Renesas X9418WS24-2.7

Overview

X9418WS24-2.7 from Intersil is a dual digitally controlled potentiometer (XDCP™) with 2-wire I²C-compatible interface, 64-tap resolution per pot, ±2.7V to ±5.5V analog supply range (V+/V−), and 10 kΩ end-to-end resistance. It integrates two independent resistor arrays, each with volatile wiper counter registers and four nonvolatile data registers, enabling precise digital adjustment in battery-powered instrumentation and precision analog signal conditioning.

For engineers reviewing the X9418WS24-2.7 datasheet, X9418WS24-2.7 pinout, X9418WS24-2.7 application, or X9418WS24-2.7 equivalent, key selection criteria include dual-potentiometer integration, 2.7V–5.5V VCC compatibility, industrial temperature range (−40°C to +85°C), SOIC-24 package, and hardware write-protect (WP) functionality for EEPROM register safety.

Technical Context

The X9418WS24-2.7 implements two independent 63-segment resistor arrays with CMOS-switched wipers controlled by 6-bit volatile Wiper Counter Registers (WCR). Each potentiometer supports direct read/write of wiper position and transfer between four nonvolatile Data Registers (DR0–DR3) and its WCR, with automatic DR0→WCR load at power-up.

It uses a standard 2-wire bus protocol with slave address formed by fixed device type identifier (0101b) and user-configurable A0–A3 pins, supporting up to 16 devices on one bus. Hardware write protection via WP pin disables nonvolatile writes to DRs, and internal high-voltage write cycle ensures 100,000 endurance cycles and 100-year data retention.

Key Specifications

Pinout & Package

Package: 24-pin SOIC (300-mil), RoHS-compliant, industrial temperature grade (−40°C to +85°C).

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 X9418WS24-2.7 uniquely delivers dual 64-tap pots with true bipolar analog capability and hardware write protection in a single SOIC-24 package-making it optimal for space-constrained, battery-powered instrumentation requiring robust calibration retention and AC signal handling.

Availability

X9418WS24-2.7 is available at Aetrix Electronics and suitable for instrumentation calibration, programmable gain amplifiers, audio channel balancing, and power supply feedback tuning requiring stable component supply across industrial temperature ranges and long product lifecycles.

Supply support for X9418WS24-2.7 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 (now part of Renesas Electronics) is a semiconductor company specializing in precision analog, power management, and interface ICs for industrial, aerospace, and communications markets.

The X9418 product line delivers digitally controlled potentiometers optimized for high-reliability analog trimming in harsh environments, emphasizing nonvolatile storage, bipolar operation, and I²C simplicity for embedded calibration tasks.

FAQ

What is the maximum analog voltage range supported by the X9418WS24-2.7?

The X9418WS24-2.7 supports analog terminal voltages from V− to V+, with V+ ranging from +2.7 V to +5.5 V and V− from −2.7 V to −5.5 V. This enables bipolar signal operation up to ±5.5 V. The absolute maximum rating for (V+) − (V−) is 12 V. All VH, VL, and VW pins must remain within this rail-to-rail window to avoid damage or parametric shift.

How does the hardware write protect (WP) pin function on the X9418WS24-2.7?

When the WP pin is pulled LOW, the X9418WS24-2.7 blocks all nonvolatile writes to its eight Data Registers (DR0–DR3). This prevents accidental overwrites during firmware execution or I²C bus noise events. Volatile operations-including wiper position updates and register reads-remain fully functional. WP has no effect on power-up DR0→WCR loading.

Can the X9418WS24-2.7 operate with only a single positive supply?

No. The X9418WS24-2.7 requires separate V+, V−, and VCC supplies. V+ and V− must be supplied with opposite polarity (e.g., +3.3 V and −3.3 V) to enable proper wiper switching across the resistor array. Operating with V− = VSS violates the absolute maximum rating and will cause functional failure or permanent damage.

What is the power-up behavior of the X9418WS24-2.7 wiper registers?

On power-up, the X9418WS24-2.7 automatically loads the contents of Data Register 0 (DR0) for each potentiometer into its respective volatile Wiper Counter Register (WCR). This occurs only after VCC, V+, and V− have stabilized. If DR0 contains 0x00, the wiper defaults to the VL/RL terminal; if DR0 = 0x3F, it defaults to VH/RH. DR0 must be pre-programmed during manufacturing or initialization.

Does the X9418WS24-2.7 support simultaneous update of both potentiometers?

Yes. The X9418WS24-2.7 supports global transfer instructions: "Global XFR Data Registers to Wiper Counter Registers" and "Global XFR Wiper Counter Registers to Data Registers." These commands update both potentiometers' WCRs or DRs in a single I²C transaction, ensuring matched gain/offset across dual channels without timing skew.