Renesas X9418WV24IT1

Overview

X9418WV24IT1 from Intersil is a dual digitally controlled potentiometer (XDCP™) with 2-wire I²C-compatible interface, 64-tap resolution per pot, ±5.5V analog supply range (V+/V−), and 10kΩ end-to-end resistance. It integrates two independent resistor arrays, volatile wiper counter registers, and four nonvolatile data registers per channel for battery-powered parameter tuning in precision analog circuits.

For engineers reviewing the X9418WV24IT1 datasheet, X9418WV24IT1 pinout, X9418WV24IT1 application, or X9418WV24IT1 equivalent, key selection criteria include dual-pot integration, 2.7–5.5V VCC operation, hardware write-protect (WP) support, TSSOP-24 package compatibility, and nonvolatile storage of up to four wiper positions per channel.

Technical Context

The X9418WV24IT1 implements two 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 6-bit nonvolatile Data Registers (DR0–DR3) and its WCR, with DR0 auto-loaded at power-up.

It uses a standard 2-wire bus protocol with slave address formed by fixed 0101b type identifier and user-configurable A0–A3 pins, enabling up to 16 devices on one bus. Hardware write protection via WP pin disables nonvolatile writes, and internal EEPROM write cycles require ≤10ms with ACK polling support.

Key Specifications

Pinout & Package

Package: 24-lead TSSOP (4.4mm width), RoHS-compliant, Pb-free plus anneal finish.

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 X9418WV24IT1 uniquely delivers dual 64-tap pots with true ±5.5V analog operation and hardware write protection in a single I²C device-enabling compact, robust calibration in bipolar signal chains where interface simplicity and configuration security are critical.

Availability

X9418WV24IT1 is available at Aetrix Electronics and suitable for audio volume control, programmable gain amplifiers, voltage regulator trim, and comparator hysteresis setting requiring stable component supply and long-term configuration retention.

Supply support for X9418WV24IT1 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 series was developed as a low-power, nonvolatile digitally controlled potentiometer family targeting calibration, trimming, and parameter adjustment in battery-operated and industrial instrumentation systems.

FAQ

What is the maximum analog voltage range supported by the X9418WV24IT1?

The X9418WV24IT1 supports an analog voltage range from V− to V+, rated at −5.5V to +5.5V. This enables true bipolar operation across the potentiometer terminals (VH/RH, VL/RL, VW/RW), making it suitable for AC-coupled signal paths and op-amp offset adjustment where signals swing above and below ground. The X9418WV24IT1 must not be operated outside these absolute maximum ratings.

How does the hardware write-protect (WP) pin function on the X9418WV24IT1?

When the WP pin is driven LOW, the X9418WV24IT1 disables all nonvolatile write operations to its Data Registers (DR0–DR3), preventing accidental or unauthorized changes to stored wiper positions. This protection remains active regardless of I²C command content. The X9418WV24IT1 continues to support volatile wiper updates (e.g., Write WCR, Increment/Decrement) while WP is asserted.

Can the X9418WV24IT1 operate from a single 3.3V supply?

Yes, the X9418WV24IT1 supports VCC from 2.7V to 5.5V, so it operates correctly with a 3.3V system supply. However, its analog section requires separate V+ and V− supplies - for unipolar 0–3.3V signal routing, connect V− to GND and V+ to 3.3V. The X9418WV24IT1's 10kΩ resistance and 64-tap resolution remain fully functional under this configuration.

What is the power-up sequence requirement for reliable wiper register recall in the X9418WV24IT1?

The X9418WV24IT1 requires strict power sequencing: VCC must be applied first, followed by V+ and V−, and finally the potentiometer terminal voltages (VH, VL, VW). VCC must ramp at 0.2–50 V/msec and remain below 0.1V for >1 second before re-powering to ensure DR0 contents reload into the Wiper Counter Register. Failure to follow this sequence may result in undefined wiper position at startup.

Does the X9418WV24IT1 support standard I²C addressing and timing?

Yes, the X9418WV24IT1 uses a standard 7-bit I²C slave address format with fixed 0101b prefix and user-defined A0–A3 bits, supporting up to 16 devices on one bus. It complies with I²C fast-mode timing: 400kHz max clock frequency, tHIGH ≥600ns, tLOW ≥1300ns, and open-drain SDA/SCL with external pull-ups. The X9418WV24IT1 also supports ACK polling during nonvolatile writes.