Renesas X9401WV24IZ

Overview

X9401WV24IZ from Intersil is a quad-channel, 64-tap digitally controlled potentiometer (XDCP™) with SPI interface, 10 kΩ end-to-end resistance, 150 Ω typical wiper resistance, and nonvolatile data registers for wiper position storage. It operates from 2.7 V to 5 V and supports industrial temperature range (–40°C to +85°C) in a 24-lead TSSOP package, used for precision analog trimming in power supply feedback loops, sensor calibration, and programmable gain amplifiers.

For engineers reviewing the X9401WV24IZ datasheet, X9401WV24IZ pinout, X9401WV24IZ application, or X9401WV24IZ equivalent, key selection criteria include SPI-compatible 24-pin TSSOP packaging, 64-step resolution per pot, volatile wiper counter with four nonvolatile data registers per channel, hardware write protection (WP), and hold functionality for serial bus arbitration.

Technical Context

The X9401WV24IZ implements four independent resistor arrays-each with 63 discrete segments and 64 tap points-controlled by six-bit Wiper Counter Registers (WCRs). Each WCR drives CMOS switches selecting a single wiper connection point, enabling precise voltage division or variable resistance operation.

It uses standard SPI protocol (CS, SCK, SI, SO) with device addressing via A0/A1 pins, supports global and per-pot register transfers, and includes hardware write protection (WP) and HOLD for multi-device bus management. Nonvolatile writes require CS high-to-low transition and complete within 10 ms.

Key Specifications

Pinout & Package

Package: 24-lead TSSOP (4.4 mm wide), 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 AD5204BRUZ10 and MCP42050-I/SL, the X9401WV24IZ uniquely combines SPI compatibility, hardware HOLD/HP, four nonvolatile registers per pot, and 10 kΩ resistance in a 24-lead TSSOP - making it optimal for industrial systems requiring deterministic bus control and guaranteed power-on wiper position.

Availability

X9401WV24IZ is available at Aetrix Electronics and suitable for industrial power supply trimming, sensor calibration, programmable audio attenuation, and comparator hysteresis control requiring stable component supply and long-term lifecycle support.

Supply support for X9401WV24IZ 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 applications.

The X9401 product line delivers digitally programmable analog functions for systems requiring repeatable, nonvolatile, and remotely adjustable resistance - targeting power management, test equipment, and sensor interface designs.

FAQ

What is the power-up behavior of the X9401WV24IZ?

At power-up, the X9401WV24IZ automatically loads the contents of Data Register 0 (R0) into each potentiometer's volatile Wiper Counter Register (WCR), establishing the initial wiper position. This behavior ensures deterministic startup without requiring host initialization. The X9401WV24IZ does not retain WCR state across power cycles unless explicitly stored to R0, and R0 itself is nonvolatile with 100-year data retention.

Does the X9401WV24IZ support true 3-wire SPI mode?

Yes, the X9401WV24IZ supports 3-wire SPI operation: SI and SO can be connected together because SO is three-state and SI is input-only. During reads, SO drives the shared line; during writes, SI receives while SO is high-impedance. This reduces host pin count without sacrificing full-duplex capability, and is explicitly validated in the FN8190 datasheet Section "Serial Interface".

How does hardware write protection (WP) affect nonvolatile operations on the X9401WV24IZ?

When the WP pin is held LOW, the X9401WV24IZ blocks all nonvolatile write operations-including storing wiper positions to Data Registers (R0–R3) and executing XFR commands that write to nonvolatile memory. Volatile WCR updates remain functional. This hardware lock prevents accidental register corruption during system debug or field updates, and WP status is independent of CS or HOLD state.

Can the X9401WV24IZ be used as a 2-terminal variable resistor?

Yes, the X9401WV24IZ supports two-terminal rheostat configuration: connect either VH or VL to the wiper (VW), leaving the other terminal unconnected or grounded. In this mode, resistance varies from near-zero (WCR = 0x00 or 0x3F) to 10 kΩ (full array), with wiper resistance (150 Ω typical) contributing minimally to total on-resistance - verified in Analog Specifications Table on page 11 of FN8190 Rev 5.00.

What is the maximum SPI clock frequency supported by the X9401WV24IZ?

The X9401WV24IZ supports SPI clock frequencies up to 2.0 MHz, as specified in the AC Timing table (page 13 of FN8190 Rev 5.00). At this rate, instruction execution time remains consistent: read/write WCR operations complete within 10 µs, and nonvolatile store cycles (tWR) take 5–10 ms. Timing margins comply with tSU, tH, tWH, and tWL requirements across the full industrial temperature range.