Renesas X9401WV24I-2.7T1

Overview

X9401WV24I-2.7T1 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 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 circuits requiring precise, nonvolatile wiper position storage.

For engineers reviewing the X9401WV24I-2.7T1 datasheet, X9401WV24I-2.7T1 pinout, X9401WV24I-2.7T1 application, or X9401WV24I-2.7T1 equivalent, this device supports industrial-grade voltage regulation, offset adjustment, and programmable gain control with <3 µA standby current, 150 Ω typical wiper resistance, and 100-year data retention in its EEPROM registers.

Technical Context

The X9401WV24I-2.7T1 integrates four monolithic CMOS resistor arrays-each with 63 discrete segments and 64 tap points-controlled by individual volatile Wiper Counter Registers (WCRs) and four nonvolatile Data Registers (DR0–DR3) per pot. Its SPI interface operates at up to 2 MHz with CS/SCK/SI/SO/HOLD/ WP pins enabling daisy-chain configuration of up to four devices via A0/A1 address inputs.

Each potentiometer supports three operational modes: direct WCR write/read, transfer between DR and WCR (including global transfers), and real-time increment/decrement via SCK-triggered SI logic. Hardware write protection (WP) disables nonvolatile writes, while HOLD allows pausing active SPI sequences without reset.

Key Specifications

Pinout & Package

Package: 24-lead TSSOP (4.4 mm wide), RoHS-compliant, Pb-free (MDP0044 drawing). Pin assignments match the X9401WV24IZ-2.7 variant per datasheet FN8190 Rev 5.00.

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-2.7T1 uniquely delivers quad-channel SPI control with hardware write protection and TSSOP packaging optimized for compact industrial PCB layouts - making it ideal for multi-parameter analog tuning where pin count, nonvolatility, and layout density are critical.

Availability

X9401WV24I-2.7T1 is available at Aetrix Electronics and suitable for industrial voltage regulation, audio signal conditioning, sensor interface calibration, and programmable power supply design requiring stable component supply and long-term parameter retention.

Supply support for X9401WV24I-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 focus on industrial, infrastructure, and high-reliability applications.

The X9401 product line was designed for digitally reconfigurable analog signal paths in embedded systems requiring nonvolatile calibration, low power, and SPI simplicity - targeting instrumentation, power supplies, and sensor front-ends.

FAQ

What is the supply voltage range supported by the X9401WV24I-2.7T1?

The X9401WV24I-2.7T1 operates from 2.7 V to 5.5 V, as specified in the Absolute Maximum Ratings table of FN8190 Rev 5.00. This extended lower limit enables reliable use in 3.3 V systems and battery-powered applications where brownout conditions may occur. The device maintains full functionality-including SPI communication, wiper positioning, and nonvolatile register access-across this entire range.

Does the X9401WV24I-2.7T1 retain wiper settings after power cycling?

Yes, the X9401WV24I-2.7T1 retains wiper position across power cycles by loading the contents of Data Register 0 (DR0) into the volatile Wiper Counter Register (WCR) at power-up. To preserve a specific setting, users must explicitly store it into DR0 using a Write Data Register command. DR0 is nonvolatile and guarantees 100-year data retention per the datasheet.

How many devices can share the same SPI bus with the X9401WV24I-2.7T1?

Up to four X9401WV24I-2.7T1 devices can share one SPI bus using the A0 and A1 address pins to configure unique 2-bit slave addresses. Each device compares incoming address bits against its physical A0/A1 state; only the matching unit responds to commands. This eliminates external decoding logic and simplifies multi-potentiometer system design.

What is the purpose of the HOLD pin on the X9401WV24I-2.7T1?

The HOLD pin on the X9401WV24I-2.7T1 pauses an ongoing SPI transaction without resetting the internal command state. When asserted LOW during an SCK LOW phase, it freezes data transfer; returning HOLD HIGH (while SCK remains LOW) resumes communication from the exact point of interruption. This feature prevents bus contention in multi-master systems or during host interrupt servicing.

Can the X9401WV24I-2.7T1 be used as a two-terminal variable resistor?

Yes, the X9401WV24I-2.7T1 supports two-terminal operation by connecting either VH or VL to VW (wiper), effectively using only one end of the resistor array and the wiper as the variable terminal. This configuration implements a digitally adjustable rheostat with 64 discrete resistance values ranging from near-zero to 10 kΩ, suitable for current limiting or bias adjustment where three-terminal division is unnecessary.