Renesas X9221AYSIZ

Overview

X9221AYSIZ from Intersil is a dual digitally controlled potentiometer (XDCP™) with 64-tap resolution per channel, 2 kΩ end-to-end resistance, and 2-wire serial interface. It integrates two independent resistor arrays on a monolithic CMOS IC, each with volatile wiper counter registers and four nonvolatile data registers, enabling precise digital adjustment in analog signal paths for industrial temperature range (-40°C to +85°C) applications.

For engineers reviewing the X9221AYSIZ datasheet, X9221AYSIZ pinout, X9221AYSIZ application, or X9221AYSIZ equivalent, this device supports register-oriented control, direct wiper position writes, nonvolatile storage of up to four settings per pot, and incremental/decremental fine-tuning via SCL clock pulses - critical for embedded calibration, sensor offset trimming, and programmable gain control.

Technical Context

The X9221AYSIZ implements two independent 63-segment resistor arrays with decoded 6-bit wiper counter registers (WCR), where each WCR output selects one of 64 tap points via FET switches. Power-up automatically loads DR0 into each WCR, ensuring repeatable startup behavior.

Its 2-wire interface follows I²C-compatible timing with slave address 0101xxxx_B, supporting read/write operations to WCRs and four nonvolatile data registers per pot. All nonvolatile writes require ≤10 ms and support 100,000 write cycles per bit, with acknowledge polling used to detect completion.

Key Specifications

Pinout & Package

Package: 20-lead SOIC (300-mil, Pb-free), MDP0027 footprint. RoHS-compliant matte tin termination, MSL level per J-STD-020.

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 X9221AYSIZ uniquely combines dual-channel operation, 64-tap precision, I²C compatibility, four nonvolatile register slots per pot, and hardware-supported increment/decrement - making it optimal for space-constrained industrial systems requiring robust, field-updatable analog trimming.

Availability

X9221AYSIZ is available at Aetrix Electronics and suitable for industrial sensor conditioning, programmable power supply feedback networks, and embedded audio control requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for X9221AYSIZ 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 X9221A product line delivers digitally programmable analog components optimized for precision trimming, calibration, and signal conditioning in harsh environments - targeting applications where mechanical potentiometers fail due to wear, vibration, or contamination.

FAQ

What is the maximum clock frequency supported by the X9221AYSIZ 2-wire interface?

The X9221AYSIZ supports a maximum SCL clock frequency of 100 kHz, as specified in its AC characteristics table. This limit ensures reliable setup/hold timing for data valid windows and acknowledge responses. Exceeding 100 kHz may cause communication failures or incomplete register writes. The X9221AYSIZ uses standard I²C-compatible timing parameters including tLOW ≥ 4700 ns and tHIGH ≥ 4000 ns, which align with common microcontroller I²C peripherals operating at standard mode speeds.

Does the X9221AYSIZ retain wiper position after power cycling?

Yes, the X9221AYSIZ retains wiper position after power cycling through automatic recall of Data Register 0 (DR0) into the Wiper Counter Register (WCR) at power-up. This behavior is guaranteed across the -40°C to +85°C industrial temperature range. While the WCR itself is volatile, DR0 is nonvolatile and stores the last written value until overwritten. The X9221AYSIZ does not retain the most recent wiper position unless explicitly written to DR0 before power-down.

Can both potentiometers in the X9221AYSIZ be controlled simultaneously?

Yes, the X9221AYSIZ supports global transfer instructions that operate on both potentiometers simultaneously. The "Global XFR Data Register to WCR" and "Global XFR WCR to Data Register" commands allow synchronized loading of wiper positions or saving of current positions across both channels using a single instruction byte. This eliminates timing skew between channels during calibration sequences and simplifies firmware implementation for matched analog path adjustments.

What is the wiper resistance specification for the X9221AYSIZ?

The X9221AYSIZ has a typical wiper resistance (RW) of 40 Ω to 130 Ω, measured at ±1 mA wiper current. This low on-resistance minimizes voltage error in precision divider configurations and reduces thermal noise contribution. The value remains stable across temperature and is independent of wiper position due to the FET-switch architecture. For applications requiring ultra-low wiper resistance, the X9221AYSIZ's 2 kΩ end-to-end value inherently limits worst-case insertion loss compared to higher-value DCPs.

How many nonvolatile write cycles does the X9221AYSIZ support per register bit?

The X9221AYSIZ supports 100,000 nonvolatile write cycles per bit per register, as confirmed in the datasheet endurance specification. Each of the four data registers per potentiometer (eight total) is rated for this endurance level. Write operations to data registers trigger internal EEPROM programming with a typical 10 ms cycle time, and acknowledge polling must be used to confirm completion before issuing subsequent commands. This endurance rating ensures reliable field recalibration over the product's operational lifetime.