Renesas X9221AWPI

Overview

X9221AWPI from Intersil is a dual digitally controlled potentiometer (XDCP™) with 64-tap resolution per channel, 2-wire I²C-compatible serial interface, and nonvolatile storage of four wiper positions per pot. It operates at 5V ±10%, supports 0°C to +70°C ambient, and functions as a programmable voltage divider or variable resistor in analog signal conditioning circuits.

For engineers reviewing the X9221AWPI datasheet, X9221AWPI pinout, X9221AWPI application, or X9221AWPI equivalent, this device enables precise digital calibration of gain, offset, and bias in mixed-signal systems without mechanical adjustment-critical for production repeatability, field recalibration, and embedded system parameter tuning.

Technical Context

The X9221AWPI integrates two independent 63-element resistor arrays with decoded 6-bit wiper counter registers (WCR), each backed by four nonvolatile data registers (DR0–DR1 per pot). Its 2-wire interface uses open-drain SDA with pull-up and edge-triggered SCL, supporting standard I²C timing (fSCL ≤ 100 kHz, tLOW ≥ 4.7 µs).

Each potentiometer supports volatile wiper positioning via Write WCR, nonvolatile register transfers (XFR WCR ↔ DR), and real-time increment/decrement control. Power-up loads DR0 into the respective WCR, ensuring deterministic startup behavior without host initialization.

Key Specifications

Pinout & Package

Package: 20-lead plastic DIP (PDIP), 0.300" wide, RoHS-compliant (Pb-free plus anneal).

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 X9221AWPI uniquely delivers dual 64-tap pots with automatic DR0 power-up recall and 5V-only compatibility-making it optimal for cost-sensitive, space-constrained commercial instrumentation requiring deterministic startup and simple I²C integration.

Availability

X9221AWPI is available at Aetrix Electronics and suitable for audio level control, DC bias calibration, laser diode current trim, and power supply feedback tuning requiring stable component supply and long-term manufacturing continuity.

Supply support for X9221AWPI 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 X9221A family was engineered specifically for digital replacement of mechanical potentiometers in calibration-critical analog systems-emphasizing nonvolatile storage, I²C simplicity, and robust commercial-temperature operation.

FAQ

What is the maximum clock frequency supported by the X9221AWPI I²C interface?

The X9221AWPI supports a maximum SCL clock frequency of 100 kHz, with minimum LOW and HIGH periods of 4.7 µs and 4.0 µs respectively. This aligns with standard-mode I²C timing and ensures reliable communication in noise-immune industrial environments where slower bus speeds improve robustness against EMI.

Does the X9221AWPI retain wiper settings after power loss?

Yes-the X9221AWPI retains wiper positions in nonvolatile data registers (DR0–DR1), with guaranteed 100,000 write cycles and 100-year data retention. However, the volatile wiper counter register (WCR) resets on power-down; power-up automatically loads DR0 into the WCR, restoring the last stored setting for each potentiometer.

Can the X9221AWPI be used as a two-terminal variable resistor?

Yes-the X9221AWPI supports both three-terminal potentiometer and two-terminal variable resistor configurations. In two-terminal mode, one end terminal (e.g., VL/RL) and the wiper (VW/RW) are used, while the other end (VH/RH) is left unconnected or tied to VL/RL. This is explicitly confirmed in the datasheet description and block diagram.

What is the purpose of the RES pins on the X9221AWPI?

The RES pins (pins 11–14 and 16–19) are reserved and have no internal connection. The datasheet mandates they remain unconnected in all applications. Connecting them may cause unpredictable behavior or violate absolute maximum ratings due to floating or unintended coupling paths.

How many unique I²C addresses can be assigned to the X9221AWPI?

The X9221AWPI supports 16 unique I²C slave addresses via the A0–A3 pins, which configure the 4 LSBs of the fixed 8-bit address (0101xxxx₂). Each combination of A0–A3 states allows up to 16 devices on the same bus-enabling scalable multi-channel calibration in systems like modular test equipment or multi-sensor nodes.