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Six-channel logic/SPI/I2C μModule isolator targets low voltage DSPs

It targets low voltage components, including newer DSPs and microprocessors. The well-regulated, adjustable supply rails (up to 5V) deliver more than 100mA of load current over the isolation barrier, with up to 62% efficiency, says the company. The voltages may be adjusted down to 0.6V for the auxiliary supply, and the isolated logic supply may be as low as 1.8V for SPIs. Each supply provides a precise current limit adjustment pin and the ability to adjust the voltage using external resistors.

In industrial system applications, ground potentials can vary widely, often exceeding the tolerable range, interrupting communications or even destroying components. The LTM2887 breaks ground loops by electrically isolating the logic level interface on each side of an internal isolation barrier. This inductively coupled barrier withstands large ground differential voltages up to 2,500VRMS. 

A low EMI isolated DC/DC converter provides the isolated power to the communications interface and output rails. A separate logic supply pin provides direct interfacing with low voltage microcontrollers down to 1.62V. An ‘on’ pin enables the isolator to be shut down and consume less than 10μA. The isolator also provides uninterrupted communications for common mode transients greater than 30kV/μs and rugged ±10kV ESD (HBM) protection across the isolation barrier.

Two communications interface versions are available. The LTM2887-I is I2C- compliant at up to 400kHz with bidirectional serial data (SDA) plus clock and three additional, isolated CMOS logic signals that operate at up to 10MHz.

The LTM2887-S is SPI-compliant and offers six CMOS digital isolator communication channels. All channels operate at up to 10MHz and include three forward direction signals and three reverse direction signals. When configured for SPI communications, the maximum clock rate is 8MHz for uni-directional communication or 4MHz for round-trip bi-directional operation.

A 3.3 or 5.0V version is available, in a 15 x 11.25mm surface mount BGA package, housed in a RoHS-compliant μModule package. Commercial, industrial and automotive versions support operating temperature ranges from 0 to 70°C, -40 to 85°C and -40 to 105°C respectively. 




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