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GPS Location Saving System Hardware Review

GPS Location Saving System Hardware Review. WWU Taylor Reijm. GPS Location Saving System Full Schematic. NXP LPC2378 ARM7 MCU. LPC2378 32-bit MCU 512kB Flash Memory 144-pin 20MHz oscillator Used to control TFT touch screen LCD and LCD controller.

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GPS Location Saving System Hardware Review

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  1. GPS Location Saving System Hardware Review WWU Taylor Reijm

  2. GPS Location Saving System Full Schematic

  3. NXP LPC2378 ARM7 MCU LPC2378 32-bit MCU 512kB Flash Memory 144-pin 20MHz oscillator Used to control TFT touch screen LCD and LCD controller. 1 GPIO used for automatic power off circuitry RXD3 and TXD3 used to interface with GPS Receiver.

  4. Power Supply Circuitry 7.2V NiMH battery with 3000mA hrs. IRFZ44N VGS=2Vto start conduction. VGS=0V to end conduction. GPIO and SW2 used to control conduction ATPS006A0X Pico TLynx DC-DC switching power module. • Fixed Switching Frequency • Remote On/Off • 4.5Vdc-14Vdc • 6A Trim resistance used to get output of 5V • RTRIM=[5.91/(Vo -0.591)]k ohms • RTRIM(5V)=1.34k ohms • NCP1117 • 18V max in • 3.3V out • 800mA output current

  5. TFT LCD and Controller ADS7843- Touch screen controller 12 bit ADC with synchronous serial interface Comes connected as shown from Gravitech ELT240320TP-TFT LCD Thin Film Transistor Touch screen interface 2.8” screen 240x320 pixels. Backlight control Cap Sense O/P

  6. Reset Circuitry Active low reset

  7. Oscillator and EEPROM Oscillator 20MHz oscillator with enable tied to 3.3V supply EEPROM 8kB I2C interface w/LPC2378

  8. GPS Receiver EM-406A • 4800 baud NMEA 0183 output • 4.5V~6.5V DC input supply • ~44mA • O/P voltage level 0V to 2.85V • One Pulse Per Second not used.

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