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LTP5901-IPM/LTP5902-IPM

59012ipmfa

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operaTion

Once software has been loaded, devices can be configured

via either the CLI or API ports. Configuration commands

and settings are defined in SmartMesh IP Mote API Guide

and SmartMesh IP Mote CLI Guide.

FLASH DATA RETENTION

Eterna contains internal flash (nonvolatile memory) to

store calibration results, unique ID, configuration settings

and software images. Flash retention over the operating

temperature range. See Electrical Characteristics and

Absolute Maximum Ratings sections.

Non destructive storage above the operating temperature

range of –40°C to 85°C is possible; although, this may

result in a degradation of retention characteristics.

The degradation in flash retention for temperatures >85°C

can be approximated by calculating the dimensionless

acceleration factor using the following equation.











•

TUSE+273

−

TSTRESS+273

























Where:

AF = acceleration factor

Ea = activation energy = 0.6eV

k = 8.625 • 10–5eV/°K

TUSE = is the specified temperature retention in °C

TSTRESS = actual storage temperature in °C

Example: Calculate the effect on retention when storing

at a temperature of 105°C.

TSTRESS = 105°C

TUSE = 85°C

AF = 2.8

So the overall retention of the flash would be degraded

by a factor of 2.8, reducing data retention from 20 years

at 85°C to 7.1 years at 105°C.

STATE DIAGRAM

In order to provide capabilities and flexibility in addition

to ultralow power, Eterna operates in various states, as

shown in Figure 11. Eterna State Diagram and described

in this section. State transitions shown in red are not

recommended.

Start-Up

Start-up occurs as a result of either crossing the power-on

reset threshold or asserting RESETn. After the completion

of power-on reset or the falling edge of an internally

synchronized RESETn, Eterna loads its fuse table which,

as described in the previous section, includes setting

I/O direction. In this state, Eterna checks the state of

the FLASH_P_ENn and RESETn and enters the serial

flash emulation mode if both signals are asserted. If the

FLASH_P_ENn pin is not asserted but RESETn isasserted,

Eterna automatically reduces its energy consumption to

a minimum until RESETn is released. Once RESETn is

de-asserted, Eterna goes through a boot sequence, and

then enters the active state.

Serial Flash Emulation

When both RESETn and FLASH_P_ENn are asserted,

Eterna disables normal operation and enters a mode to

emulate the operation of a serial flash. In this mode, its

flash can be programmed.

Operation

Once Eterna has completed start-up, Eterna transitions to

the operational group of states (active/CPU active, active/

CPU inactive, and Doze). There, Eterna cycles between the

various states, automatically selecting the lowest pos-

sible power state while fulfilling the demands of network

operation.

Active State

In the active state, Eterna’s relaxation oscillator is running

andperipheralsareenabledasneeded.TheARMCortex-M3

LTP5901-IPM Datasheet(PDF) 28 Page - Linear Technology

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