AC530 Fastrax, AC530 Datasheet - Page 9

• Manufacturer Part Number: AC530
• Description: GPS Development Tools Application Board for UC530
• Manufacturer: Fastrax

Specifications of AC530

• Rohs: yes
• Product: Application Boards
• Tool Is For Evaluation Of: UC530
• Frequency: 1.575 GHz
• Operating Supply Voltage: 3.3 V
• Interface Type: UART
• Description/function: Fastrax Application Board AC530 provides the UC530 connectivity to the Fastrax Evaluation Kit or to other evaluation purposes
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Operating Supply Current: 25 mA

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3 Operation
3.1
After power up the UC530 module boots from the internal ROM to Navigation Mode. Modes of operation:
3.2
The module will enter Full Power (aka Navigation Mode) after first power up with factory configuration settings.
Power consumption will vary depending on the amount of satellite acquisitions and number of satellites in track.
This Mode is also referenced as Full On, Full Power or Navigation Mode.
Navigation is available and any configuration settings are valid as long as the main VDD and backup VDD_B power
supplies are active. When the main VDD and backup VDD_B supply is powered off, settings are reset to factory
configuration and receiver performs a cold start on next power up.
Suggestion is to keep the backup supply VDD_B active all the time in order to sustain on time, position and
ephemeris in the backup RTC and RAM. The main VDD supply can be used to control the module activity, i.e. when
VDD is switched off, the module operation is stopped.
Navigation fix rate can be configured by a NMEA command, see chapter 0. Note that baud rate must be set high
enough or message payload low enough in order to pass through all messages pending.
3.2.1 Host port configuration
Default host port is configured to UART Port 0 by keeping GPIO9 and GPIO10 floating (not connected) during
power up. UART Port1 is reserved for DGPS/RTCM protocol.
Default protocol for host communication is NMEA at 9600 baud. Details on NMEA protocol can be found in NMEA
manual, ref (1). Default NMEA message output configuration: $GPGGA, $GPGSA, $GPGSV, $GPRMC and $GPVTG
rate every second. The module supports also proprietary $PMTK input commands, see ref (1). The message
payload
$PMTK000*32<CR><LF>. For clarity <CR><LF> are not displayed in the following example messages but should be
added to the payload at host.
3.3
The UC530 module supports also low power operating modes for reduced power consumption:
2012-05-03
UC530_Datasheet
1. Standby Mode: In this Mode the receiver stops navigation and internal processor enters standby state;
2. Backup Mode: In this mode the receiver is configured to enter autonomously to Backup State; the main
 Navigation Mode (Full Power)
 Standby Mode
 Backup State/Mode
 Reset State
Operating Modes
Full Power Mode
Power Management Modes
current drain at main supply VDD is reduced to 200 µA typ. Standby Mode is entered by sending NMEA
command: $PMTK161,0*28. Host can wake up the module from Standby Mode to Full Power Mode by
sending any byte via host port.
power supply VDD is controlled on/off externally by a power switch that is controlled by the TIMER signal
output, see reference circuit in chapter 7.1. In this mode the receiver stays in Backup state (backup supply
VDD_B active) while VDD supply is switched off. Backup Mode is entered by sending NMEA command:
$PMTK225,4*1C. Host can wake up the module by switching on the VDD supply e.g. via host control signal
GPS_ON signal toggle to high state (t>500ms), see reference circuit diagram in chapter 7.1.
consists
o
Power management system modes
of
$PMTK<cmd_id>,<data_field(s)>*<chk_sum><CR><LF>.
Sample
command: