ORG4572-R01-UAR datasheet(33/40 Pages) ETC

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Multi Spider - ORG4572 Datasheet

Revision 3.0

November 23, 2014

21.2. AUTONOMOUS POWER ON

Connecting WAKEUP output (pad 4) to ON_OFF input (pad 9) enables self-start to Full Power state

from Ready-To-Start state following boot process.

When host data interface is set UART, module will start autonomously transmitting NMEA messages

after first power supply application. Further transfers between Full Power and Hibernate states

require external logic circuitry combined with serial command.

21.3. VERIFYING THE MODULE HAS STARTED

WAKEUP output will go high indicating ORG4572 has started.

System activity indication depends upon selected serial interface.

The first message to come out of module is “OK_TO_SEND” - ‘$PSRF150,1*3E’.

21.3.1. UART

When active, the module will output NMEA messages at the 4800bps.

21.3.2. I²C

In Multi-Master mode with no bus contention - the module will spontaneously send messages.

In Multi-Master mode with bus contention - the module will send messages after the I²C bus

contention resolution process allows it to send.

21.3.3. SPI

Since ORG4572 is SPI slave device, there is no possible indication of system “ready” through SPI

interface. Host must initiate SPI connection approximately 1s after WAKEUP output goes high.

21.4. CHANGING PROTOCOL AND BAUD RATE

Protocol and baud rate can be changed by NMEA $PSRF100 serial message.

21.5. CHANGING SATELLITE CONSTELLATION

Satellite constellations used in position solution can be changed by OSP® Message ID 222 Sub ID 16.

21.6. SHUTTING DOWN THE MODULE

Transferring ORG4572 from Full Power state to Hibernate state can be initiated in two ways:

By a pulse on ON_OFF input.

By NMEA ($PSRF117) or OSP® (MID205) serial message.

Orderly shutdown process may take anywhere from 10ms to 900ms to complete, depending upon

operation in progress and messages pending, and hence is dependent upon serial interface speed and

controls. ORG4572 will stay in Full Power state until TX FIFO buffer is emptied.

The last message during shutdown sequence is ‘$PSRF150,0*3F’.

Note:

1. Changes to default firmware settings are volatile and will be discarded at power re-cycle.

ORG4572-R01-UAR Scheda tecnica(PDF) 33 Page - List of Unclassifed Manufacturers