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LTP5901-IPR/LTP5902-IPR

59012iprfa

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network optimization not only maintains network health,

but also allows Eterna to deliver deterministic power

management. One of the key advantages of SmartMesh

networking solutions is the network manager is aware of

and tracking the success or failure of every packet trans-

action, so not only can the network be optimized, but the

solution can be rigorously tested to produce a system

solution with better than 99.999% reliability.

Deterministic Power Management

Deterministic power management balances traffic in the

network by diverting traffic around heavily loaded motes

(for example, motes with high reporting rates). In do-

ing so, it reduces power consumption for these motes

and balances power consumption across the network.

Deterministic power management provides predictable

maintenance schedules to prevent down time and lower

the cost of network ownership. When combined with field

devices using Eterna’s industry-leading low power radio

technology,deterministicpowermanagementenablesover

a decade of battery life for network motes.

Intelligent Routing

Intelligent routing provides each packet with an optimal

path through the network. The shortest distance between

two points is a straight line, but in RF the quickest path is

notalwaystheonewiththefewesthops.Intelligentrouting

finds optimal paths by considering the link quality (one

path may lose more packets than another) and the retry

schedule, in addition to the number of hops. The result

is reduced network power consumption, elimination of

in-network collisions, and unmatched network scalability

and reliability.

Configurable Bandwidth Allocation

SmartMesh networks provide configurations that enable

users to make bandwidth and latency versus power trade-

offs both network-wide and on a per device basis. This

flexibly enables solutions that tailored to the application

requirements, such as request/response, fast file trans-

fer, and alerting. Relevant configuration parameters are

described in the SmartMesh IP Users Guide. The design

trade-offs between network performance and current

consumption are supported via the SmartMesh Power

and Performance Estimator.

IP Manager Options

The IP Manager can operate with or without external

SRAM, as described in the LTP5901 and LTP5902 Inte-

gration Guide. When used without external SRAM, the IP

manager is limited to managing networks of 32 motes

or fewer and is limited to a maximum packet throughput

of 24 packets per second. With external SRAM, the IP

Manager supports managing networks of up to 100 motes

and the packet throughput of the IP Manager increases

from 24 packets per second to 36 packets per second.

State Diagram

In order to provide capabilities and flexibility in addition

to ultra low power, Eterna operates in various states, as

shown in Figure 12 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 comple-

tion 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 is asserted,

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.

operaTion

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