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Satellite subsystem

With precision current sources for sensing applications

Renesas announced the ISL70591SEH and ISL70592SEH radiation-hardened precision current sources. They are designed to provide current excitation to the more than 300 resistive sensors that monitor the health of a satellite’s subsystems.

The products come with an operating range of 3 V to 40 V which allows operation off unregulated 28-V power rails (Photo: Renesas Electronics Corporation)

The two Renesas devices are the first current source ICs in its line of space products, and are suited for telemetry, tracking and command, attitude and orbital control, and electrical power subsystem applications. It’s operating temperature ranges from -55 °C to +125 °C.

The ISL70591SEH and ISL70592SEH can be combined for example with the company’s ISL72026SEH 3,3-V CAN transceiver. With these space parts an an analog signal chain that includes power management and communications devices can be formed. The transceiver is compatible with the ISO11898-2 standard for applications calling for CAN serial communication in satellites and aerospace communications and telemetry data processing in harsh industrial environments.

The current sources come in 4-lead ceramic flatpack packages and provide 100 µA and 1 mA of output current, respectively. They replace the discrete solutions that typically require three to five components. The smaller package size places the excitation source closer to the sensor. The company’s current source ICs also reduce system errors by delivering ultra-low noise for higher accuracy over temperature and radiation. Their high output impedance rejects voltage variations on the supply line, and lets designers parallel multiple current sources if they need higher current.

The products deliver performance in the most demanding environments by leveraging Renesas’ proprietary silicon on insulator process. This provides single event latch-up (SEL) and single event burn-out (SEB) robustness in heavy ion environments. Both devices are radiation assurance tested to 100 krad at high dose rate and 75 krad at low dose rate. In addition, the company’s innovative floating design lets users create a current source or sink with no ground connection.

“Our new precision current source devices give satellite customers the high performance, ease of use, and small footprint they need for their designs,” said Philip Chesley, Vice President of Industrial Analog and Power Business Division, Renesas Electronics Corporation. “The ISL70591SEH and ISL70592SEH provide a scalable and highly reliable solution that simplifies the sensor health monitoring of critical spaceflight subsystems.”

These are ready-to-use complete units - with or without housing parts, depending on the intended application.


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