EMAC PCM-3292, Руководство пользователя

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8.0 Appendix Agenda
The core engine of PCM-3292 is CT5510.
The design of CT5510 emphasizes on compact overall physical dimension
and fast fix time. To accomplish these traits, CT5510 was designed not to carry
a capacitor or backup battery onboard. This application notes will demonstrate
on ways to efficiently manage the power consumption of CT5510 and achieve fast
start/fix time.
Power saving methods
1. Using the “Sleep” mode and PWRDOWN command
2. Using the INITAID (Initial position and time aiding) command
Advantages:
8.1.1PWRDOWN command procedure:
Using the sleep mode is recommended when navigation isn’t needed, since
CT5510 consumes remarkably little power in the sleep mode and still re-acquires
the navigation fix quickly after waking up.
CT5510 consume between 70
μ
A to 100
μ
A during sleep mode, comparing
to 50mA in navigation mode.
INITAID command procedure:
Setting this information before starting navigating with the
$PFST,START command reduces the time required for finding the satellites
and receiving the first valid navigation fix. Therefore, CT5510 achieves fast
starting time that’s comparable to modules that have battery backup units.
(Note: comparing to the PWRDOWN command procedure,
INITAID command requires the complete shut down of power
supply, including the antenna.)