Renesas X9418WV24

Overview

X9418WV24 from Intersil is a dual digitally controlled potentiometer (XDCP™) with 2-wire serial interface, 64-tap resolution per channel, 10 kΩ end-to-end resistance, ±20% tolerance, and operation from 2.7V to 5.5V VCC with dual analog supplies (±2.7V to ±5.5V). It serves as a programmable voltage divider or variable resistor in precision analog signal conditioning circuits.

For engineers reviewing the X9418WV24 datasheet, X9418WV24 pinout, X9418WV24 application, or X9418WV24 equivalent, key selection criteria include dual-potentiometer integration, nonvolatile wiper position storage (DR0–DR3), hardware write protection (WP), TSSOP-24 package compatibility, and support for battery-powered systems requiring <1 µA standby current.

Technical Context

The X9418WV24 implements two independent 63-segment resistor arrays with CMOS-switched wipers controlled by 6-bit volatile Wiper Counter Registers (WCRs). Each potentiometer features four 6-bit nonvolatile Data Registers (DR0–DR3) for storing wiper positions or system parameters, with automatic DR0→WCR load at power-up.

It uses a standard 2-wire (I²C-compatible) interface with slave address configurable via A0–A3 pins, supports increment/decrement wiper control via SCL/SDA timing, and enforces write protection through the active-low WP pin. Analog section operates from separate V+/V− rails, enabling bipolar signal handling up to ±5.5V.

Key Specifications

Pinout & Package

Package: 24-lead TSSOP (4.4 mm body width), RoHS-compliant Pb-free plus anneal 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 X9418WV24 uniquely combines dual-channel 64-tap control, bipolar analog supply support, nonvolatile register storage, and hardware write protection in a single 24-pin TSSOP package-making it optimal for space-constrained, battery-powered, and calibration-critical analog systems.

Availability

X9418WV24 is available at Aetrix Electronics and suitable for audio signal conditioning, DC-DC feedback tuning, programmable reference generation, and comparator hysteresis adjustment requiring stable component supply across commercial temperature range (0°C to +70°C).

Supply support for X9418WV24 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 X9418 product line delivers digitally controlled potentiometers optimized for replacing mechanical trimmers in calibration-sensitive, low-power, and space-constrained systems-emphasizing nonvolatile storage, dual-channel integration, and robust analog performance.

FAQ

What is the recommended power-up sequence for reliable operation of the X9418WV24?

The X9418WV24 requires strict power sequencing: apply VCC first, then V+ and V−, and finally connect RH/RL/RW pins. Voltage must not be applied to potentiometer terminals before V+ or V− reaches regulation. VCC ramp rate should be 0.2–50 V/msec; glitches must stay below 100 mV. Failure to follow this sequence may prevent DR0→WCR recall at startup, causing incorrect initial wiper positions in the X9418WV24.

Does the X9418WV24 support true bipolar analog operation, and what are the voltage limits?

Yes, the X9418WV24 supports true bipolar analog operation using separate V+ and V− supplies. Per datasheet FN8194 Rev 2.00, V+ ranges from +2.7V to +5.5V and V− from −2.7V to −5.5V, with maximum differential (V+ − V−) of 12V. This allows the VH/VL/VW pins to swing fully between V− and V+, enabling use in AC-coupled amplifiers, offset-nulling circuits, and bipolar sensor interfaces without external level-shifting-critical for accurate analog control in the X9418WV24.

How many nonvolatile data registers does the X9418WV24 provide, and how are they used?

The X9418WV24 provides four 6-bit nonvolatile Data Registers (DR0–DR3) per potentiometer, totaling eight registers. DR0 is automatically loaded into the Wiper Counter Register (WCR) at power-up. All DRs can store wiper positions or general-purpose system parameters (e.g., calibration coefficients, user preferences). Writes to DRs require nonvolatile programming (5–10 ms), and data retention is guaranteed for 100 years-making them ideal for persistent configuration storage in the X9418WV24.

Can the X9418WV24 be used as a two-terminal variable resistor, and what are the design considerations?

Yes, the X9418WV24 can operate as a two-terminal variable resistor by connecting either VH/RH or VL/RL to VW/RW and using the remaining terminal pair. In this mode, resistance varies from near-zero (wiper at terminal) to full array value (10 kΩ). Design considerations include limiting wiper current to ±3 mA, ensuring V+ and V− supply the full voltage range across the selected terminals, and verifying thermal dissipation (50 mW max per pot) under worst-case DC bias-key for stable operation in precision current-source or gain-control applications using the X9418WV24.

What is the function of the WP (Write Protect) pin on the X9418WV24, and how should it be managed?

The WP pin on the X9418WV24 is an active-low hardware write protect that disables all nonvolatile writes to DR0–DR3 when pulled low. It does not affect volatile WCR updates or read operations. For calibration-critical applications, tie WP to VSS after initial programming to prevent accidental overwrites during firmware execution or ESD events. During development, pull WP high (via 10 kΩ resistor to VCC) to enable DR writes. This feature ensures data integrity in deployed systems using the X9418WV24.