Datasheet LTM2887 (Analog Devices)

LTM2887 SPI/Digital or I2C µModule Isolator with Dual Adjustable 5V Regulators
FEATURES DESCRIPTION
n
6-Channel Logic Isolator: 2500VRMS for 1 Minute
The LTM®2887 is a complete galvanic digital µModule® n
UL-CSA Recognized File #E151738
(micromodule) isolator. No external components are n
Isolated DC Power:
required. A single 3.3V or 5V supply powers both sides n
1.8V to 5V Logic Supply at Up to 100mA
of the interface through an integrated, isolated DC/DC n
0.6V to 5V Auxiliary Supply at Up to 100mA
converter. A logic supply pin allows easy interfacing with n
No External Components Required
different logic levels from 1.62V to 5.5V, independent of n
SPI/Digital (LTM2887-S) or I2C (LTM2887-I) Options
the main supply. n
High Common Mode Transient Immunity: 30kV/μs
Available options are compliant with SPI and I2C (master n
High Speed Operation:
mode only) specifications. n
10MHz Digital Isolation
n
4MHz/8MHz SPI Isolation
The isolated side includes two 5V nominal power supplies, n
400kHz I2C Isolation
including programmable current limit, each capable of n 3.3V (LTM2887-3) or 5V (LTM2887-5) Operation providing more than 100mA of load current. The supplies n 1.62V to 5.5V Logic Supply may be adjusted from their nominal value using a single n ±10kV ESD HBM Across the Isolation Barrier external resistor. n Maximum Continuous Working Voltage: 560VPEAK Coupled inductors and an isolation power transformer n Low Current Shutdown Mode (<10µA) provide 2500VRMS of isolation between the input and out- n Low Profile 15mm × 11.25mm × 3.42mm BGA Package put logic interface. This device is ideal for systems where the ground loop is broken, allowing for a large common
APPLICATIONS
mode voltage range. Communication is uninterrupted for n Isolated SPI or I2C Interfaces common mode transients greater than 30kV/μs. n Industrial Systems L, LT, LTC, LTM, Linear Technology, the Linear logo and µModule are registered trademarks of Analog Devices, Inc. All other trademarks are the property of their respective owners. n Test and Measurement Equipment n Breaking Ground Loops
TYPICAL APPLICATION Isolated 4MHz SPI Interface LTM2887 Operating Through 50kV/µs CM Transients
LTM2887-5S VCC2 SCK VCC 5V AT 100mA SD0 5V AVCC2 5V/DIV SCK2 = SD02 V 1.15k L IVCC2 ON VL2 3.3V AT 100mA AVL2 IVL2 27.4k REPETITIVE COMMON MODE 1.15k SDOE TRANSIENTS GND2 TO GND CS CS2 CS CS 6.04k TION BARRIER SDI SDI2 SDI SDI SCK ISOLA SCK2 SCK SCK 200V/DIV DO2 I2 20ns/DIV 2887 TA01b SDO SDO2 SDO SDO DO1 I1 GND GND2 2887 TA01a 2887fb For more information www.linear.com/LTM2887 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Product Selection Guide Order Information Electrical Characteristics Switching Characteristics Isolation Characteristics Typical Performance Characteristics Pin Functions Block Diagrams Test Circuits Applications Information Typical Applications Package Description Revision History Typical Application Related Parts