ACtE08 · Chapter 8Demo2 · Set 1🏛️ Past Licensure QuestionID: 208a3a28
The Inter-Integrated Circuit () serial communication bus requires how many active signal wires?
The Inter-Integrated Circuit () serial communication bus requires how many active signal wires?
Multiple Choice Options
- A
1
- B✓ Correct Option
2
- C
3
- D
4
Detailed Technical Solution & Explanation
(Inter-Integrated Circuit), developed by Philips (NXP), is a synchronous, multi-master, multi-slave, packet-switched serial communication bus that requires exactly 2 signal lines (both pulled up to via open-drain/open-collector resistors):
1. SDA (Serial Data Line): Bidirectional line for data packet transmission.
2. SCL (Serial Clock Line): Clock line generated by the bus master to synchronize bit sampling.
Option Analysis:
•
Option A (1): Incorrect; 1-Wire protocol (Dallas/Maxim) uses a single signal line.
•
Option B (2): Correct; utilizes exactly 2 active signal wires: SDA and SCL.
•
Option C (3): Incorrect; UART uses 2 or 3 lines (TX, RX, optional GND).
•
Option D (4): Incorrect; SPI (Serial Peripheral Interface) typically uses 4 wires (MOSI, MISO, SCK, CS).
Reference: Demo2 · Set 1NEC Licensure Syllabus