Renesas X9221AYPI

Overview

X9221AYPI 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 industrial temperature range (–40°C to +85°C), and functions as a precision programmable resistor in analog signal conditioning circuits.

For engineers reviewing the X9221AYPI datasheet, X9221AYPI pinout, X9221AYPI application, or X9221AYPI equivalent, this device serves as a drop-in replacement for mechanical potentiometers in closed-loop gain control, offset trimming, and programmable voltage divider designs requiring EEPROM-backed settings and I²C configurability.

Technical Context

The X9221AYPI integrates two independent 63-element resistor arrays with decoded 6-bit wiper counter registers (WCR), each backed by four nonvolatile data registers (DR0–DR3). Wiper position is controlled via I²C commands including direct write, register transfer, and real-time increment/decrement modes.

Its 2-wire interface complies with standard I²C timing (fSCL ≤ 100 kHz), supports slave address configuration via A0–A3 pins, and features acknowledge polling during 10 ms nonvolatile writes. Power-up automatically loads DR0 into each WCR, ensuring repeatable startup behavior without host intervention.

Key Specifications

Pinout & Package

Package: 20-lead plastic DIP (PDIP), 0.300" wide, RoHS-compliant (Pb-free anneal finish), MDP0031 package drawing.

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 X9221AYPI uniquely delivers dual-channel operation with on-chip nonvolatile register storage, I²C register-oriented command architecture, and power-up DR0 auto-load - reducing BOM count and eliminating boot-time host initialization overhead.

Availability

X9221AYPI is available at Aetrix Electronics and suitable for industrial instrumentation, medical signal conditioning, and programmable power supply design requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for X9221AYPI 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 company specializing in precision analog and power management ICs for industrial, communications, and computing markets.

The X9221A product line was designed specifically for replacing mechanical potentiometers in digitally calibrated analog systems - emphasizing nonvolatile setting retention, I²C configurability, and dual-channel integration in compact DIP/SOIC packages.

FAQ

What is the total resistance value and tolerance of the X9221AYPI?

The X9221AYPI has a nominal total resistance of 10 kΩ with a tolerance of ±20% across the full operating temperature range. This value is specified in the Ordering Information table and confirmed in the Analog Characteristics section of the FN8163 datasheet. The resistance remains stable under 50 mW per potentiometer at +25°C, and the device maintains linearity within ±1 MI absolute and ±0.2 MI relative error bands.

Does the X9221AYPI support I²C standard-mode or fast-mode timing?

The X9221AYPI supports standard-mode I²C operation up to 100 kHz maximum clock frequency (fSCL), with minimum tLOW = 4700 ns and tHIGH = 4000 ns. It does not support fast-mode (400 kHz) or high-speed mode. These timing parameters are fully specified in the AC Characteristics table (Page 12) and validated across the industrial temperature range (–40°C to +85°C).

How many nonvolatile registers does the X9221AYPI provide per potentiometer?

The X9221AYPI provides four nonvolatile data registers (DR0–DR3) per potentiometer, totaling eight nonvolatile registers. Each register can store a 6-bit wiper position value. DR0 is automatically loaded into the corresponding wiper counter register (WCR) at power-up, while DR1–DR3 require explicit transfer commands (XFR Data Register to WCR) to affect wiper position.

What is the wiper response time after issuing a STOP condition for the X9221AYPI?

The wiper response time after generating a STOP condition is 1000 µs maximum (tSTPWV), as specified in the AC Characteristics table (Page 12). This delay reflects the time required for the internal switch matrix to settle after a write command completes. For real-time adjustments, the Increment/Decrement mode offers sub-microsecond per-step response synchronized to SCL edges.

Can the X9221AYPI operate from a 3.3 V supply?

No, the X9221AYPI is specified only for 5 V ±10% operation (4.5 V to 5.5 V), as stated in the Recommended Operating Conditions table (Page 9). Supplying 3.3 V falls outside the valid VCC range and will result in undefined behavior, including failure to recognize I²C start conditions, incorrect wiper positioning, or inability to execute nonvolatile writes. A level-shifting interface does not resolve the core VCC requirement.