| 1414V insulation voltage, 13kV bipolar surge withstand
| Current and voltage sensor family, optimized into four categories
| Demonstrates 75kV/µs resistance to rapid transients Silicon Labs today announced the launch of a family of isolated analog amplifiers, voltage sensors and delta-sigma modulator (DSM) devices designed to enable accurate current and voltage measurements with low drift across ambient temperature changes.
Silicon Labs Si89xx family of products Based on Silicon Labs’ third-generation isolation technology, the Si89xx family offers a variety of voltage, current, output and package options, enabling developers to reduce BOM cost and board space by selecting the right option for their design in a wide range of industrial and renewable energy applications, including electric vehicle (EV) battery management and charging systems, DC/DC converters, motors, and solar and wind turbine inverters.
Accurate current and voltage measurements are essential for the accurate operation of power control systems. To maximize efficiency and respond quickly to faults or load changes, system controllers must be able to obtain accurate information about current and voltage from high-voltage rails. Silicon Labs' third-generation isolation technology exceeds stringent industrial requirements, providing 1414 V of isolation working voltage and 13 kV of bipolar surge capability while keeping controllers safe across wide temperature variations.
Silicon Labs offers a broad portfolio of current and voltage sensor products. The Si89xx family includes four product categories: ▲Si892x: Isolated analog amplifiers optimized for shunt-current sensing ▲Si8931/2: Isolated analog amplifiers optimized for general-purpose voltage sensing ▲Si8935/6/7: Isolated DSM devices optimized for voltage sensing ▲Si8941/6/7: Isolated DSM devices optimized for shunt-current sensing
Automotive battery and motor/photovoltaic inverter systems require robust noise immunity along with reliable current monitoring. The Si89xx devices provide up to 3x higher common-mode transient immunity (CMTI) than competing devices. The devices exhibit 75 kV/µs of fast transient immunity, ensuring reliable and accurate current readings in demanding industrial applications. The Si89xx family also supports fail-safe notification to the host controller if the high-side supply voltage is not detected.
The Si89xx devices provide typical offset and gain errors as low as ±40 µV and ±0.1%, respectively, enabling accurate measurements. Typical offset drift is as low as ±0.15 µV/˚C and typical gain drift is as low as –6 ppm/˚C, ensuring high accuracy across the operating temperature range. Typical signal-to-noise ratio (SNR) is up to 90 dB. A low power mode allows the controller to manage power with a simple FET by automatically reducing the current draw on one side of the barrier to about 1mA whenever voltage is removed from the other side.
“Our first- and second-generation mixed-signal isolation technologies have driven the success of Silicon Labs’ digital isolation products for more than a decade,” said Brian Mirkin, vice president and general manager of Silicon Labs’ power products. “Our third-generation technology, used in our Si89xx devices, surpasses previous generations.”
“Silicon Labs’ isolation products will continue to replace legacy optocoupler technology and outperform competing digital isolation products,” he continued. “They will deliver higher surge performance, reliability, integration, and best-in-class safety for system designs that require protection against high voltages.”
