Renesas X9241AWSZ

Overview

X9241AWSZ from Intersil is a quad digital controlled potentiometer (XDCP™) IC with nonvolatile storage, 2-wire I²C interface, 64-tap resolution per channel, 10kΩ end-to-end resistance per potentiometer, and SOIC-20 package. It functions as four independent digitally adjustable resistors for precision analog signal conditioning in embedded control systems.

For engineers reviewing the X9241AWSZ datasheet, X9241AWSZ pinout, X9241AWSZ application, or X9241AWSZ equivalent, key selection considerations include its 0°C to +70°C operating range, 5V ±10% supply compatibility, wiper current limits of ±3mA, cascade-capable resistor arrays, and EEPROM-based register retention for power-up recall of DR0 values.

Technical Context

The X9241AWSZ implements four independent 63-element resistor arrays with decoded 6-bit Wiper Counter Registers (WCR), each supporting volatile wiper positioning and four nonvolatile Data Registers (DR0–DR3). Each potentiometer accepts 2-wire serial commands for direct WCR writes, register transfers, and increment/decrement operations.

It operates in normal mode or cascade mode via bit-7 (CM) of the WCR, enabling inter-pot interconnection (e.g., POT2 cascaded to POT3); wiper enable/disable is controlled by bit-6 (DW). Power-up automatically loads DR0 into the corresponding WCR, ensuring deterministic startup behavior without host intervention.

Key Specifications

Pinout & Package

Package: 20-lead SOIC (Small Outline Integrated Circuit), RoHS-compliant, surface-mount, body width 7.5mm, lead pitch 1.27mm.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital potentiometer applications.

Compared with X9241AWSZ, AD5204BRUZ10 offers finer resolution and SPI flexibility but sacrifices I²C simplicity and guaranteed power-up state; MCP42050-I/P reduces cost and complexity but eliminates nonvolatile configuration retention entirely.

Availability

X9241AWSZ is available at Aetrix Electronics and suitable for industrial sensor calibration, programmable gain amplifier setup, audio signal level control, and laser diode bias adjustment requiring stable component supply and long-term obsolescence management.

Supply support for X9241AWSZ 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 designs precision analog and power management ICs for industrial, infrastructure, and high-end consumer markets, emphasizing reliability and signal integrity.

The X9241A family delivers digitally programmable resistance for embedded calibration and analog tuning, targeting applications where mechanical potentiometer replacement, remote adjustment, and nonvolatile state retention are critical.

FAQ

What is the default wiper position after power-up for the X9241AWSZ?

The X9241AWSZ automatically loads the contents of Data Register 0 (DR0) into each potentiometer's Wiper Counter Register (WCR) upon power-up. This ensures repeatable startup behavior without host initialization. The DR0 value must be pre-programmed during manufacturing or field calibration; factory default is not guaranteed and depends on prior nonvolatile writes. For reliable operation, always verify DR0 contents before first power cycle.

Can the X9241AWSZ operate with a 3.3V supply?

No, the X9241AWSZ is specified only for 5V ±10% supply (4.5V to 5.5V). Its absolute maximum VCC is 5.5V, and the recommended operating conditions explicitly require 5V. Using 3.3V will result in insufficient internal biasing, unreliable I²C communication, and failure to drive wiper switches correctly. For 3.3V systems, consider alternatives like the AD5204 or MCP42XX families with dual-supply support.

How does cascade mode work on the X9241AWSZ, and which pins must be connected?

In cascade mode, the VL/RL terminal of a higher-order pot (e.g., POT2) is externally wired to the VH/RH terminal of the next lower-order pot (e.g., POT3), forming a single extended resistor chain. Only one wiper remains enabled (via DW bit = 0); others must be disabled. The active wiper traverses the combined array, and position is read from the corresponding WCR. All VH/RH, VL/RL, and VW/RW connections must be made per Figure 9 in FN8164 Rev 7.00.

What is the maximum allowable voltage across any potentiometer terminal pair on the X9241AWSZ?

The maximum differential voltage |VH/RH − VL/RL| is 10V. Additionally, each terminal (VH/RH, VL/RL, VW/RW) must remain within −3.0V to +5V relative to VSS. Exceeding either limit risks permanent damage to the internal FET switches or resistor array. These constraints apply regardless of whether the pot is used as a 3-terminal potentiometer or 2-terminal variable resistor.

Does the X9241AWSZ support repeated start conditions on the I²C bus?

Yes, the X9241AWSZ fully supports I²C repeated start conditions, with minimum setup time tSU:STA ≥ 4000ns and hold time tHD:STA ≥ 4000ns. This enables efficient multi-byte transactions (e.g., writing to multiple registers) without releasing the bus, reducing protocol overhead and improving host firmware efficiency in time-critical calibration routines.