Renesas ISL95810UIU8Z

Overview

ISL95810UIU8Z from Renesas Electronics is a single-channel, 256-tap digitally controlled potentiometer (XDCP™) with I²C interface, 50kΩ end-to-end resistance, ±0.5 LSB integral non-linearity in voltage divider mode, and non-volatile wiper position storage. It operates from 2.7V to 5.5V and is used for precision analog trimming in power supply feedback loops, sensor calibration circuits, and programmable gain amplifiers.

For engineers reviewing the ISL95810UIU8Z datasheet, ISL95810UIU8Z pinout, ISL95810UIU8Z application, or ISL95810UIU8Z equivalent, key selection criteria include its 50kΩ total resistance, 70Ω typical wiper resistance at 3.3V, 5µA max standby current, I²C-compatible timing compliance up to 400kHz, and MSOP-8 RoHS-compliant packaging.

Technical Context

The ISL95810UIU8Z implements a monolithic CMOS DCP using resistor ladders and CMOS switches, with an 8-bit volatile Wiper Register (WR) controlling wiper position and a non-volatile Initial Value Register (IVR) storing power-up default (factory-set to 0x80). Its architecture supports both 3-terminal potentiometer and 2-terminal rheostat configurations.

Wiper movement is monotonic across all 256 taps; at WR=0x00, RW connects near RL; at WR=0xFF, RW connects near RH. Power-on recall loads IVR into WR within 3ms after VCC exceeds 1.8V, and hardware write protection (WP pin) disables I²C writes when asserted low.

Key Specifications

Pinout & Package

ISL95810UIU8Z is housed in an 8-lead MSOP package (JEDEC MO-187-AA compliant), 3.0mm × 3.0mm body, 0.65mm pitch, exposed pad optional. Pin 1 marked with dot or bevel; lead finish is 100% matte tin (RoHS-compliant).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5175BRMZ-50 and MCP45HV51-503E/MS, ISL95810UIU8Z offers superior low-noise performance (70Ω wiper), integrated hardware write protection, and tighter ratiometric tempco (±4ppm/°C), making it optimal for precision industrial feedback and calibration where robustness and analog fidelity are critical.

Availability

ISL95810UIU8Z is available at Aetrix Electronics and suitable for industrial power management, sensor conditioning, programmable analog front-ends, and audio signal path design requiring stable component supply and guaranteed long-term availability.

Supply support for ISL95810UIU8Z 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

Renesas Electronics is a global semiconductor leader delivering microcontrollers, analog power, and mixed-signal solutions for automotive, industrial, and IoT applications.

The ISL95810UIU8Z belongs to Renesas' XDCP™ digitally controlled potentiometer family, engineered for high-reliability analog trimming in systems where mechanical potentiometers fail due to wear, vibration, or environmental stress.

FAQ

What is the default wiper position of the ISL95810UIU8Z at power-up?

The ISL95810UIU8Z powers up with its wiper set to mid-scale (128 decimal / 0x80) by default, as the factory-programmed value in the non-volatile Initial Value Register (IVR) is automatically loaded into the volatile Wiper Register (WR) within 3ms after VCC exceeds 1.8V. This behavior is guaranteed across all units and requires no host initialization.

Does the ISL95810UIU8Z support both potentiometer and rheostat configurations?

Yes, the ISL95810UIU8Z supports both configurations: as a 3-terminal potentiometer (RH–RW–RL) for voltage division, and as a 2-terminal rheostat (RW–RL or RW–RH) for variable resistance. The datasheet confirms monotonic performance and specified INL/RINL in both modes, with RH and RL serving as fixed endpoints and RW as the controllable tap.

What is the maximum allowable capacitive load on the SDA and SCL lines for reliable I²C communication with the ISL95810UIU8Z?

The ISL95810UIU8Z specifies a maximum total bus capacitance (Cb) of 400pF for SDA and SCL lines. For Cb = 400pF, the recommended off-chip pull-up resistor is ~2–2.5kΩ; for lower capacitance (e.g., 40pF), 15–20kΩ is acceptable. Exceeding 400pF may violate tR/tF timing limits (250ns max) and cause ACK failures or data corruption.

How does hardware write protection (WP pin) function on the ISL95810UIU8Z?

The WP pin on the ISL95810UIU8Z is active-low: when pulled to GND (logic low), all I²C write operations-including volatile and non-volatile register writes-are ignored, no ACK is returned, and the device remains in standby. When WP is high (≥0.7×VCC), normal I²C write functionality resumes. This provides deterministic, pin-level security against unintended configuration changes.

What is the wiper resistance specification for the ISL95810UIU8Z and why does it matter in circuit design?

The ISL95810UIU8Z has a typical wiper resistance of 70Ω at 3.3V (max 200Ω). This series resistance directly adds to signal path impedance-critical in high-gain amplifier feedback or precision sensor bridges where even small resistances introduce gain error or offset. Designers must account for it in transfer function calculations and verify that 70Ω does not degrade bandwidth or noise performance in their specific application.