1 wire vs 2 wire | difference between 1 wire and 2 wire interface protocols
This page compares 1 wire protocol vs 2 wire protocol (I2C) and mentions difference between 1 wire interface protocol and 2 wire interface protocol (I2C).
Following table summarizes difference between 1 wire protocol and 2 wire protocol.
| Specifications | 1 wire interface protocol | 2 wire interface protocol (I2C) |
|---|---|---|
| Number of lines | Uses single data line and no clock, requires at least two wires (data and GND) | Uses clock line and data line, requires four wires (MISO, MOSI, SCLK, SS) |
| Clock signal | Not required, as each of the slave devices are clocked using internal oscillator. The oscillator is synchronized to falling edge of the master. | Requires separate SCL line. It is low at START of communication and high at the END of communication. It is referred as START condition and STOP condition. |
| Type of communication | Half duplex | Full duplex |
| Hardware complexity | Less | More |
| Software complexity | More | Less |
| Cost | Cheaper i.e. economical | costlier |
| Supply | parasitic supply i.e. draws power from the data line | external supply is needed for its operation |
| Supply voltage range | Usually from 2.8V (min.) to 5.25V (max.) | +5 or +3.3V or lower |
| Device addressing | 64 bit | uses 7 bit or 8 bit or 9 bit device addressing |
| Modes | strictly master-slave, multiple slaves are supported in multi-drop mode. | multi master is supported |
| Data rate or speed | 16.3 Kbps (standard mode) 163 (overdrive mode) slower |
about 400 Kbps much faster |
| voltage for logic 0 and logic 1 | • Uses CMOS/TTL levels, Hence logic 0 is represented by 0.8V(max.) and
logic 1 is represented by 2.2V (min.) It is often represented by variation in pulse width i.e. logic 0 by wider and logic 1 by narrower width. Hence it is similar to PWM. |
The voltage levels are not fixed due to use of various technology based devices viz. NMOS, CMOS and Bipolar. VIL is usually represented by 0.3*VDD and VIH is represented by 0.7*VDD. |
| Power consumption | Lower | Higher |
| Distance | longer | shorter |
| References | Refer I2C Interface>>. |
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