Renesas ISL95311WIU10Z

Overview

ISL95311WIU10Z from Renesas (formerly Intersil) is a digitally controlled potentiometer (XDCP™) with I²C interface, 10kΩ total resistance, 128-tap resolution, and nonvolatile wiper position storage. It operates as a three-terminal potentiometer or two-terminal variable resistor, supporting terminal voltages from 0V to +13.2V. It is used in LCD contrast control, bias adjustment circuits, and mechanical potentiometer replacement in industrial and automotive systems.

For engineers reviewing the ISL95311WIU10Z datasheet, ISL95311WIU10Z pinout, ISL95311WIU10Z application, or ISL95311WIU10Z equivalent, key selection criteria include I²C address configurability (A0/A1), 70Ω typical wiper resistance at 3.3V, ±3.0mA max wiper current, -40°C to +85°C operating range, and 10-lead MSOP package compatibility with Pb-free reflow profiles.

Technical Context

The ISL95311WIU10Z implements a 127-element resistor array with CMOS "make-before-break" wiper switching, controlled by a 7-bit volatile Wiper Register (WR) and initialized from a nonvolatile Initial Value Register (IVR). Its I²C interface supports 400kHz clock rate, slave address selection via A0/A1 pins, and dual-register access (WR/IVR) via an Access Control Register at address 02h.

Power sequencing requires VCC applied before or simultaneously with V+, with V+ ramping between 8.0V–13.2V and VCC between 2.7V–5.5V. The device recalls IVR contents to WR on power-up after VCC exceeds 1.5V, with 3ms delay to full initialization. Wiper response time is 1µs from SCL falling edge to physical tap change.

Key Specifications

Pinout & Package

ISL95311WIU10Z is housed in a 10-lead MSOP package (Pb-free, RoHS compliant, pkg drawing M10.118), with exposed pad not electrically connected. Pin functions are validated per FN8084 Rev 2.00 datasheet.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5171BRMZ10 and MCP45HV51-103E/MS, ISL95311WIU10Z uniquely combines 128-tap resolution, 0–13.2V terminal voltage, automatic IVR-to-WR recall, and I²C address flexibility-making it optimal for industrial and automotive designs requiring robust, self-initializing analog tuning.

Availability

ISL95311WIU10Z is available at Aetrix Electronics and suitable for LCD contrast control, power supply bias adjustment, and industrial sensor calibration requiring stable component supply and long-term obsolescence management.

Supply support for ISL95311WIU10Z 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 Corporation is a global leader in microcontrollers, analog, power management, and SoC solutions, formed through the acquisition of Intersil in 2017.

The ISL95311WIU10Z belongs to Renesas' precision analog XDCP™ (eXternally Digitally Controlled Potentiometer) product line, designed specifically for replacing mechanical potentiometers in industrial, automotive, and consumer systems requiring programmable, nonvolatile resistance tuning.

FAQ

What is the maximum allowable voltage on the RH, RW, and RL pins of the ISL95311WIU10Z?

The ISL95311WIU10Z supports a terminal voltage range of 0V to +13.2V on RH, RW, and RL pins relative to GND. This rating applies when V+ is set between 8.0V and 13.2V and is independent of VCC. Exceeding +13.2V violates absolute maximum ratings and may cause permanent damage to the internal resistor array or switches.

How does the ISL95311WIU10Z handle power-up initialization, and what role does the IVR play?

On power-up, the ISL95311WIU10Z first resets the volatile Wiper Register (WR) to 20h (64 decimal), then loads the value stored in the nonvolatile Initial Value Register (IVR) into WR once VCC exceeds the power-on recall threshold (1.5–2.6V). The IVR is pre-programmed to 40h and can be rewritten via I²C to define the default wiper position after every power cycle.

Can the ISL95311WIU10Z operate with VCC and V+ supplied from different sources, and what sequencing is required?

Yes, VCC (2.7–5.5V) and V+ (8.0–13.2V) may come from independent supplies, but VCC must be applied before or simultaneously with V+. Applying V+ before VCC risks turning on multiple CMOS switches prematurely, causing undefined wiper states or excessive supply loading. During power-down, V+ should turn off before or with VCC to avoid undefined wiper behavior.

What is the function of the A0 and A1 pins on the ISL95311WIU10Z, and how do they affect I²C communication?

A0 and A1 are I²C slave address select pins that configure bits 1 and 0 of the 7-bit slave address (01010xx format). They allow up to four ISL95311WIU10Z devices to share the same I²C bus without address conflict. Pulling A0 and A1 to GND, VCC, or combinations sets unique addresses (e.g., 0x54, 0x55, 0x56, 0x57), enabling individual addressing in multi-device systems.

Does the ISL95311WIU10Z support both voltage divider and variable resistor configurations, and how is the mode selected?

Yes, the ISL95311WIU10Z supports both configurations without hardware modification. In voltage divider mode, RH and RL are connected to V+ and GND respectively, with RW as the output. In variable resistor (rheostat) mode, either RH or RL is left unconnected while RW and the other fixed terminal form the two-terminal element. Mode selection is purely external-no register programming is required.