• What is the range of Vin if Vref is Internal in an ATmega328? Compute the step size
• What is the range of Vin if Vref is Internal in an ATmega328? Compute the step size
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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![### ADC Exercise 2
#### Questions:
1. **What is the range of \( V_{in} \) if \( V_{ref} \) is internal in an ATmega328?**
2. **Compute the step size**
#### Instructions:
- Review the reference manual or datasheet of the ATmega328 microcontroller to determine the internal reference voltage (\( V_{ref} \)).
- Calculate the input voltage range \( V_{in} \) for the given internal \( V_{ref} \).
- Use the formula for step size computation:
\[
\text{Step Size} = \frac{V_{ref}}{2^n}
\]
where \( n \) is the number of bits in the ADC.
#### Explanation:
1. **Determining the Range \( V_{in} \):**
- The ATmega328 typically has an internal reference voltage (\( V_{ref} \)) which you can find in its datasheet.
- This reference voltage defines the upper limit of the input voltage range. For example, if \( V_{ref} \) is 5V, then \( V_{in} \) can range from 0V to 5V.
2. **Computing the Step Size:**
- Using the formula above and considering the ADC resolution of the ATmega328 (usually 10 bits), you can calculate the step size.
- For example, if \( V_{ref} \) is 5V and the resolution is 10 bits:
\[
\text{Step Size} = \frac{5V}{2^{10}} = \frac{5V}{1024} \approx 4.88 mV
\]
Explore the datasheet and apply the appropriate calculations to derive the solutions for this exercise.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F6ab3919f-a013-44e3-89f4-5cab61d5ea51%2F564a53e4-23e3-4182-b310-bde6e56228b7%2Fr2di6h_processed.jpeg&w=3840&q=75)
Transcribed Image Text:### ADC Exercise 2
#### Questions:
1. **What is the range of \( V_{in} \) if \( V_{ref} \) is internal in an ATmega328?**
2. **Compute the step size**
#### Instructions:
- Review the reference manual or datasheet of the ATmega328 microcontroller to determine the internal reference voltage (\( V_{ref} \)).
- Calculate the input voltage range \( V_{in} \) for the given internal \( V_{ref} \).
- Use the formula for step size computation:
\[
\text{Step Size} = \frac{V_{ref}}{2^n}
\]
where \( n \) is the number of bits in the ADC.
#### Explanation:
1. **Determining the Range \( V_{in} \):**
- The ATmega328 typically has an internal reference voltage (\( V_{ref} \)) which you can find in its datasheet.
- This reference voltage defines the upper limit of the input voltage range. For example, if \( V_{ref} \) is 5V, then \( V_{in} \) can range from 0V to 5V.
2. **Computing the Step Size:**
- Using the formula above and considering the ADC resolution of the ATmega328 (usually 10 bits), you can calculate the step size.
- For example, if \( V_{ref} \) is 5V and the resolution is 10 bits:
\[
\text{Step Size} = \frac{5V}{2^{10}} = \frac{5V}{1024} \approx 4.88 mV
\]
Explore the datasheet and apply the appropriate calculations to derive the solutions for this exercise.
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