ADC0804 Pinout and Typical Connections

As shown in the typical circuit, ADC0804 can be interfaced with any microcontroller. You need a minimum of 11 pins to interface ADC0804, eight for data pins and 3 for control pins. As shown in the typical circuit the chip select pin can be made low if you are not using the microcontroller port for any other peripheral (multiplexing).

ADC0804 connection with microcontroller

There is a universal rule to find out how to use an IC. All you need is the datasheet of the IC you are working with and take a look at the timing diagram of the IC which shows how to send the data, which signal to assert and at what time the signal should be made high or low etc.

Note: Keep this in mind that whenever you are working with an IC and you want to know how to communicate with that IC, then simply look into the timing diagram of that IC from its datasheet. It gives you complete information that you need regarding the communication of IC.

ADC0804 Timing diagram - start of conversion
ADC0804 Timing diagram - reading ADC output

The above timing diagrams are from ADC0804 datasheet. The first diagram (FIGURE 10A) shows how to start a conversion. Also you can see which signals are to be asserted and at what time to start a conversion. So looking into the timing diagram FIGURE 10A. We note down the steps or say the order in which signals are to be asserted to start a conversion of ADC. As we have decided to make Chip select pin as low so we need not to bother about the CS signal in the timing diagram. Below steps are for starting an ADC conversion. I am also including CS signal to give you a clear picture. While programming we will not use this signal.

  1. Make chip select (CS) signal low.
  2. Make write (WR) signal low.
  3. Make chip select (CS) high.
  4. Wait for INTR pin to go low (means conversion ends).

Once the conversion in ADC is done, the data is available in the output latch of the ADC. Looking at the FIGURE 10B which shows the timing diagram of how to read the converted value from the output latch of the ADC. Data of the new conversion is only avalable for reading after ADC0804 made INTR pin low or say when the conversion is over. Below are the stepts to read output from the ADC0804.

  1. Make chip select (CS) pin low.
  2. Make read (RD) signal low.
  3. Read the data from port where ADC is connected.
  4. Make read (RD) signal high.
  5. Make chip select (CS) high.


In the next section of this tutorial we will follow the above mentioned steps to program the ADC.

Forum Activity
pravin_35 Avatar
Posted By pravin_35
Thu Jul 24 2014, 08:19 AM
What kind of sample code are you looking for? any ...
nisargpatel Avatar
Posted By nisargpatel
Thu Jul 24 2014, 06:35 AM
yes ds1307 keeps time on same crystal 32.76.. but ...
pravin_35 Avatar
Posted By pravin_35
Thu Jul 24 2014, 04:35 AM
Does the DS1307 keep time ?That is, if you set it ...
pravin_35 Avatar
Posted By pravin_35
Thu Jul 24 2014, 04:31 AM
what tool is it exactly? usually parallel program ...
Anup Teke Avatar
Posted By Anup Teke
Thu Jul 24 2014, 01:08 AM
Ajay Sir,CHannel 0 Register is 24 Bit. it register...
ajay_bhargav Avatar
Posted By ajay_bhargav
Thu Jul 24 2014, 01:05 AM
what tool is it exactly? usually parallel program ...
ajay_bhargav Avatar
Posted By ajay_bhargav
Thu Jul 24 2014, 01:02 AM
yes you should better ground D0 to D3 if not used....
ajay_bhargav Avatar
Posted By ajay_bhargav
Thu Jul 24 2014, 01:00 AM
What kind of sample code are you looking for? any ...
ajay_bhargav Avatar
Posted By ajay_bhargav
Thu Jul 24 2014, 12:57 AM
I really do not understand why are you reading reg...
pravin_35 Avatar
Posted By pravin_35
Thu Jul 24 2014, 12:11 AM
What PIC is it ?Does your programmer see the PIC a...

Conversation

ajay_bhargav
Thu Jul 24 2014, 01:06 AM
@R.ABHISHEK where? I dont see it. is it in forum?
Wed Jul 23 2014, 05:49 AM
R.ABHISHEK
sir,pls message on microcontroller 8051 assambly language new program
Wed Jul 23 2014, 05:47 AM
R.ABHISHEK
sir,pls message on 8051 microcontroller assambly language program new quastions
ajay_bhargav
Tue Jul 22 2014, 09:18 AM
@Pragya Android application is taken from google play. Only Author has its source with him. Application is only used in this project.
Tue Jul 22 2014, 04:58 AM
Pragya
plz send me 8051 code and android code for android based device controller via Bluetooth .Here in this project I am using Hc-06 Bluetooth module
Thu Jul 10 2014, 09:57 AM
Caleb
plz someone mail me the source code for that project
Thu Jul 10 2014, 09:57 AM
Caleb
http://www.8051projects.net/download-d188-control-your-pc-tv-remote.html
ExperimenterUK
Tue Jul 08 2014, 03:25 PM
Post questions in the forum.. this area is for chat
Tue Jul 08 2014, 08:15 AM
P.Panchanyam
Sir i want some new ideas for my final year projects ,which would help for our soceity in future
Tue Jul 08 2014, 01:39 AM
jasvinder
Dear Sir Ref. to the discussion held with under sign, the detail is as under--- We are in weighing scale field since 1986. We are assembling the scales by purchasing the material from out source ( From India and other countries). Now we decide to make our own Card in our decided shape. So we want to develop a universal card , which we can make all types of scales of up 100000 counts with 7 segment LED Display . Also with other features like Printing, Counting, RS232 Etc. And Three Pass words at different levels. And we can edit the Softwear. What else you can provide in this field, also mention. We will pay you the development , softwear and testing charges. And up-gradation charges at time to time. Our web site is modern-scales.com Kindly revert.

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vinosentinal
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