Q:
What are the limitations of I2C interface?
belongs to collection: Embedded C interview questions and answers (2022)
Embedded C interview questions and answers (2022)
- What is the difference between C and embedded C?
- What is the volatile keyword?
- What is the use of volatile keyword?
- What is the difference between the const and volatile qualifiers in C?
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- What is the difference between const and macro?
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- What are the limitations of I2C interface?
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C programming
Answer:
- Half-duplex communication, so data is transmitted only in one direction (because of the single data bus) at a time.
- Since the bus is shared by many devices, debugging an I2C bus (detecting which device is misbehaving) for issues is pretty difficult.
- The I2C bus is shared by multiple slave devices if anyone of these slaves misbehaves (pull either SCL or SDA low for an indefinite time) the bus will be stalled. No further communication will take place.
- I2C uses resistive pull-up for its bus. Limiting the bus speed.
- Bus speed is directly dependent on the bus capacitance, meaning longer I2C bus traces will limit the bus speed.
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