Renesas ISL90840WIV2027Z

Overview

ISL90840WIV2027Z from Intersil is a quad digitally controlled potentiometer (XDCP™) IC with I²C interface, 10kΩ total resistance, 256-tap resolution (0.4% step), and 20-lead TSSOP package. It operates from 2.7V to 5.5V, features 70Ω typical wiper resistance at 3.3V, and powers up to mid-scale (128). It serves as precision voltage divider or rheostat in analog trimming, sensor calibration, and programmable gain control.

For engineers reviewing the ISL90840WIV2027Z datasheet, ISL90840WIV2027Z pinout, ISL90840WIV2027Z application, or ISL90840WIV2027Z equivalent, key selection criteria include its quad-channel integration, volatile wiper register architecture, ±2 LSB integral nonlinearity in voltage divider mode, I²C addressability via A0–A2 pins, and -40°C to +85°C industrial temperature range.

Technical Context

The ISL90840WIV2027Z implements four independent digital potentiometers using resistor ladders and CMOS switches, each controlled by an 8-bit volatile Wiper Register (WR) accessible via standard I²C protocol. Its I²C interface supports up to eight devices per bus using three hardware address pins (A0–A2) and complies with 400kHz clock frequency.

Each DCP functions in voltage divider mode (RH–RL–RW) or rheostat mode (RW–RL or RW–RH), with monotonic response, ±4 ppm/°C ratiometric temperature coefficient, and <5 µA standby current at 3.6V. Power-on reset initializes all WRs to 0x80 (128), ensuring repeatable mid-scale startup behavior across channels.

Key Specifications

Pinout & Package

ISL90840WIV2027Z is housed in a 20-lead Thin Shrink Small Outline Package (TSSOP), Pb-free and RoHS-compliant (MDP0044 drawing), with 0.65 mm lead pitch and exposed thermal pad not connected internally.

Key Features

Applications

Equivalent & Alternatives

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

Compared with X95840 and AD5242BRUZ10, ISL90840WIV2027Z uniquely delivers quad-channel integration with guaranteed mid-scale power-on state, tighter DCP matching (±2 LSB), and lower wiper resistance (70Ω) - making it optimal for multi-loop calibration and matched analog signal conditioning.

Availability

ISL90840WIV2027Z is available at Aetrix Electronics and suitable for industrial motor control, medical instrumentation, LED lighting systems, and audio equipment requiring stable component supply and long-term design continuity.

Supply support for ISL90840WIV2027Z 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 ISL90840WIV2027Z belongs to Intersil's XDCP™ family of digitally controlled potentiometers, engineered specifically for replacing mechanical trimpots in automated calibration, sensor signal conditioning, and programmable analog front-ends.

FAQ

What is the power-on behavior of the ISL90840WIV2027Z?

The ISL90840WIV2027Z initializes all four wiper registers to 0x80 (128 decimal) at power-up, placing each wiper at mid-scale between RH and RL terminals. This behavior is hardwired and occurs regardless of prior I²C writes, ensuring predictable startup for safety-critical or self-test applications. No external reset or initialization sequence is required to achieve this state.

Does the ISL90840WIV2027Z support nonvolatile storage of wiper settings?

No, the ISL90840WIV2027Z uses volatile wiper registers only. Wiper positions are lost upon power removal and revert to mid-scale (128) at next power-on. For nonvolatile retention, consider the X95840, which integrates EEPROM to store wiper values across power cycles while maintaining functional compatibility in many designs.

What is the maximum allowable voltage across any DCP terminal of the ISL90840WIV2027Z?

The absolute maximum voltage across any DCP terminal (RH, RL, or RW) relative to GND is 0V to VCC, per the Absolute Maximum Ratings table. Exceeding this range - for example, applying a negative signal to RL or a voltage >VCC to RH - risks latch-up or permanent damage. The device does not support bipolar or rail-to-rail analog signal swing beyond its supply rails.

How many ISL90840WIV2027Z devices can share one I²C bus?

Up to eight ISL90840WIV2027Z devices can operate on a single I²C bus using the three hardware address pins A0, A1, and A2. Each combination of logic levels on these pins sets a unique 3-bit slave address (000–111), allowing individual addressing without software configuration. All devices respond to the same I²C clock and data lines.

Is the ISL90840WIV2027Z pin-compatible with other members of the ISL90840 family?

Yes, all ISL90840 variants - including ISL90840UIV2027Z (50kΩ), ISL90840WAV2027Z (+105°C), and ISL90840WIV2027Z - share identical 20-lead TSSOP pinout and footprint (MDP0044). Only resistance value and temperature grade differ; no PCB layout change is needed when substituting within the same package option.