Renesas X9241AMSI

Overview

X9241AMSI from Intersil is a quad digital controlled potentiometer (XDCP™) IC with nonvolatile storage, 2-wire I²C-compatible interface, 64-tap resolution per channel, and -40°C to +85°C industrial temperature range. It integrates four independent resistor arrays (2kΩ/10kΩ/10kΩ/50kΩ configuration), each with volatile wiper counter register (WCR) and four nonvolatile data registers (DR0–DR3), enabling precise analog voltage division in programmable gain amplifiers and sensor calibration circuits.

For engineers reviewing the X9241AMSI datasheet, X9241AMSI pinout, X9241AMSI application, or X9241AMSI equivalent, this device supports cascaded resistor arrays up to 200kΩ, offers 100-year data retention and 100,000-cycle endurance per register, and operates with ±3mA max wiper current at 5V supply - critical for stable biasing in industrial control loops and precision instrumentation.

Technical Context

The X9241AMSI implements four monolithic CMOS resistor arrays, each composed of 63 discrete segments and 64 tap points controlled by a 6-bit Wiper Counter Register (WCR). Each array supports three-terminal potentiometer or two-terminal variable resistor operation with terminal voltage limits of -3.0V to +5V.

It uses a standard 2-wire (I²C-compatible) serial interface with slave address formed by fixed 0101b type identifier plus user-configurable A0–A3 pins. Communication includes ACK polling for nonvolatile write completion (tWR = 10ms), increment/decrement wiper control via SCL edge-triggered logic, and global register transfer commands across all four pots.

Key Specifications

Pinout & Package

20-lead SOIC package (RoHS-compliant, Pb-free matte tin finish), 7.5mm × 12.8mm body, 1.27mm pitch. Pin 1 marked by notch or dot; pin 10 = VSS, pin 20 = VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5204BRZ-10 and MCP41010-I/P, the X9241AMSI uniquely combines quad-channel integration, I²C compatibility, hardware-supported cascading, and guaranteed power-up wiper recall - making it optimal for compact, self-contained analog tuning in industrial control modules.

Availability

X9241AMSI is available at Aetrix Electronics and suitable for industrial control systems, sensor calibration subsystems, and programmable power supply designs requiring stable component supply, long-term lifecycle continuity, and RoHS-compliant packaging.

Supply support for X9241AMSI 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 is a leader in precision analog and power management ICs, delivering high-reliability solutions for industrial, infrastructure, and high-end consumer markets.

The X9241A family was designed specifically for digitally reconfigurable analog signal conditioning - targeting applications needing nonvolatile, multi-channel, and cascade-capable potentiometer functionality in harsh environments.

FAQ

What is the exact resistor value configuration for X9241AMSI?

The X9241AMSI has a fixed resistor array organization: Pot 0 = 2kΩ, Pot 1 = 10kΩ, Pot 2 = 10kΩ, Pot 3 = 50kΩ. This configuration is specified in the Ordering Information table of FN8164 Rev 7.00 and applies exclusively to the X9241AMSI variant. The X9241AMSI does not support field-selectable resistance values - the array values are hardwired at manufacture.

Does X9241AMSI support true I²C compliance including clock stretching?

The X9241AMSI implements a 2-wire serial interface compatible with I²C electrical signaling (open-drain SDA/SCL, ACK/NACK, start/stop), but it does not support clock stretching. Its timing parameters (tLOW ≥ 4700ns, tHIGH ≥ 4000ns, fSCL ≤ 100kHz) align with standard-mode I²C, and it responds to slave address 0101b + A3:A0. However, the device never holds SCL low - all operations complete within defined timing windows, so X9241AMSI relies on master-controlled timing only.

How is nonvolatile write completion confirmed for X9241AMSI?

X9241AMSI uses ACK polling to confirm nonvolatile write completion. After issuing a Write Data Register or XFR WCR to Data Register command and stop condition, the host repeatedly sends a start + slave address. If X9241AMSI is still busy (tWR = 10ms max), it withholds ACK. When the internal EEPROM write finishes, it returns ACK - signaling readiness for next command. This method avoids fixed delay waits and is documented in Figure 1 of FN8164 Rev 7.00.

Can X9241AMSI operate with supply voltages other than 5V?

No - the X9241AMSI is rated exclusively for VCC = 5V ±10% (4.5V to 5.5V). Absolute Maximum Ratings specify 5V ±10% as the only valid supply range; operation outside this violates specification and risks parametric failure. Terminal voltages (VH/VL/VW) are limited to -3.0V to +5V relative to VSS, and ΔV across any array must not exceed 10V. The X9241AMSI does not support 3.3V or dual-supply operation.

What happens to wiper position during power cycling of X9241AMSI?

On power-up, the X9241AMSI automatically loads the contents of Data Register 0 (DR0) for each potentiometer into its corresponding volatile Wiper Counter Register (WCR), restoring the last-saved wiper position. This behavior is guaranteed by design and occurs regardless of prior WCR state at power-down. DR0 must be pre-programmed with desired startup values - default DR0 contents are undefined at first power-on unless explicitly written.