LTP5901-WHM datasheet(21/32 Pages) LINER

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LTP5901-WHM/LTP5902-WHM

59012whmfa

For more information www.linear.com/LTP5901-WHM or www.linear.com/LTP5902-WHM

operaTion

TheLTP5901/LTP5902istheworld’smostenergy-efficient

IEEE 802.15.4 compliant platform, enabling battery and

energyharvestedapplications.Withapowerful32-bitARM

Cortex™-M3,best-in-classradio,flash,RAMandpurpose-

built peripherals, Eterna provides a flexible, scalable and

robust networking solution for applications demanding

minimal energy consumption and data reliability in even

the most challenging RF environments.

Shown in Figure 9, Eterna integrates purpose-built periph-

erals that excel in both low operating-energy consump-

tion and the ability to rapidly and precisely cycle between

operating and low-power states. Items in the gray shaded

region labeled “Analog Core” correspond to the analog/

RF components.

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’stwoon-chipDC/DCconvertersminimize

Eterna’s energy consumption while the device is awake. To

conserve power the DC/DC converters are disabled when

the device is in low-power state. Eterna’s power supply

conditioningarchitecture,includingthetwointegratedDC/

DC converters and three integrated low-dropout regula-

tors, provides excellent rejection of supply noise. Eterna’s

operating supply voltage range is high enough to support

direct connection to lithium-thionyl chloride Li-SOCl2

sources and wide enough to support battery operation

over a broad temperature range.

SUPPLY MONITORING AND RESET

Eterna integrates a Power-on reset (PoR) circuit. As the

RESETn input pin is nominally configured with an internal

pull-up resistor, no connection is required. For a graceful

shutdown, the software and the networking layers should

be cleanly halted via API commands prior to assertion

of the RESETn pin. See the SmartMesh WirelessHART

Mote API Guide for details on the disconnect and reset

commands. Eterna includes a soft brown-out monitor that

fully protects the flash from corruption in the event that

power is removed while writing to flash. Integrated flash

supervisoryfunctionality,inconjunctionwithafaulttolerant

file system, yields a robust non-volatile storage solution.

PRECISION TIMING

A major feature of Eterna over competing 802.15.4 prod-

uct offerings is its low-power dedicated timing hardware

and timing algorithms. This functionality provides timing

precision two to three orders of magnitude better than

any other low-power solution available at the time of

publication. Improved timing accuracy allows motes to

minimize the amount of radio listening time required to

ensure packet reception thereby lowering even further

the power consumed by SmartMesh networks. Eterna’s

patented timing hardware and timing algorithms provide

superior performance over rapid temperature changes,

further differentiating Eterna’s reliability when compared

with other wireless products. In addition, precise timing

enables networks to reduce spectral dead time, increasing

total network throughput.

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