a seminar on analog to digital converter....which converts analog data to digital data....

1. ADC
in LPC 2148 ARM Controller

2. LPC 2148 Microcontroller
LPC 2148 is very useful especially when it comes to
communicate with other devices

3. Basic analog to digital conversion

4. What is ADC & its Resolution?
 ADC is used to convert analog signal into its equivalent digital
number.
 The Resolution of ADC indicates the number of digital values.
 In LPC 2148 for 10 bit ADC resolution is 10 bit and maximum
value will be 1024.therfore digital value lies between 0 to 1023.
 Step size is minimum change in input voltage. which is related
to with resolution of ADC.

5.  ADC in LPC 2148 microcontroller is 10 bit. Features
are listed below
 LPC 2148 has 2 inbuilt ADC module named as ADC0
& ADC1.
 ADC operating frequency is 4.5MHz.
 Supports power down mode.
 Burst conversion mode.
 There are several register associated but we maily
discuss about ADC Control Register(ADCR) & ADC
Global Data Register(ADGCR).
Introduction: ADC in LPC2148 ARM7 Microcontroller

6. Pin description
• Lets have look at the table which illustrates ADC related
channels & pins.

7. Register description in ADC
• Register Name Function:-
• ADCRA/D Control Register: The ADCR register must be written to
select the operating mode before A/D conversion can occurs.
• ADGDRA/D Global Data Register: This register contains
ADC’s DONE bit and the result of the most recent A/D conversion.
• ADSTATA/D Status Register: This register contains DONE and
OVERRUN flag for all the A/D Channels, as well as the A/D interrupt
flag.
• ADGSRA/D Global Start Register: This address can be written (in
the AD0 address range) to start conversions in both A/D converters
simultaneously.
• ADINTENA/D Interrupt Enable Register: This register contains
enable bits that allow the DONE flag of each A/D channel to be
included or excluded from contributing to the generation of an A/D
interrupt.
• ADDRxA/D Channel x Data: ‘x’ varies from 0 to 7