Renesas X9221AYP

Overview

X9221AYP 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 commercial temperature range (0°C to +70°C), and is packaged in 20-lead SOIC. It replaces mechanical potentiometers in precision gain/offset trimming and sensor calibration circuits.

For engineers reviewing the X9221AYP datasheet, X9221AYP pinout, X9221AYP application, or X9221AYP equivalent, key selection considerations include its dual-pot architecture, 100,000-cycle endurance per register, 2kΩ/10kΩ/50kΩ end-to-end resistance options, volatile WCR with nonvolatile DR0–DR1 backup, and compatibility with standard 2-wire bus timing (fSCL ≤ 100 kHz).

Technical Context

The X9221AYP integrates two independent 63-segment resistor arrays, each controlled by a 6-bit volatile Wiper Counter Register (WCR) and four nonvolatile Data Registers (DR0–DR3). Wiper position is set via direct WCR write, register transfer, or increment/decrement commands - all executed over a bidirectional open-drain SDA line synchronized to SCL.

Each potentiometer supports three-terminal potentiometer or two-terminal variable resistor configurations. Power-up automatically loads DR0 into the corresponding WCR. Nonvolatile writes require up to 10 ms and support ACK polling; wiper response after stop condition is ≤1000 µs.

Key Specifications

Pinout & Package

Package: 20-lead SOIC (300-mil, MDP0027), RoHS-compliant Pb-free option available.

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 X9221AYP uniquely delivers dual 64-tap pots with nonvolatile multi-position storage, I²C compatibility, and guaranteed power-up recall from DR0 - making it optimal for space-constrained, calibration-critical analog front-ends requiring zero-host-initialization startup behavior.

Availability

X9221AYP is available at Aetrix Electronics and suitable for audio equipment calibration, sensor signal conditioning, laser diode biasing, and programmable power supply design requiring stable component supply and long-term traceability.

Supply support for X9221AYP 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) is a U.S.-based semiconductor designer specializing in precision analog, power management, and interface ICs.

The X9221A series was developed to replace electromechanical potentiometers in automated calibration, industrial control, and communications infrastructure where reliability, programmability, and nonvolatile setting retention are essential.

FAQ

What is the function of the RES pins on the X9221AYP?

The X9221AYP has five RES (Reserved) pins - pins 12, 13, 14, 15, and 20 - all marked "Do not connect" in the datasheet. These pins have no internal connection and must remain unconnected in PCB layout to prevent noise coupling or unintended operation. Connecting them may cause undefined behavior or damage.

Does the X9221AYP support true I²C bus arbitration and multi-master operation?

No. The X9221AYP is a slave-only device with fixed 2-wire protocol implementation. It does not support bus arbitration, clock stretching, or multi-master conflict resolution. It relies on external master control and assumes exclusive bus access during communication sequences, as defined in the FN8163 Rev 2.00 timing diagrams.

How many distinct wiper positions can be stored nonvolatily for each potentiometer in the X9221AYP?

Each potentiometer in the X9221AYP has four nonvolatile Data Registers (DR0–DR3), allowing up to four distinct wiper positions to be stored per channel. DR0 is automatically loaded into the Wiper Counter Register (WCR) at power-up, while DR1–DR3 require explicit register transfer commands to activate.

What is the maximum allowable voltage difference between VH and VL terminals on the X9221AYP?

The absolute maximum voltage difference ΔV = |VH/RH – VL/RL| for the X9221AYP is 10.3 V, as specified in the Absolute Maximum Ratings table. Exceeding this limit risks permanent damage to the resistor array or internal switches, regardless of whether the device is powered or unpowered.

Can the X9221AYP operate with a 3.3 V supply instead of the rated 5 V?

No. The X9221AYP is specified only for 5 V ±10% operation (4.5 V to 5.5 V). Its internal logic thresholds, EEPROM write voltage, and analog switch performance are characterized exclusively within this range. Operation at 3.3 V is outside specification and may result in failed communication, incorrect wiper positioning, or incomplete nonvolatile writes.