Renesas X9420WV14IZ-2.7

Overview

X9420WV14IZ-2.7 from Intersil is a single-channel, SPI-interface digitally controlled potentiometer (XDCP™) with 64-tap resolution, 10kΩ end-to-end resistance, ±1 MI absolute linearity, and operation from 2.7V to 5.5V analog supplies (V+/V−) and 2.7V–5.5V digital supply (VCC). It serves as a solid-state replacement for mechanical potentiometers in precision voltage divider and variable resistor applications requiring nonvolatile wiper position storage.

For engineers reviewing the X9420WV14IZ-2.7 datasheet, X9420WV14IZ-2.7 pinout, X9420WV14IZ-2.7 application, or X9420WV14IZ-2.7 equivalent, this device supports SPI register-oriented control of wiper position, stores up to four wiper settings in nonvolatile EEPROM, delivers <1µA standby current, and operates across −40°C to +85°C industrial temperature range in a Pb-free 14-lead TSSOP package.

Technical Context

The X9420WV14IZ-2.7 implements a 63-resistor-segment linear array with CMOS-switched wiper controlled by a volatile 6-bit Wiper Counter Register (WCR). Its SPI interface complies with standard serial clock (SCK), chip select (CS), serial input (SI), and serial output (SO) timing-supporting read/write/transfer instructions with 2–3 byte sequences and an indeterminate-length increment/decrement mode.

It features four 6-bit nonvolatile Data Registers (DR0–DR3) for persistent wiper state storage, hardware write protection (WP), hold functionality (HOLD), and dual-supply architecture: VCC powers digital logic while V+/V− independently bias the analog resistor array. Power-up automatically loads DR0 into the WCR.

Key Specifications

Pinout & Package

Package: 14-lead Thin Shrink Small Outline Plastic (TSSOP), 4.4mm body width, RoHS-compliant Pb-free plus anneal finish (M14.173 drawing).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL22416 and ISL95311, the X9420WV14IZ-2.7 uniquely supports true bipolar analog operation (V+/V−), hardware write protection, and HOLD functionality-making it the only option among the three suitable for precision industrial sensor interfaces requiring robust nonvolatile calibration and noise-immune serial control.

Availability

X9420WV14IZ-2.7 is available at Aetrix Electronics and suitable for industrial sensor calibration, programmable voltage references, and DC-DC converter feedback tuning requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for X9420WV14IZ-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 semiconductor company specializing in precision analog, power management, and interface ICs for industrial, aerospace, and communications markets.

The X9420 product line was designed as a family of digitally controlled potentiometers (XDCP™) to replace mechanical trimmers in applications demanding long-term stability, programmability, and nonvolatile storage of analog settings.

FAQ

What is the recommended power-up sequence for reliable wiper register recall in the X9420WV14IZ-2.7?

The X9420WV14IZ-2.7 requires strict power sequencing: apply VCC first, then V+ and V−, and finally the potentiometer terminals (RH/VH, RL/VL, RW/VW). The VCC ramp rate must stay within 0.2–50 V/msec. If VCC drops below 0.1V, hold it there for >1 second before reapplying power. Failure to follow this sequence may prevent DR0 from loading into the Wiper Counter Register at startup, causing unpredictable wiper position in the X9420WV14IZ-2.7.

Can the X9420WV14IZ-2.7 operate with only a single positive supply, or does it require dual analog rails?

The X9420WV14IZ-2.7 supports both configurations: it can operate with V+ = +5V and V− = 0V (single-supply) or V+ = +5V and V− = −5V (bipolar). The analog terminals (VH/RH, VL/RL, VW/RW) must remain within V− to V+, so bipolar operation enables true AC-coupled signal conditioning. In single-supply mode, VL/RL is typically tied to VSS (0V), and V− is also connected to VSS-verified in the X9420WV14IZ-2.7 datasheet's Recommended Operating Conditions table.

How does hardware write protection (WP pin) affect operation of the X9420WV14IZ-2.7?

When the WP pin is held LOW, the X9420WV14IZ-2.7 blocks all nonvolatile writes to its four Data Registers (DR0–DR3), preventing accidental overwrites of stored calibration values. However, volatile updates to the Wiper Counter Register (WCR) remain fully functional-allowing real-time wiper adjustment via SPI commands or increment/decrement mode. This separation ensures safe field tuning without risking loss of factory-set parameters in the X9420WV14IZ-2.7.

What is the maximum SPI clock frequency supported by the X9420WV14IZ-2.7, and how does it impact timing margins?

The X9420WV14IZ-2.7 supports SPI clock frequencies up to 2.0 MHz, with minimum high/low times of 200 ns each. At this rate, setup/hold times for SI, SCK, CS, and HOLD are all ≥50 ns, and SO output valid time is ≥100 ns after SCK falling edge. These margins ensure reliable communication with standard microcontrollers-even under temperature extremes (−40°C to +85°C)-without requiring custom timing firmware for the X9420WV14IZ-2.7.

Does the X9420WV14IZ-2.7 support daisy-chaining multiple devices on a single SPI bus?

No, the X9420WV14IZ-2.7 does not support daisy-chaining. It uses a standard SPI architecture with individual chip select (CS) lines; each device requires its own dedicated CS signal. However, up to two X9420WV14IZ-2.7 units can share the same SCK, SI, and SO lines by using the A0 pin to differentiate slave addresses-enabling multi-pot control with minimal MCU pin overhead, as documented in the X9420WV14IZ-2.7 Address/Identification Byte Format.