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STMicroelectronics VNI8200XP smart power solid state relay

The VNI8200XP is a monolithic 8-channel driver featuring a very low supply current, with integrated SPI interface


The VNI8200XP is a monolithic 8-channel driver featuring a very low supply current, with integrated SPI interface and high efficiency 100 mA micropower step-down switching regulator peak current control loop mode.

The IC, realized in STMicroelectronics™ VIPower™ technology, is intended to drive any kind of load with one side connected to ground.

Active channel current limitation combined with thermal shutdown, independent for each channel, and automatic restart, protect the device against overload.

The SPI interface allows command of the output driver by enabling or disabling each channel featuring, in 16-bit format, a parity check control for communication robustness. It also allows the monitoring of the status of the IC signaling Power Good, overtemperature condition for each channel, IC pre-warning temperature detection.

Built-in thermal shutdown protects the chip from overtemperature and short-circuit. In overload condition, the channel turns OFF and ON again automatically after the IC temperature decreases below a threshold fixed by a temperature hysteresis so that junction temperature is controlled. 

The watchdog function is used to detect the occurrence of a software fault of the host controller. The watchdog circuitry generates an internal reset on expiry of the internal watchdog timer. The watchdog timer reset can be achieved by applying a negative pulse on the WD pin. The watchdog function can be disabled by the WD_EN dedicated pin. This pin also allows the programming of a wide range of watchdog timings.

An internal LED matrix driver circuitry (4 rows, 2 columns) allows the detection of the status of the single outputs. An integrated step-down voltage regulator provides supply voltage to the internal LED matrix driver and logic output buffers and can be used to supply the external optocouplers if the application requires isolation. The regulator is protected against short-circuit or overload conditions by means of pulse-by-pulse current limit with a peak current control loop.


Key features


Additional features

  • Output current: 0.7 A per channel
  • Serial/parallel selectable interface
  • Short-circuit protection
  • 8-bit and 16-bit SPI Interface for IC command and control diagnostic
  • Channel overtemperature detection and protection
  • Thermal independence of separate channels
  • Drives all type of loads (resistive, capacitive, inductive load)
  • Loss of GND protection
  • Power Good diagnostic
  • Undervoltage shutdown with hysteresis
  • Overvoltage protection (VCC clamping)

.. And many more; please check ST's datasheet



  • Programmable logic control
  • Industrial PC peripheral input/output
  • Numerical control machines



The STEVAL-IFP022V1 demonstration board is based on VNI8200XP high-side driver. It was developed as an instrument to test device functionality in terms of power management and digital interface.

As required by industrial standards, the board’s isolated interface between the IPS and host controller were implemented using high-speed opto-couplers for IPS driving, and low-speed opto-couplers to receive device status information. The connection is achieved through a 30-pin connector.

To provide a user-friendly way to test VNI8200XP device functionality, a GUI interface was developed. To use the GUI it is necessary to connect the STEVAL-IFP022V1 demonstration board to a PC by using a communication board (STEVAL-PCC009V2).

Thermal performance is improved thanks to a four-layer structure which makes it possible to design a copper area distributed in all the layers for more effective heat dissipation.

The STEVAL-IFP022V1 demonstration board meets EFT standard requirements IEC 61000-4-2, IEC 61000-4-4, IEC 61000-4-5.

STMicroelectronics VNI8200XP solid state relay | EBV Elektronik

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