Navika-Exd

Application platform with GPS
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Features  
  • ARM7 processing core at 90MHz
  • Integrated, high performance GPS engine
    • 16 parallel GPS channels for Acquisition and Tracking
    • Capable of indoor positioning
    • Extremely fast fix times
  • 2Mbits of internal SRAM for applications
  • Rich set of peripheral support
    • USB 2.0 Full-speed
    • CAN 2.0 Controller
    • SPI with upto 7 slaves
    • Serial Port with I2S support
    • Two Wire Interface (I2C)
    • Sixteen GPIO
    • Three Timers
  • Multiple boot modes
  • 1” x 1.5” form-factor
  • Single 3.3V input supply
Navika-Exd
Product Description Brochure

Several applications require a processing platform that can perform multiple tasks, but keeping the platform size small and overall cost low. The Navika-Exd is a small form-factor, low cost platform based on Accord's AST-230 SoC and is capable of simultaneously supporting the needs of diverse applications.

The Navika-Exd also integrates Accord's GPS front-end and brings out the rich peripheral interfaces of the AST-230. This enables applications that require GPS based location services along with interfaces to communicate the information to the users.

The Navika-Exd makes use of Accord’s AST-GPSRF RF front end and AST-230 SoC.

The AST-GPSRF is a miniature GPS RF Front end designed for GPS C/A and Galileo OS band receivers. The RF chip has an in-built low noise amplifier (LNA), single down conversion stage, automatic gain controlled amplifier (AGC), on-chip IF band pass filter and a 2-bit analog-to-digital converter (ADC).

The AST-230 is a highly integrated SoC that combines the high performance of Accord's GPS baseband with the flexibility of ARM7 processing core. Several industry standard peripherals add value to user applications such as USB, CAN, SPI, GPIO, Serial Ports, Timers, TWI, RTC etc. AST-230 supports low power mode for portable applications.

Navika-Exd modules and evaluation kits are available now to customers.

Navika-Exd Module Details  

The Navika-Exd brings out some of the essential peripherals for host interface such as SPI port, TWI port, two UART ports, USB port and GPIO’s.
The Navika-Exd is targeted for applications that require positioning and/or timing outputs. In addition to the user co-ordinates, Navika-Exd is capable of delivering unmatched timing accuracy. Typical applications where Navika-Exd could be integrated are –

  • Vehicle tracking
  • Security
  • Geo-tagging
  • Wireless base-stations
The Navika-Exd is a 1”x1.5” sized GPS system on board. It requires a single 3.3V supply and a 1.2V battery feed that would enable the user to fully exploit all its features.

The module has been designed keeping all components on one side of the PCB and provides SMD pads at the bottom for electrical and mechanical connectivity.

The connection details and the mechanical information are provided below.

Navika-Exd – Connection Diagram  

In order to build a complete GPS receiver using the module, all it takes are a few connections. The diagram below depicts the interconnections to be done in order to use the Navika-Exd.

  • Connect a 50Ω trace between the RF_IN pad and the antenna connector
  • Connect a 20Ω 1W resistor between the ANT_SENSE and ANT_VCC_3V pads. This is required to sense a short circuit on the antenna power line as well as to protect the power-ground short circuit
  • An active low power ON reset of at least 25ms should be provided on the /RESET pad
  • The host communication can be tapped at the UART1_RXD and UART1_TXD lines
  • Since the AST-230 supports multiple boot modes, it is necessary to set the boot mode to boot from NOR flash. This can be done by properly terminating the BOOT_MODE_0 and BOOT_MODE_1 lines
  • Mains power of 3.3V +/- 5% should be applied at DVCC_3V3 pad. The maximum current draw of the board would be about 50mA (excluding antenna current). It is recommended to mount a decoupling capacitor of 1uF close to the DVCC_3V3 pad
  • A backup battery of 1.2V should be applied at VBAT_1V2 pad. The recharge circuitry (in case of a rechargeable battery) should be provisioned on the motherboard


Specifications of Navika-mini Module  
Processor
Processor core ARM7-TDMI
Instruction speed 90MHz
Host bus clock speed 45MHz (max)
Peripheral clock speed 22.5MHz (max)
 
GPS System Specifications
Channels 16 Acquisition, 16 Tracking
Acquisition Sensitivity
-155dBm (Hot start, 1SV @
-144dBm)
-160dBm (Reacquisition)
Tracking Sensitivity -160dBm
Hot Start TTFF(with valid ephemeris, almanac, position and time estimate) 1 sec (typical) switch OFF/ON cycle less than 1 hour
Warm Start TTFF(with almanac, position and time estimate) 35 sec (typical)
Cold Start TTFF(without almanac, time, or position) 40 sec (typical)
Position Accuracy 10 m (90% without S/A)
Velocity Accuracy 0.1 m/sec (90% without S/A)
1PPS Accuracy +/- 12ns (2s without errors)
Acquisition Sensitivity -162dBm
 
Memory
Internal Memory 2Mbits SRAM
Battery Backed 32Kbits SRAM
Expansion External SRAM / Serial Flash
 
SPI
Configuration CS, CLK, MOSI, MISO
Clock 22.5MHz
Slave selects Upto 7
 
TWI
Configuration SDA, SCLK
Data transfer 400Kbits / sec
 
UART
Configuration TX, RX (2 sets)
Baud Rate Up to 1Mbps
Message Formats 5, 6, 8 data bits, even / odd parity
 
USB
Configuration Full-SpeedDM, DP, VBUS
Functionality Device
Endpoints Control endpoint: 1RX endpoints: 7TX endpoints: 7
 
GPIO
Configuration Upto 16 GPIO (multiplexed with SPI Slave selects)
Features Independently programmable as input or outputCapable of detecting external edge / level sensitive interrupts
 
Others
Antenna Sense AST-400 can sense an open circuit on the active antenna line by monitoring the drop across an external resistor. The value of the resistor needs to be designed in accordance with the antenna current.
 
Electrical
Supply Current 50mA @ 3.3V
Battery Current 8mA @ 1.2V
 
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