Renesas X9221AUST2

Overview

X9221AUST2 from Intersil is a dual digitally controlled potentiometer (XDCP™) with 64-tap resolution per channel, 2-wire I²C-compatible serial interface, and nonvolatile storage for up to four wiper positions per pot. It operates at 5V ±10%, supports industrial temperature range (–40°C to +85°C), and is used in precision analog trimming, sensor calibration, and programmable gain control circuits.

For engineers reviewing the X9221AUST2 datasheet, X9221AUST2 pinout, X9221AUST2 application, or X9221AUST2 equivalent, key selection criteria include its dual-pot architecture, 100,000-cycle endurance per register, 20-lead SOIC package, 2kΩ/10kΩ/50kΩ end-to-end resistance options, and support for global register transfer and incremental wiper adjustment.

Technical Context

The X9221AUST2 integrates two independent 63-element resistor arrays with decoded 6-bit wiper counter registers (WCR), each backed by four nonvolatile data registers (DR0–DR1). Communication uses standard 2-wire I²C protocol with slave address 0101xxxx₂, where A0–A3 set LSBs.

Each pot supports volatile wiper positioning via Write WCR, nonvolatile storage via Write Data Register, and atomic transfers between registers and WCR. Power-up loads DR0 into the respective WCR. Wiper response time is ≤1 ms after STOP, and nonvolatile writes require ≤10 ms with ACK polling support.

Key Specifications

Pinout & Package

Package: 20-lead SOIC (300-mil body, MDP0027 footprint), RoHS-compliant Pb-free plus anneal finish.

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 X9221AUST2 uniquely delivers dual-channel operation with integrated nonvolatile register storage and global transfer - reducing component count and simplifying calibration workflows in industrial analog systems.

Availability

X9221AUST2 is available at Aetrix Electronics and suitable for industrial instrumentation, sensor signal conditioning, and programmable analog front-ends requiring stable component supply, long-term calibration retention, and I²C-based remote trimming.

Supply support for X9221AUST2 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 (now part of Renesas Electronics) designs high-performance analog and mixed-signal ICs for industrial, computing, and communications markets.

The X9221AUST2 belongs to the XDCP™ family of digitally controlled potentiometers, engineered specifically for replacing mechanical trimmers in automated calibration, sensor compensation, and programmable analog signal paths.

FAQ

What is the end-to-end resistance value of the X9221AUST2?

The X9221AUST2 is configured with a 10kΩ end-to-end resistance (RTOTAL), as indicated by the "AWS" ordering suffix in the Intersil datasheet FN8163. This value is fixed per unit and cannot be changed in-circuit. The 10kΩ option balances low power consumption (50 mW per pot) with sufficient resolution for most precision analog adjustments, and matches common op-amp feedback network design practices.

Does the X9221AUST2 retain wiper settings after power loss?

Yes, the X9221AUST2 retains wiper positions using nonvolatile data registers (DR0–DR1). While the volatile Wiper Counter Register (WCR) resets on power-down, DR0 is automatically loaded into the WCR at power-up. Users can store up to four distinct wiper positions per pot in nonvolatile memory, with 100,000 write cycles and 100-year data retention specified. The X9221AUST2 thus ensures deterministic startup behavior without external memory.

How does the 2-wire interface of the X9221AUST2 differ from standard I²C?

The X9221AUST2 implements a 2-wire interface fully compatible with standard I²C electrical signaling (open-drain SDA, clocked SCL, START/STOP conditions), but uses a proprietary instruction set and addressing scheme. Its slave address is fixed as 0101xxxx₂, with A0–A3 setting the LSBs. Unlike standard I²C peripherals, it does not support repeated START or arbitrary register reads - commands follow strict 2- or 3-byte sequences defined in the FN8163 datasheet for X9221AUST2.

Can both potentiometers in the X9221AUST2 be controlled simultaneously?

Yes, the X9221AUST2 supports simultaneous control via global instructions: Global XFR Data Register to WCR and Global XFR WCR to Data Register. These commands act on both potentiometers at once, enabling synchronized wiper movement or unified calibration save/load. However, direct wiper writes (Write WCR), reads (Read WCR), and increment/decrement operations are channel-selective and require P0 bit setting in the instruction byte for X9221AUST2.

What package type and lead count does the X9221AUST2 use?

The X9221AUST2 uses a 20-lead SOIC package (300-mil width, MDP0027 footprint) with Pb-free plus anneal finish compliant with RoHS. It measures 7.5 mm × 12.8 mm with 1.27 mm lead pitch. This package supports standard reflow profiles and offers better thermal performance and board density than the PDIP variant, making it suitable for compact industrial PCBs where reliability and manufacturability are critical for X9221AUST2 deployment.