LTC6820

LTC6820 isoSPI Isolated Communications Interface FEATURES DESCRIPTION nn AEC-Q100 Qualified for Automotive Applications nn 1Mbps Isolated SPI Data Communications nn Simple Galvanic Isolation Using Standard Transformers nn Bidirectional Interface Over a Single Twisted Pair nn Supports Cable Lengths Up to 100 Meters nn Very Low EMI Susceptibility and Emissions nn Configurable for High Noise Immunity or Low Power nn Engineered for ISO26262 Compliant Systems nn Requires No Software Changes in Most SPI Systems nn Ultralow, 2µA Idle Current nn Automatic Wake-Up Detection nn Operating Temperature Range: –40°C to 125°C nn 2.7V to 5.5V Power Supply nn Interfaces to All Logic from 1.7V to 5.5V nn Available in 16-Lead QFN and MSOP Packages APPLICATIONS nn Industrial Networking nn Battery Monitoring Systems nn Remote Sensors The LTC®6820 provides bidirectional SPI communications between two isolated devices through a single twistedpair connection. Each LTC6820 encodes logic states into signals that are transmitted across an isolation barrier to another LTC6820. The receiving LTC6820 decodes the transmission and drives the slave bus to the appropriate logic states. The isolation barrier can be bridged by a simple pulse transformer to achieve hundreds of volts of isolation. The LTC6820 drives differential signals using matched source and sink currents, eliminating the requirement for a transformer center tap and reducing EMI. Precision window comparators in the receiver detect the dif...