Renesas ISL95810UIRT8

Overview

ISL95810UIRT8 from Intersil is a single-channel, digitally controlled potentiometer (XDCP™) with I²C interface, 256-tap resolution (0.4% step), 50 kΩ end-to-end resistance, and 70 Ω typical wiper resistance at 3.3 V. It operates from 2.7 V to 5.5 V and supports voltage divider or rheostat configurations in precision analog control loops.

For engineers reviewing the ISL95810UIRT8 datasheet, ISL95810UIRT8 pinout, ISL95810UIRT8 application, or ISL95810UIRT8 equivalent, this device delivers non-volatile wiper position storage, ±0.5 LSB DNL in voltage divider mode, 5 µA max standby current, and RoHS-compliant 3×3 mm TDFN-8 packaging for space-constrained industrial and embedded systems.

Technical Context

The ISL95810UIRT8 integrates a monolithic CMOS digitally controlled potentiometer with volatile Wiper Register (WR) and non-volatile Initial Value Register (IVR), enabling power-up recall of user-defined wiper position. Its I²C interface supports 400 kHz operation with hardware write protection via WP pin.

Implemented using resistor ladders and CMOS switches, the device provides monotonic wiper movement across all 256 taps, with ratiometric temperature coefficient of ±4 ppm/°C and resistance TC of ±45 ppm/°C. It supports both three-terminal potentiometer and two-terminal variable resistor topologies.

Key Specifications

Pinout & Package

ISL95810UIRT8 uses an 8-lead 3×3 mm Thin Dual Flat No-Lead (TDFN) package with exposed thermal pad. Pin numbering follows JEDEC-standard top-view orientation with pin 1 marked by dot or notch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digitally controlled potentiometer applications.

Compared with AD5175BCPZ-10-R7 and MCP45HV51-503E/MS, the ISL95810UIRT8 offers optimal balance of low wiper resistance, I²C compatibility, and industrial-grade temperature stability in compact TDFN packaging-making it preferred for precision 3.3 V/5 V embedded control where board space and interface simplicity are critical.

Availability

ISL95810UIRT8 is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded power management, and precision analog signal conditioning requiring stable component supply and long-term lifecycle support.

Supply support for ISL95810UIRT8 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Intersil Corporation (now part of Renesas Electronics) designs high-performance analog and mixed-signal ICs for power management, precision analog, and interface applications.

The ISL95810UIRT8 belongs to Intersil's XDCP™ family of digitally controlled potentiometers, engineered specifically for replacing mechanical trimmers in automated calibration, programmable gain control, and adaptive biasing systems.

FAQ

What is the default wiper position after power-up for the ISL95810UIRT8?

At power-up, the ISL95810UIRT8 loads the value stored in its non-volatile Initial Value Register (IVR) into the volatile Wiper Register (WR). The device ships pre-programmed with 0x80 (128 decimal) in the IVR, placing the wiper at mid-scale-approximately 25 kΩ between RH and RW, and 25 kΩ between RW and RL-unless previously reprogrammed by the user.

Can the ISL95810UIRT8 operate as a two-terminal variable resistor?

Yes, the ISL95810UIRT8 can be used as a two-terminal rheostat by connecting either RH or RL to RW externally and leaving the unused terminal open. In this configuration, resistance is adjusted between RW and the connected fixed terminal, supporting applications like LED current limiting or oscillator frequency tuning where only one adjustable endpoint is required.

Does the ISL95810UIRT8 require external pull-up resistors on SDA and SCL lines?

Yes, the ISL95810UIRT8 requires external pull-up resistors on both SDA and SCL lines to ensure proper I²C bus operation. Recommended values range from ~2 kΩ (for 400 pF bus capacitance) to ~20 kΩ (for 40 pF), per datasheet guidance. Pull-ups must connect to the same VCC rail used by the ISL95810UIRT8 to maintain valid logic levels.

How does the WP pin affect non-volatile writes on the ISL95810UIRT8?

The WP pin must be held HIGH to enable any write operation-including non-volatile writes to the IVR. When WP is LOW, the ISL95810UIRT8 ignores incoming write commands, does not acknowledge data bytes, and remains in standby. This hardware lock prevents accidental corruption of factory-trimmed or field-calibrated settings during normal system operation.

What is the maximum allowable voltage across the DCP terminals of the ISL95810UIRT8?

The absolute maximum voltage across any DCP terminal (RH, RW, RL) relative to GND is limited to VCC, per the datasheet. Additionally, the power rating per DCP element is 5 mW. For the 50 kΩ ISL95810UIRT8, this implies a maximum voltage differential of √(5 mW × 50 kΩ) ≈ 15.8 V-but operation above VCC violates the absolute max rating and risks permanent damage. Always keep RH–RL ≤ VCC.