Renesas X9421WV14IZ-2.7

Overview

X9421WV14IZ-2.7 from Intersil is a low-noise, low-power, SPI-interface digitally controlled potentiometer (XDCP™) with 64-tap resolution, 10 kΩ end-to-end resistance, and 2.7 V to 5.5 V supply operation. It integrates volatile wiper counter register (WCR) and four non-volatile data registers for storing multiple wiper positions, enabling precise analog parameter adjustment in voltage amplifier gain control, sensor signal conditioning, and DC bias trimming circuits.

For engineers reviewing the X9421WV14IZ-2.7 datasheet, X9421WV14IZ-2.7 pinout, X9421WV14IZ-2.7 application, or X9421WV14IZ-2.7 equivalent, key selection criteria include its 14-lead TSSOP package, -40°C to +85°C industrial temperature range, Pb-free RoHS compliance, and support for SPI read/write/transfer operations with hardware write protection (WP) and hold functionality.

Technical Context

The X9421WV14IZ-2.7 implements a monolithic CMOS 63-resistor-segment array with CMOS switches controlled by a 6-bit Wiper Counter Register (WCR), enabling precise 1.6% resolution wiper positioning. Its SPI interface supports eight instructions-including Read/Write WCR, Read/Write Data Registers, XFR between registers, Increment/Decrement, and Read Status-with timing-critical high-voltage write cycles requiring up to 10 ms for nonvolatile storage.

Power-on recall loads DR0 into the volatile WCR, while hardware write protect (WP) disables nonvolatile writes to data registers without affecting WCR updates. The device features <5 µA standby current, 150 Ω typical wiper resistance at 5 V, and 100-year data retention with 100,000 endurance cycles per bit-optimized for stable analog tuning in embedded systems where mechanical potentiometers fail due to wear or environmental stress.

Key Specifications

Pinout & Package

14-lead TSSOP (4.4 mm wide), RoHS-compliant, Pb-free matte tin termination (e3), MSL Level 3 per J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL22416 and ISL22419, the X9421WV14IZ-2.7 offers SPI-native operation, HOLD/CS flow control, and compact 14-lead TSSOP packaging-making it optimal for space-constrained, SPI-based industrial controllers where deterministic serial timing and low standby current are prioritized over maximum tap count.

Availability

X9421WV14IZ-2.7 is available at Aetrix Electronics and suitable for industrial sensor calibration, audio equipment manufacturing, and RF power amplifier biasing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for X9421WV14IZ-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 (now part of Renesas Electronics) is a U.S.-based semiconductor company specializing in precision analog, power management, and interface ICs for industrial, communications, and computing markets.

The X9421 product line delivers digitally programmable analog tuning elements optimized for replacing mechanical potentiometers in harsh environments, with emphasis on nonvolatile storage, low power, and robust SPI interoperability.

FAQ

What is the operating voltage range for the X9421WV14IZ-2.7?

The X9421WV14IZ-2.7 operates from 2.7 V to 5.5 V, making it compatible with both 3.3 V and 5 V system rails. This range is explicitly specified in the Absolute Maximum Ratings table of FN8196 Rev.1.00, and the device maintains full functionality-including SPI communication, wiper positioning, and nonvolatile register access-across this entire supply window. The -2.7 suffix denotes this extended low-voltage capability.

Does the X9421WV14IZ-2.7 retain its wiper position after power cycling?

Yes, the X9421WV14IZ-2.7 automatically loads the contents of Data Register 0 (DR0) into the volatile Wiper Counter Register (WCR) on power-up. This power-on recall function ensures that the last-saved or factory-calibrated wiper position is restored without host intervention. DR0 itself retains its value for 100 years, guaranteeing persistent settings across decades of operation.

How many wiper positions does the X9421WV14IZ-2.7 support, and what is the resolution?

The X9421WV14IZ-2.7 supports 64 discrete wiper positions across its 10 kΩ resistor array, corresponding to 6-bit resolution. Each step represents approximately 1.6% of full-scale resistance, enabling precise analog adjustments in applications such as gain control and offset trimming. This is confirmed by the "64 Resistor Taps" feature and "64-taps" block diagram annotation in the FN8196 datasheet.

Can the X9421WV14IZ-2.7 be used with an I²C microcontroller?

No, the X9421WV14IZ-2.7 uses an SPI serial interface only-it does not support I²C protocol. Communication requires CS, SCK, SI, and SO signals with specific timing (e.g., rising-edge data latch on SI, falling-edge data output on SO). An I²C host would require an SPI-to-I²C bridge or firmware-level bit-banging emulation, neither of which is supported natively by the X9421WV14IZ-2.7.

What is the purpose of the HOLD pin on the X9421WV14IZ-2.7?

The HOLD pin on the X9421WV14IZ-2.7 allows pausing an ongoing SPI transaction without resetting the command sequence. When asserted LOW while SCK is LOW, it suspends communication; bringing HOLD HIGH (with SCK still LOW) resumes from the exact point of interruption. This enables time-critical MCU tasks to preempt SPI transfers without losing state-unlike CS deassertion, which aborts the operation.