Analog switch expands I2C interface


Posted on Jun 5, 2012

The dual-channel PCA9540 I2C multiplexer often breaks up an I2C or SM bus or allows you to use devices with the same addresses on the same bus. When the PCA9540 initially powers up, it comes up in a state in which both channels are deselected. The I2C- or SM-bus master can then address the control register in the PCA9540 to select either Channel 0 or Channel 1, connecting the master to the appropriate channel. The I2C bus can then address downstream devices on the selected channel.



If a failure occurs in one of the downstream channels, such that the I2C bus is stuck at high or low, the I2C-bus master could become disabled. Because the PCA9540 has a power-on-reset function that initializes the multiplexer with all channels disconnect




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Cassette Motor Speed Calibrator
20W Power Tube Amplifier with EL34
Connecting an MSP430 to ADS1248 via SPI
digital thermometer with pic16f84
NightRydazz
555 timer Clap switch circuit electronic project
Continuity or just plain connect
Structure and working principle of brushless motor windings
CF8865 module using dedicated switching power supply circuit diagram



Top