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LTC6820IUD DataSheet

LTC6820IUD DataSheet

Part No.
Part Marking
–40°C to 85°C
16-Lead (3mm × 3mm) Plastic QFN
File Size
2467 KB
30 Pages
Linear Technology
Upload Time
2022-06-06 11:07:54
Update Time
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LTC6820IUD Features

■ AEC-Q100 Qualified for Automotive Applications
■ 1Mbps Isolated SPI Data Communications
■ Simple Galvanic Isolation Using Standard Transformers
■ Bidirectional Interface Over a Single Twisted Pair
■ Supports Cable Lengths Up to 100 Meters
■ Very Low EMI Susceptibility and Emissions
■ Configurable for High Noise Immunity or Low Power
■ Engineered for ISO26262 Compliant Systems
■ Requires No Software Changes in Most SPI Systems
■ Ultralow, 2µA Idle Current
■ Automatic Wake-Up Detection
■ Operating Temperature Range: –40°C to 125°C
■ 2.7V to 5.5V Power Supply
■ Interfaces to All Logic from 1.7V to 5.5V
■ Available in 16-Lead QFN and MSOP Packages

LTC6820IUD Applications

■ Industrial Networking
■ Battery Monitoring Systems
■ Remote Sensors

LTC6820IUD Description

The LTC6820IUD 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 LTC6820IUD 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 differential signals. The drive currents and the comparator thresholds are set by a simple external resistor divider, allowing the system to be optimized for required cable lengths and desired signal-to-noise performance.

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