Renesas X9418WS24IZ

Overview

X9418WS24IZ from Intersil is a dual digitally controlled potentiometer (XDCP™) with 2-wire serial interface, 64-tap resolution per pot, ±2.7V to ±5.5V analog supply range, and 24-pin SOIC (300-mil) Pb-free package. It functions as two independent 2.5kΩ or 10kΩ variable resistors for precision analog control in battery-powered instrumentation and industrial signal conditioning.

For engineers reviewing the X9418WS24IZ datasheet, X9418WS24IZ pinout, X9418WS24IZ application, or X9418WS24IZ equivalent, key selection factors include its dual-pot architecture, nonvolatile data register storage (DR0–DR3), hardware write-protect (WP) input, and operation across –40°C to +85°C industrial temperature range.

Technical Context

The X9418WS24IZ implements two independent resistor arrays-each with 63 segments and 64 wiper positions-controlled via a bidirectional 2-wire (I²C-compatible) interface. Each potentiometer features a volatile 6-bit Wiper Counter Register (WCR) and four nonvolatile 6-bit Data Registers (DR0–DR3), enabling persistent storage of up to four wiper settings per channel.

It supports direct wiper position read/write, register-to-register transfer, and real-time increment/decrement via SCL edge-triggered commands. Power-up automatically loads DR0 into the WCR, and hardware write protection (WP pin low) disables nonvolatile writes to preserve calibration data during system operation.

Key Specifications

Pinout & Package

Package: 24-pin SOIC (300-mil), RoHS-compliant Pb-free finish (MDP0044 drawing).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5242BRUZ10 and MCP42010-I/P, the X9418WS24IZ uniquely delivers dual-channel 64-tap control with independent bipolar analog supplies and hardware write protection - making it optimal for industrial calibration and battery-powered bipolar signal paths where bus compatibility and data integrity are critical.

Availability

X9418WS24IZ is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, battery-powered medical monitors, and automotive cabin climate control requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for X9418WS24IZ 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 industrial, communications, and computing markets.

The X9418 product line delivers digitally controlled potentiometers optimized for precision analog trimming, calibration, and signal-path adjustment in harsh environments - emphasizing nonvolatile memory, wide supply tolerance, and robust interface protocols.

FAQ

What is the analog supply configuration required for X9418WS24IZ operation?

The X9418WS24IZ requires three independent supply connections: VCC (2.7V–5.5V digital core), V+ (+2.7V to +5.5V analog high rail), and V− (−5.5V to −2.7V analog low rail). This bipolar analog architecture enables true AC-coupled signal processing and eliminates need for external level-shifting circuitry. The X9418WS24IZ must not be operated with V+ or V− grounded or shorted together.

How does the hardware write-protect (WP) pin function on X9418WS24IZ?

When the WP pin is driven LOW, the X9418WS24IZ blocks all nonvolatile writes to its Data Registers (DR0–DR3), preventing accidental overwrites of factory-calibrated wiper settings. The WP pin has no effect on volatile Wiper Counter Register (WCR) updates or I²C communication. The X9418WS24IZ remains fully functional for read operations and wiper adjustments while WP is active.

Can X9418WS24IZ operate as both a three-terminal potentiometer and a two-terminal variable resistor?

Yes, the X9418WS24IZ supports both configurations per channel: VH/RH and VL/RL serve as fixed end terminals, while VW/RW is the adjustable wiper. As a three-terminal potentiometer, it functions as a voltage divider; as a two-terminal variable resistor, one end terminal is tied to the wiper. The X9418WS24IZ datasheet confirms this flexibility in Applications Information (Page 16).

What is the maximum number of X9418WS24IZ devices that can share a single 2-wire bus?

Up to 16 X9418WS24IZ devices can coexist on one 2-wire bus, enabled by the four hardware-configurable address pins A0–A3. Each device's 8-bit slave address begins with fixed prefix 0101b, followed by the user-defined A3–A0 state. No software address assignment is required - addressing is purely physical and deterministic.

Does X9418WS24IZ support automatic power-up wiper recall, and how is it implemented?

Yes, the X9418WS24IZ automatically loads the contents of Data Register 0 (DR0) into the Wiper Counter Register (WCR) on power-up. This behavior is hardwired and requires no host initialization. To ensure reliable recall, the recommended power sequence is VCC first, then V+ and V−, followed by analog terminal voltages; VCC must ramp cleanly and remain below 0.1V for >1 second before re-powering.