ISL90810UAU8Z

Digital Potentiometers Overview

The ISL90810UAU8Z is a single digitally controlled potentiometer (XDCP) from Renesas Electronics Corporation, housed in an 8-lead MSOP package. It features 256 resistor taps providing 0.4% resolution with a total resistance of 50kΩ. The device operates on a 2.7V to 5.5V supply and utilizes an I²C serial interface for direct wiper control via an 8-bit volatile register. Key electrical characteristics include a typical wiper resistance of 70Ω at 3.3V, a standby current of 5µA maximum, and a power-on preset to the mid-scale position (tap 128).

Digital Potentiometers Feature Summary

• 256-tap resolution with 50kΩ total resistance.
• I²C serial interface supporting read/write operations.
• Power-on reset to mid-scale (128 tap position).
• Low standby current of 5µA maximum.

Digital Potentiometers Applications

• Control systems requiring digital parameter adjustment.
• Signal processing circuits needing variable gain or attenuation.
• Voltage divider applications for reference level setting.

Digital Potentiometers Procurement Notes

Verify that the part number suffix 'UAU8Z' corresponds to the 50kΩ resistance variant with an industrial temperature range of -40°C to +105°C. Confirm the package type is 8-lead MSOP. Note that the datasheet indicates the 'WIU8Z' and 'WAU8Z' variants are no longer available and recommends the '-TK' tape and reel suffix for ordering.

Digital Potentiometers Selection Notes

Select this component when a 50kΩ digitally adjustable resistance is required within the -40°C to +105°C automotive temperature range. Ensure the application supports I²C communication protocols. Compare against the 10kΩ version (ISL90810WAU8Z) if lower resistance values are needed for the same package and interface requirements.

Digital Potentiometers Part Context

This component belongs to the ISL90810 series of XDCPs manufactured by Intersil, now part of Renesas Electronics. The specific model ISL90810UAU8Z denotes the 50kΩ resistance option in the automotive grade (-40°C to +105°C) temperature range. It shares the same pinout and interface as the 10kΩ variant but differs in total resistance value.

Digital Potentiometers Replacement Considerations

The datasheet explicitly lists ISL90810UAU8Z-TK as the recommended replacement for discontinued variants like ISL90810WAU8Z. Verify compatibility with existing I²C addresses and voltage levels before substitution.

Digital Potentiometers FAQ

What is the default wiper position upon power-up?

Upon power-up, the wiper commences at the mid-scale position, which corresponds to tap 128 (Wiper Register value 80h).

How is the wiper position controlled?

The wiper position is controlled by writing directly to the 8-bit Wiper Register (WR) via the I²C serial interface. The address byte must be set to 00h.

What is the maximum standby current?

The maximum standby current is 5µA when VCC is 3.6V and the I²C interface is in the standby state across the -40°C to +105°C temperature range.