Renesas X9418WS24

Overview

X9418WS24 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 10kΩ end-to-end resistance. It integrates two independent resistor arrays with volatile wiper counter registers and four nonvolatile data registers per channel, enabling precise digital adjustment in battery-powered instrumentation and precision analog signal conditioning.

For engineers reviewing the X9418WS24 datasheet, X9418WS24 pinout, X9418WS24 application, or X9418WS24 equivalent, this page delivers verified specifications, SOIC-24 package mapping, confirmed I²C-compatible timing (400kHz), power-up wiper recall behavior, and real-world use cases in voltage regulation, amplifier gain control, and offset trimming-without inference or generic claims.

Technical Context

The X9418WS24 implements two independent 63-segment resistor arrays with CMOS switch-based wiper selection controlled by 6-bit volatile Wiper Counter Registers (WCR). Each potentiometer supports direct WCR write, transfer from four nonvolatile Data Registers (DR0–DR3), and real-time increment/decrement via SCL-triggered edge detection on SDA.

It operates with split analog supplies (V+ = +2.7V to +5.5V, V− = −2.7V to −5.5V), enabling true bipolar signal handling, while VCC powers the digital interface (2.7V to 5.5V). Hardware write protection (WP pin) disables nonvolatile register writes, and power-up automatically loads DR0 into both WCRs.

Key Specifications

Pinout & Package

Package: 24-pin SOIC (300-mil), RoHS-compliant Pb-free finish (M24.3 drawing).

Key Features

Applications

Equivalent & Alternatives

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

Compared with X9418WS24, AD5242BRUZ10 offers finer resolution but lacks split-supply capability essential for bipolar signal conditioning, while MCP42010-I/P provides dual-channel operation with higher resolution but requires SPI redesign and cannot replicate the X9418WS24's guaranteed wiper recall from nonvolatile memory on power-up.

Availability

X9418WS24 is available at Aetrix Electronics and suitable for industrial instrumentation, programmable power supplies, and audio equipment requiring stable component supply, long-term calibration retention, and RoHS-compliant packaging.

Supply support for X9418WS24 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 precision, power management, and interface applications.

The X9418 product line delivers digitally controlled potentiometers optimized for replacing mechanical trimmers in systems demanding nonvolatile calibration storage, low power, and bipolar analog signal handling-targeting test equipment, medical devices, and industrial controls.

FAQ

What is the absolute maximum voltage rating for the analog terminals (VH, VL, VW) of the X9418WS24?

The X9418WS24 specifies that voltage on any VH/RH, VL/RL, or VW/RW pin must remain within the range V− to V+. For the X9418WS24 variant, V− = −5.5V and V+ = +5.5V, so these terminals tolerate −5.5V to +5.5V. Exceeding this range risks permanent damage, per Absolute Maximum Ratings on page 11 of FN8194 Rev 2.00. This applies directly to X9418WS24 under all operating conditions.

Does the X9418WS24 support true I²C bus arbitration or multi-master operation?

No, the X9418WS24 does not support I²C bus arbitration or multi-master operation. As stated in the "Principles of Operation" section (page 3), it functions strictly as a slave device: the master initiates all transfers and supplies the clock. The X9418WS24 lacks arbitration logic and will not release SDA during collisions. Its I²C implementation complies with basic slave timing but omits arbitration features required for multi-master systems.

How does power-up sequencing affect wiper position recall in the X9418WS24?

Correct wiper recall in X9418WS24 requires strict power-up sequencing: VCC must be applied first, followed by V+ and V−, then analog pins (VH/VL/VW). If V+ or V− ramp after analog signals are present, or if VCC drops below 0.1V for less than 1 second before re-powering, DR0-to-WCR loading may fail. This behavior is documented in the "Power-Up Timing" section (page 12) and is specific to X9418WS24's internal reset architecture.

Can the X9418WS24 operate with only a unipolar analog supply (e.g., V+ = 5V, V− = 0V)?

Yes, the X9418WS24 can operate with unipolar analog supplies. Per the "Recommended Operating Conditions" table (page 11), V− may be tied to 0V (GND) as long as V+ remains within +2.7V to +5.5V and the voltage difference (V+ − V−) ≤ 12V. In this configuration, the wiper swing is limited to 0V–V+, and the device functions as a standard unipolar digital potentiometer-verified for X9418WS24 in industrial temperature range (−40°C to +85°C).

What is the wiper resistance specification for the X9418WS24, and how does it vary with supply voltage?

The X9418WS24 has a wiper resistance of 150Ω to 250Ω at ±3V analog supplies, and 40Ω to 100Ω at ±5V supplies (page 11, ANALOG CHARACTERISTICS). This variation occurs because on-resistance of the CMOS switches decreases with higher V+–V− differential. These values are measured at ±1mA wiper current and apply specifically to X9418WS24 in its SOIC-24 package under specified test conditions.