Renesas X9401WS24I-2.7T1

Overview

X9401WS24I-2.7T1 from Intersil is a quad digitally controlled potentiometer (XDCP™) with 64-tap resolution per channel, SPI serial interface, 10 kΩ end-to-end resistance, and 2.7 V to 5.5 V supply operation. It functions as four independent three-terminal potentiometers or two-terminal variable resistors in analog signal conditioning, voltage regulation feedback, and precision offset adjustment circuits.

For engineers reviewing the X9401WS24I-2.7T1 datasheet, X9401WS24I-2.7T1 pinout, X9401WS24I-2.7T1 application, or X9401WS24I-2.7T1 equivalent, key selection criteria include wiper resistance (150 Ω typ), nonvolatile data register storage (4 × 6-bit per pot), standby current (<3 µA), SPI timing compliance (2 MHz max), and SOIC-24 package compatibility with industrial temperature range (–40°C to +85°C).

Technical Context

The X9401WS24I-2.7T1 implements four independent resistor arrays-each with 63 discrete segments and 64 tap points-controlled by volatile Wiper Counter Registers (WCR) and backed by four nonvolatile Data Registers (DR0–DR3) per pot. Each WCR drives CMOS switches selecting one wiper position per array, enabling precise digital control of analog voltage division or resistance.

Its SPI interface supports full-duplex communication with CS, SCK, SI, and SO pins, plus hardware features including HOLD for serial pause, WP for write protection, and A0/A1 for device addressing up to four units on one bus. Power-up automatically loads DR0 into each WCR, ensuring repeatable startup wiper positions.

Key Specifications

Pinout & Package

Package: 24-lead SOIC (300 mil, Pb-free, RoHS compliant, M24.3 drawing).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digitally controlled potentiometer applications.

Compared with AD5204BRUZ10 and MCP42010-I/P, the X9401WS24I-2.7T1 uniquely combines quad-channel SPI control, 64-tap resolution with nonvolatile data registers, and hardware HOLD/WR protection-making it optimal for industrial systems requiring deterministic startup behavior and robust serial bus management.

Availability

X9401WS24I-2.7T1 is available at Aetrix Electronics and suitable for voltage regulation tuning, audio level control, comparator hysteresis setting, and sensor offset calibration requiring stable component supply across industrial temperature ranges and long product lifecycles.

Supply support for X9401WS24I-2.7T1 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 emphasis on industrial, infrastructure, and high-reliability applications.

The X9401 product line was designed for digitally reconfigurable analog signal conditioning-enabling replacement of mechanical potentiometers in systems demanding programmability, repeatability, and nonvolatile calibration storage.

FAQ

What is the supply voltage range supported by the X9401WS24I-2.7T1?

The X9401WS24I-2.7T1 operates from 2.7 V to 5.5 V, making it compatible with both 3.3 V and 5 V logic domains. This range is explicitly defined in the Absolute Maximum Ratings table and validated across the full industrial temperature range (–40°C to +85°C). Operation below 2.7 V may result in undefined wiper behavior or SPI communication failure.

How does the nonvolatile memory function in the X9401WS24I-2.7T1?

The X9401WS24I-2.7T1 contains four 6-bit nonvolatile Data Registers (DR0–DR3) per potentiometer, implemented as EEPROM. Writes to these registers require a CS HIGH-to-LOW transition to initiate nonvolatile storage, completing in 5–10 ms. The Wiper Counter Register (WCR) is volatile but loads DR0 at power-up, preserving calibrated wiper positions without host intervention.

Can the X9401WS24I-2.7T1 be used as a two-terminal variable resistor?

Yes, the X9401WS24I-2.7T1 can operate as a two-terminal variable resistor by connecting either VH or VL to VW (wiper), effectively using only one end terminal and the wiper. This configuration is documented in the Applications section and maintains the same 10 kΩ end-to-end resistance and 150 Ω typical wiper resistance specifications.

What is the maximum SPI clock frequency for reliable communication with the X9401WS24I-2.7T1?

The X9401WS24I-2.7T1 supports SPI clock frequencies up to 2.0 MHz, as specified in the AC Timing table. At this rate, minimum clock high/low times are 200 ns, and setup/hold times for SI, SCK, CS, and HOLD are 50 ns. Exceeding 2 MHz risks timing violations and corrupted register transfers.

Does the X9401WS24I-2.7T1 include hardware write protection?

Yes, the X9401WS24I-2.7T1 includes a dedicated Hardware Write Protect (WP) pin. When WP is held LOW, all nonvolatile writes-including transfers from WCR to Data Registers-are blocked. This prevents accidental overwrites of calibration data during system operation or firmware updates, and WP must be HIGH to enable any nonvolatile store instruction.