design and development of mobile phone using modem, graphical lcd, buzzer and touchscreen based...

8/3/2019 Design and Development of Mobile Phone Using Modem, Graphical Lcd, Buzzer and Touchscreen Based Keypad

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Description of various blocks in block diagram:

Power Supply Unit:

Power supply unit is used to provide a constant 5Volts, 1.5Amp supply to

different ICs. This is a standard circuit using external 12V DC adopter and fixed 3-pin

voltage regulator.

AVR Microcontroller:

The ATmega32 is a low-power CMOS 8-bit microcontroller based on the AVR

enhanced RISC architecture. By executing powerful instructions in a single clock cycle,

the ATmega32 achieves throughputs approaching 1 MIPS per MHz (max. 16MHz)

allowing the system designer to optimize power consumption versus processing speed,

Which provides features like 32K bytes of In-System Programmable Flash Program

memory with Read-While-Write capabilities, 1024 bytes EEPROM, 2K byte SRAM, 32general purpose I/O lines, 32 general purpose working registers, a JTAG interface for

Boundary-scan, On-chip Debugging support and programming, three flexible

Timer/Counters with compare modes, Internal and External Interrupts, a serial

programmable USART, a byte oriented Two-wire Serial Interface, an 8-channel, 10-bitADC with optional differential input stage with programmable gain, a programmable

Watchdog Timer with Internal Oscillator, an SPI serial port, and six software selectable

power saving modes.

LCD display unit(PCD8544)

Generation of LCD supply voltage (external supply The PCD8544 is a low power

CMOS LCD controller/driver, designed to drive a graphic display of 48 rows and84

columns. All necessary functions for the display are provided in a single chip, including

on-chip generation of LCD supply and bias voltages, resulting in a minimum of external

components and low power consumption.

Touch Screen:

A touch screen is a display that can detect the presence and location of a touchwithin the display area. The term generally refers to touch or contact to the display of the

device by a finger. Touch screens can also sense other passive objects, such as a stylus.

However, if the object sensed is active, as with a light pen, the term touch screen is




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CONTACT: 9491535690, 7842358459

generally not applicable. The ability to interact directly with a display typically indicates

the presence of a touch screen.

The touch screen has two main attributes. First, it enables one to interact with

what is displayed directly on the screen, where it is displayed, rather than indirectly with

a mouse or touchpad. Secondly, it lets one do so without requiring any intermediate

device, again, such as a stylus that needs to be held in the hand. Such displays can be

attached to computers or, as terminals, to networks. They also play a prominent role in

the design of digital appliances such as the personal digital assistant (PDA), satellite

navigation devices, mobile phones, and video games.

Block diagram:




CONTACT: 9491535690, 7842358459


CONTACT: 9491535690, 7842358459

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