What is ADC0808?

What is ADC0808?

ADC0808 is an 8 bit analog to digital converter with eight input analog channels, i.e., it can take eight different analog inputs. The input which is to be converted to digital form can be selected by using three address lines. The voltage reference can be set using the Vref+ and Vref- pins.

What is the step size of ADC 0808 if VREF+ is connected to 5V & VREF is connected to 1v?

ADC 0808 is an 8 bit ADC i.e. it divides the voltage applied at Vref+ & Vref- into 28 i.e. 256 steps. Step size= (5 – 0)/256= 19.53 mv.

What steps are followed while programming the ADC0808 0809?

While programming the ADC0808/0809 IC what steps are followed? Explanation: While programming the ADC0808/0809 IC firstly we need to select the channel from the A, B, C pins. Then we need to activate the ALE signal, this is needed to latch the address. Then we start the conversion from the WR pin.

What is the need of interfacing in 8051 microcontroller?

Interfacing is one of the important concepts in microcontroller 8051 because the microcontroller is a CPU that can perform some operation on a data and gives the output. However to perform the operation we need an input device to enter the data and in turn output device displays the results of the operation.

What is interfacing ADC with 8051?

ADC is the Analog to Digital converter, which converts analog data into digital format; usually it is used to convert analog voltage into digital format.

How interface ADC to 8051 explain in detail?

Steps to be followed to interface ADC (ADC0808) with 8051

1. Start.
2. Select the channel using Address pins.
3. A Low – High transition on ALE to latch in the address.
4. A Low – High transition on Start to reset the ADC’s SAR.
5. A High – Low transition on ALE.
6. A High – Low transition on start to start the conversion.

What is interfacing ADC?

The ADC 0808/0809 is an 8-bit analog to digital converter. It has 8 channel multiplexer to interface with the microprocessor. This chip is popular and widely used ADC. ADC 0808/0809 is a monolithic CMOS device. This device uses successive approximation technique to convert analog signal to digital form.

Which pins of Port 3 can be used for interfacing an external memory with 8051?

Pins 10 to 17 − These pins are known as Port 3. This port serves some functions like interrupts, timer input, control signals, serial communication signals RxD and TxD, etc. Pins 18 & 19 − These pins are used for interfacing an external crystal to get the system clock.

What is microcontroller interfacing?

Microcontroller Interfaces. An interface is the circuitry that connects an embedded controller to the outside world. RS-232/UART—This universal asynchronous receiver–transmitter is actually the physical circuitry implementing a popular serial interface standard referred to as RS-232.

What is interfacing why we need interfacing?

When we are executing any instruction, we need the microprocessor to access the memory for reading instruction codes and the data stored in the memory. The interfacing circuit therefore should be designed in such a way that it matches the memory signal requirements with the signals of the microprocessor.

What is interfacing used for?

Interfacing is a fabric which is used to make certain parts of a garment more stable. It is used as an additional layer which is applied to the inside of garments, such as collars, cuffs, waistbands and pockets, helping to add firmness, shape, structure, and support to the clothes.

What is adc0808 interfacing with-8051 microcontroller?

ADC0808 Interfacing with-8051 microcontroller ADC is the Analog to Digital converter, which converts analog data into digital format; usually it is used to convert analog voltage into digital format.

Can I use ADC 0808 with 8051?

Well. 8051 doesn’t have an inbuilt ADC. So we have to use external ADC. There are many ADCs available. One of the most commonly used ADC is ADC0808. ADC 0808 is a Successive approximation type with 8 channels i.e. it can directly access 8 single-ended analog signals. The difference between ADC0804 and ADC0808 is the number of analog input signals.

Why do we need external ADC for interfacing sensors to microcontrollers?

For interfacing these sensors to microcontrollers we require to convert the analog output of these sensors to digital so that the controller can read it. Some microcontrollers have built-in Analog to Digital Convertor (ADC) so there is no need for external ADC. For microcontrollers that don’t have internal ADC external ADC is used.

What is the difference between ADC0804 and adc0808?

One of the most commonly used ADC is ADC0808. ADC 0808 is a Successive approximation type with 8 channels i.e. it can directly access 8 single-ended analog signals. The difference between ADC0804 and ADC0808 is the number of analog input signals.