Renesas X9221AWS

Overview

X9221AWS from Intersil is a dual digitally controlled potentiometer (XDCP™) with 64-tap resolution per channel, 2-wire I²C-compatible serial interface, and 10 kΩ end-to-end resistance. It integrates two independent resistor arrays, each with volatile wiper counter registers and four nonvolatile data registers, enabling precise digital adjustment of analog signals in real-time control loops and calibration circuits.

For engineers reviewing the X9221AWS datasheet, X9221AWS pinout, X9221AWS application, or X9221AWS equivalent, this device supports dual-channel wiper position read/write, nonvolatile storage of up to four settings per pot, and incremental/decremental fine-tuning via SCL clock pulses - critical for embedded sensor calibration, power supply trimming, and audio level control where repeatable, field-updatable analog gain/offset is required.

Technical Context

The X9221AWS implements two independent 63-segment resistor arrays with FET-switched wipers controlled by 6-bit Wiper Counter Registers (WCR). Each potentiometer features four nonvolatile Data Registers (DR0–DR1 per channel), supporting direct register-to-WCR transfers and power-up recall from DR0.

Its 2-wire serial interface complies with standard I²C timing (fSCL ≤ 100 kHz), uses open-drain SDA with external pull-up, and supports slave addressing via A0–A3 pins. The device operates at VCC = 5 V ±10% over 0°C to +70°C and requires no external components for basic operation.

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 X9221AWS uniquely delivers dual 64-tap control with I²C simplicity, atomic register transfers, and clock-driven wiper stepping - making it optimal for space-constrained commercial systems needing robust, field-serviceable analog calibration.

Availability

X9221AWS is available at Aetrix Electronics and suitable for audio signal conditioning, DC power supply trimming, sensor signal conditioning, and industrial analog input calibration requiring stable component supply and long-term manufacturing continuity.

Supply support for X9221AWS 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 power management, precision analog, and interface applications.

The X9221AWS belongs to the XDCP™ family of digitally controlled potentiometers engineered for replacing mechanical trimmers in calibration-critical systems where repeatable, nonvolatile, and digitally controllable resistance is required.

FAQ

What is the maximum clock frequency supported by the X9221AWS I²C interface?

The X9221AWS supports a maximum SCL clock frequency of 100 kHz, as specified in its AC characteristics table. This limit ensures reliable communication timing, including tLOW ≥ 4700 ns and tHIGH ≥ 4000 ns. Exceeding 100 kHz may cause missed ACK responses or corrupted register transfers. The X9221AWS does not support fast-mode (400 kHz) or high-speed I²C protocols.

Does the X9221AWS retain wiper position after power cycling?

Yes, the X9221AWS retains wiper position after power cycling by loading the contents of Data Register 0 (DR0) into the Wiper Counter Register (WCR) at power-up. This behavior is automatic and requires no host intervention. However, the WCR itself is volatile - only DR0's stored value persists through power loss, making DR0 the effective "default startup position" for each potentiometer channel.

Can the X9221AWS be used as a two-terminal variable resistor?

Yes, the X9221AWS can operate as a two-terminal variable resistor by connecting either VH/RH or VL/RL to the wiper VW/RW terminal, effectively shorting one end of the resistor array. This configuration yields a 0–10 kΩ adjustable resistance (±20%) between the remaining two terminals. The device maintains full 64-tap resolution and nonvolatile storage capability in this mode.

How many unique slave addresses can be assigned to the X9221AWS on a shared I²C bus?

The X9221AWS supports up to 16 unique slave addresses via its A0–A3 address pins, which configure the four least significant bits of the fixed 8-bit address (0101xxxxB). Each combination of A0–A3 logic levels (0 or 1) yields a distinct address, allowing up to 16 X9221AWS devices - or mixed XDCP devices sharing the same base ID - on a single I²C bus without address conflict.

What is the wiper resistance specification for the X9221AWS and why does it matter?

The X9221AWS specifies wiper resistance (RW) as 40–130 Ω at ±1 mA wiper current. This low on-resistance minimizes voltage drop and signal error when the wiper drives high-impedance loads (e.g., op-amp inputs), preserving linearity and reducing thermal noise. In contrast, higher wiper resistance would introduce gain error in feedback networks and degrade SNR in precision sensor interfaces.