Silicon Labs has introduced a family of isolated analog amplifiers, voltage sensors and delta-sigma modulator (DSM) devices designed to provide accurate current and voltage measurement with very low drift across temperature. Based on Silicon Labs’ robust, third-generation isolation technology, the new Si89xx family provides flexible voltage, current, output and package options to help developers reduce BOM cost and shrink board space for a wide range of industrial and green-energy applications including electric vehicle (EV) battery management and charging systems, dc-dc converters, and motor, solar and wind turbine inverters.
Precise current and voltage measurement is essential for the accurate operation of power control systems. To maximize efficiency and respond quickly to faults or changes in load, system controllers require current and voltage information from high-voltage rails. Silicon Labs’ third-generation isolation technology keeps controllers safe across wide temperature variations with 1414 V working voltage and 13 kV bipolar surge, exceeding stringent industry requirements.
Automotive battery and motor/photovoltaic inverter systems require reliable current monitoring with robust noise immunity. The Si89xx devices provide up to 3x higher common-mode transient immunity (CMTI) than competing products. The devices’ 75 kV/µs immunity to fast transients ensures reliable and accurate current readings in demanding industrial applications. The Si89xx family also supports a fail-safe indication to the host controller if the high-side supply voltage is not detected.
The Si89xx devices provide typical offset error as low as ±40 µV and ±0.1% gain error, enabling precise measurements. Typical offset drift as low as ±0.15 µV/˚C and typical gain drift as low as –6 ppm/˚C ensure exceptional accuracy across temperature. The devices offer the industry’s highest typical signal-to-noise ratio (SNR)—up to 90 dB. A unique low-power mode automatically reduces current draw on one side of the isolation barrier to approximately 1 mA whenever voltage is removed from the other side, enabling a controller to manage power with a simple field-effect transistor (FET).
Advanced samples of Si892x/3x/4x devices in wide-body SOIC-8 packages are available now, and advanced samples of the devices in narrow-body SOIC-8 packages are planned to be available in Q2. Production quantities of all Si89xx devices are planned for Q3.
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