Maestro A2200-A User Manual download pdf (Page 31)

V1.0 – Aug-13

User’s Manual

Page 31 of 37

10 Applications and Hints

10.1 Initial Module Start

After initially applying power to the module, it is necessary to start the internal firm-

ware by toggling the ON_OFF pin. Toggling is done by pulling the signal to HIGH for

about 200ms. This first toggling can be done after a LOW – HIGH transmission was

detected at the WAKEUP pin or by simply waiting for 1s after power-up. In UART

mode, output messages should immediately be displayed. If no messages then a

new toggling should be applied.

10.2 Proper Shutdown and Power-On-Reset (POR)

The A2235-H modules require an orderly shutdown process to properly stop internal

operation and complete any writes of critical data to BBRAM or EEPROM data area.

Abrupt removal or drop of main power while the system is running has risks ranging

from minor impact on TTFF to fatal, permanent corruption of EEPROM code area on

the module (Please refer to “Power ONOFF Sequences and Power -On-Reset (POR)

on A2100-AB Application Notes”).

A controlled and orderly shutdown while the A2235-H is running in full power mode

can be initiated by

 A 200ms pulse on the ON_OFF pin,

 According messages either in NMEA or OSP mode.

The shutdown is completed after maximum 1s. Therefore the module should be

supplied with voltage for that time after the shutdown sequence was initiated.

10.3 SiRFaware

Support

SiRFaware

is a low-power operating mode that seeks to maintain low uncertainty

in position, time, and frequency, and to maintain valid current Ephemeris using either

data collected from satellites in view or Extended Ephemeris methods.

The SiRFaware

mode is entered using the One Socket Protocol, an extension of

the SiRF Binary Protocol. Please refer to the appropriate manual. In order to request

a fix and to exit SiRFaware

it is necessary to toggle the ON_OFF pin. Toggling is

done by pulling the signal to HIGH for about 200ms.

10.4 Push-to-Fix Mode

Push-to-Fix mode is designed for the application that requires infrequent position

reporting. The receiver generally stays in a low-power mode, up to 2 hours, but

wakes up periodically to refresh position, time, ephemeris data and RTC calibration.

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Maestro A2200-A User Manual Page 31