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Multi Spider - ORG4572 Datasheet

Revision 3.0

November 23, 2014

15.3.3. ADVANCED POWER MANAGEMENT (APM™)

APM™ allows power savings while ensuring that the Quality of the Solution (QoS) in maintained

when signals level drop.

In APM™ mode the module is intelligently cycled between Full Power and Hibernate states.

In addition to setting the position report interval, a QoS specification is available that sets

allowable error estimates and selects priorities between position report interval and more

power saving.

User may select between Duty Cycle Priority for more power saving and Time Between Fixes

(TBF) priority with defined or undefined maximum horizontal error.

TBF range is from 10s to 180s between fixes, Power Duty Cycle range is between 5% to 100%.

Maximum position error is configurable between 1 to 160m.

The number of APM™ fixes is configurable up to 255 or set to continuous.

FIGURE 5 – APM™ TIMING

15.3.4. SiRFAWARE® MICRO POWER MODE (MPM™)

While in SiRFAware® MPM™ ORG4572 determines how much signal processing to do and how

often to do it, so that the module is always able to do Hot start (TTFF < 2 s) on demand.

Module will wake up (typically twice an hour) for 18-24s to collect new satellite ephemeris data.

Ephemeris Data Collection operation consumes power equal to Full Power Tracking state.

Additionally, ORG4572 will wake up once every 1 to 10 minutes for 250ms to update internal

navigation state and clocks calibration. Update operation consumes about 0.2mA, rest of time

module stays in Hibernate state, drawing ≤ 54µA of current.

Host toggles ON_OFF to wake-up module and initiates fix trial.

After valid fix is available, host can turn ORG4572 back into MPM™ by re-sending the command.

Average current consumption over long period during MPM™ is about 0.5mA.

Hibernate

≤ 45s

0.25s

Time

Power On

18-24s

60m

1-10m

User position request

≤ 2s

FIGURE 6 – MPM™ TIMING

Notes:

1. GPS signal level drops (e.g. user walks indoor).

2. Lower signal results in longer ON time. To maintain Duty Cycle Priority, OFF time is increased.

3. Lower signal means missed fix. To maintain future TBFs module goes Full Power state until signal levels improve.