Renesas X9428WP16I-2.7

Overview

X9428WP16I-2.7 from Intersil is a single-channel digitally controlled potentiometer (XDCP™) with 10kΩ end-to-end resistance, 64-tap resolution, and 2-wire (I²C-compatible) serial interface. It operates from 2.7V to 5.5V on VCC and ±2.7V to ±5.5V on analog supplies (V+/V−), features nonvolatile storage of four wiper positions, and is rated for −40°C to +85°C industrial temperature range in 16-lead SOIC package. It serves as a precision, low-noise, low-power replacement for mechanical potentiometers in calibration and bias control circuits.

For engineers reviewing the X9428WP16I-2.7 datasheet, X9428WP16I-2.7 pinout, X9428WP16I-2.7 application, or X9428WP16I-2.7 equivalent, this page delivers verified specifications, validated pin functions, confirmed industrial-grade operating margins, and real-world use cases for analog signal conditioning, power supply trimming, and embedded system parameter tuning - all derived from Intersil FN8197 Rev 1.00.

Technical Context

The X9428WP16I-2.7 implements a 63-segment resistor array with CMOS-switched wiper controlled by a volatile 6-bit Wiper Counter Register (WCR). Its 2-wire interface supports direct read/write/transfer of wiper position and stores up to four settings across four nonvolatile 6-bit Data Registers (DR0–DR3), with DR0 auto-loaded at power-up.

It supports dual-supply analog operation (V+ = +2.7V to +5.5V, V− = −2.7V to −5.5V), enabling true bipolar signal handling. Hardware write protection (WP pin) disables nonvolatile writes, and standby current remains below 1µA - making it suitable for battery-powered instrumentation requiring long-term setting retention.

Key Specifications

Pinout & Package

Package: 16-lead SOIC (300 mil), RoHS-compliant, Pb-free plus anneal option available. Pin 1 marked with dot; pin 9 is VSS (system ground).

Key Features

Applications

Equivalent & Alternatives

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

Compared with X9428WP16I-2.7, ISL22316 offers finer 256-step control and wider temperature tolerance but sacrifices bipolar analog capability and uses SPI instead of I²C; ISL22319 adds channel density at the cost of interface compatibility and package size - making X9428WP16I-2.7 optimal for space-constrained, I²C-based, bipolar-signal designs requiring industrial-grade reliability.

Availability

X9428WP16I-2.7 is available at Aetrix Electronics and suitable for industrial instrumentation, programmable power supplies, audio signal conditioning, and battery-monitoring systems requiring stable component supply, long-term calibration retention, and robust operation across −40°C to +85°C.

Supply support for X9428WP16I-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 manufacturer specializing in precision analog, power management, and interface ICs for industrial, aerospace, and communications markets.

The X9428 product line was designed as a low-noise, low-power, nonvolatile digital potentiometer family targeting calibration-critical applications where mechanical potentiometers introduce reliability and drift issues - especially in battery-operated and thermally demanding environments.

FAQ

What is the maximum allowable voltage difference between V+ and V− for X9428WP16I-2.7?

The absolute maximum voltage difference between V+ and V− is 12V, as specified in the Absolute Maximum Ratings table. Operation beyond this limit risks permanent damage. For X9428WP16I-2.7, V+ may range from +2.7V to +5.5V and V− from −2.7V to −5.5V, so typical use cases maintain |V+ − V−| ≤ 11V (e.g., +5.5V/−5.5V). The X9428WP16I-2.7 must never see V+ ≤ V− or exceed the 12V differential ceiling.

Does X9428WP16I-2.7 support true I²C standard-mode timing?

Yes, X9428WP16I-2.7 fully complies with I²C standard-mode timing: clock frequency up to 400kHz, tHIGH ≥ 600ns, tLOW ≥ 1300ns, and tSU:STA/tHD:STA ≥ 600ns. Its open-drain SDA and Schmitt-triggered SCL inputs meet I²C electrical requirements. Pull-up resistors must be selected per bus capacitance - e.g., 4.7kΩ for ≤200pF - and the X9428WP16I-2.7 acknowledges valid slave addresses and data bytes as defined in the I²C specification.

How does power-up behavior work for X9428WP16I-2.7?

At power-up, the X9428WP16I-2.7 loads the contents of Data Register 0 (DR0) into the volatile Wiper Counter Register (WCR), establishing the initial wiper position. This occurs only after all three supplies (VCC, V+, V−) stabilize within 1ms of each other. The X9428WP16I-2.7 does not function until stabilization completes, and wiper movement is delayed by tWRL (≤10µs) after DR0 transfer. No external reset is required - the X9428WP16I-2.7 is self-initializing.

Can X9428WP16I-2.7 be used in a single-supply analog configuration?

Yes, X9428WP16I-2.7 supports single-supply analog operation: set V+ = VCC (e.g., +5V) and V− = VSS (0V), then connect RH/VH to V+, RL/VL to VSS. In this mode, the wiper (RW/VW) delivers 0V to V+ proportionally. All specifications - including 10kΩ resistance, 64-tap resolution, and noise performance - remain valid. The X9428WP16I-2.7 does not require dual supplies unless bipolar signal handling is needed.

What happens to wiper position during a nonvolatile write to DR0–DR3?

During a nonvolatile write (e.g., "XFR WCR to DR0"), the X9428WP16I-2.7 disables its analog inputs for the duration of the internal EEPROM programming cycle (tWR = 5–10ms). The wiper position remains frozen at its pre-write value until the operation completes. Acknowledge polling can detect completion: issue START + slave address; if no ACK, the X9428WP16I-2.7 is still busy. Once ACK is received, the new DR value is stored and ready for recall.