3.75 V, 7-Channel, SPIsolator Multiple Slave, Digital Isolator for SPI

The ADuM31541 is an SPIsolator™ digital isolator optimized for a serial peripheral interface (SPI) that includes support for up to four subordinate devices. Based on the Analog Devices, Inc., iCoupler® chip scale transformer technology, the low propagation delay and jitter in the CLK, MO/SI, MI/SO, and SS SPI bus signals support SPI clock rates of up to 17 MHz.

The ADuM3154 isolator also provides a subordinate select multiplexing system that allows up to four subordinate devices to be serviced from one isolator. When a target subordinate is selected, the subordinate select signal propagates to the desired output with low propagation delay, allowing tight timing control. The isolated SSx is addressed through a 250 kbps low speed, 2-channel address bus, allowing the target subordinate device to be changed in as little as 2.5 µs.

Applications

* Industrial programmable logic controllers (PLCs)

* Sensor isolation

* Supports up to 17 MHz SPI clock speed

* 4 high speed, low propagation delay, SPI signal isolation channels

* Supports up to 4 subordinate devices

* 20-lead SSOP package with 5.1 mm creepage

* High temperature operation: 125°C

* High common-mode transient immunity: >25 kV/μs