Eterna Block Diagram

2.1

Power Supply

Eterna is powered from a single pin, VSUPPLY, which powers the I/O cells and is also used to generate internal supplies.

Eterna’s two on-chip DC/DC converters minimize Eterna’s energy consumption while the device is awake. To prevent power

from being wasted the DC/DC converter is disabled when the device is in low-power state. Eterna’s rejection of supply noise

is substantial owing to the two integrated DC/DC converters and three integrated low-dropout regulators. Eterna’s operating

over a broad temperature range.