Renesas X9401WV24I-2.7

Overview

X9401WV24I-2.7 from Intersil is a quad digitally controlled potentiometer (XDCP™) with 64-tap resolution per channel, 10 kΩ end-to-end resistance, SPI serial interface, and operation from 2.7 V to 5.5 V. It integrates four independent resistor arrays with volatile wiper counter registers and four nonvolatile data registers per pot, enabling precise analog voltage/current adjustment in programmable power supplies and sensor calibration circuits.

For engineers reviewing the X9401WV24I-2.7 datasheet, X9401WV24I-2.7 pinout, X9401WV24I-2.7 application, or X9401WV24I-2.7 equivalent, this device supports SPI-based wiper positioning, hardware write protection (WP), hold functionality for bus arbitration, and dual supply-voltage compatibility - critical for low-power industrial control and embedded analog tuning.

Technical Context

The X9401WV24I-2.7 implements four independent 63-segment resistor arrays with CMOS-switched wipers controlled by six-bit Wiper Counter Registers (WCR). Each array supports three-terminal potentiometer or two-terminal variable resistor configurations, with VH/VL terminals defining the voltage range and VW providing the adjustable output.

Its SPI interface operates at up to 2 MHz with rising-edge data capture on SI and falling-edge data output on SO. Communication includes device addressing via A0/A1 pins (supporting up to four devices on one bus), hardware write protection (WP), and HOLD pin for pausing ongoing transfers without resetting the sequence.

Key Specifications

Pinout & Package

Package: 24-lead TSSOP (4.4 mm width), RoHS-compliant, Pb-free (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 X9401WV24I-2.7 delivers native quad-channel SPI control with hardware-level write protection and bus-hold capability - reducing component count and improving reliability in industrial calibration and sensor interface designs where deterministic bus behavior and configuration persistence are critical.

Availability

X9401WV24I-2.7 is available at Aetrix Electronics and suitable for programmable power supplies, industrial sensor interfaces, embedded audio controls, and comparator hysteresis networks requiring stable component supply and long-term calibration retention.

Supply support for X9401WV24I-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 Corporation is a provider of precision analog and power management ICs, now part of Renesas Electronics, with focus on industrial, infrastructure, and high-reliability embedded systems.

The X9401 product line was designed for digitally programmable analog tuning in space-constrained, low-power industrial applications - delivering nonvolatile calibration, SPI simplicity, and quad-channel integration in compact TSSOP packaging.

FAQ

What is the supply voltage range supported by the X9401WV24I-2.7?

The X9401WV24I-2.7 operates from 2.7 V to 5.5 V, making it compatible with both 3.3 V and 5 V logic systems without level translation. This range is explicitly defined in the Absolute Maximum Ratings table and validated across the full –40°C to +85°C industrial temperature range. The X9401WV24I-2.7 maintains specified performance including wiper resistance, RTOTAL tolerance, and SPI timing within this supply window.

How does the hardware write protect (WP) pin function on the X9401WV24I-2.7?

When the WP pin is driven LOW, the X9401WV24I-2.7 blocks all nonvolatile write operations to its data registers (DR0–DR3), preventing accidental overwrites of calibrated wiper positions. Volatile WCR updates remain functional. This feature is implemented at the silicon level and requires no software intervention - ensuring configuration integrity even during unexpected MCU resets or firmware glitches. The X9401WV24I-2.7 datasheet confirms WP is active-low and must be held HIGH to enable nonvolatile writes.

Can the X9401WV24I-2.7 be used as a two-terminal variable resistor?

Yes, the X9401WV24I-2.7 supports two-terminal variable resistor operation by connecting either VH or VL to VW (wiper) and using the remaining terminal as the second connection point. This configuration leverages the same 64-tap resistor array but eliminates the third terminal, enabling current-limiting or gain-setting functions. The X9401WV24I-2.7 datasheet explicitly lists "two-terminal variable resistor" in its Description section and provides application circuits demonstrating this mode.

What is the maximum SPI clock frequency supported by the X9401WV24I-2.7?

The X9401WV24I-2.7 supports SPI clock frequencies up to 2.0 MHz, as specified in the AC Timing table under fSCK parameter. At this rate, instruction execution (e.g., Write Wiper Counter Register) completes within microseconds, and wiper response time after load instructions is guaranteed ≤10 µs. The X9401WV24I-2.7 maintains timing compliance across its full operating voltage and temperature range, with setup/hold times validated down to 50 ns.

Does the X9401WV24I-2.7 include nonvolatile memory for storing wiper positions?

Yes, the X9401WV24I-2.7 includes four nonvolatile 6-bit data registers (DR0–DR3) per potentiometer, allowing persistent storage of up to four distinct wiper positions per channel. Upon power-up, DR0 contents are automatically loaded into the volatile Wiper Counter Register (WCR), restoring the last-saved setting. This nonvolatile memory retains data for 100 years and withstands 100,000 write cycles - confirmed in the Endurance and Data Retention section of the X9401WV24I-2.7 datasheet.