Renesas X9241AMS

Overview

X9241AMS from Intersil is a quad digital controlled potentiometer (XDCP™) IC integrating four nonvolatile, low-power, 2-wire interface potentiometers with 64-tap resolution per channel. Each potentiometer features independent volatile wiper counter registers (WCR) and four nonvolatile data registers (DR0–DR3), supporting direct wiper control, position storage, and power-up recall from DR0. It operates at 5V ±10%, supports terminal voltages up to +5V/–3.0V, and is used in precision analog trimming, sensor calibration, and programmable gain control circuits.

For engineers reviewing the X9241AMS datasheet, X9241AMS pinout, X9241AMS application, or X9241AMS equivalent, this page delivers verified technical context including 2-wire I²C-compatible interface timing, cascaded resistor array configuration, wiper current limits (±3mA for 10k/50kΩ arrays), nonvolatile register endurance (100,000 cycles), and SOIC-20 package mechanical details - all confirmed from FN8164 Rev 7.00.

Technical Context

The X9241AMS implements four independent 63-segment resistor arrays, each controlled by a 6-bit Wiper Counter Register decoded to select one of 64 tap points. Wiper position is updated via serial 2-wire interface using instruction-based commands (e.g., Write WCR, XFR Data Register to WCR), with acknowledge polling support for nonvolatile writes.

Each potentiometer supports cascade mode via CM bit (bit 7 of WCR), enabling inter-array linking for extended resistance values (e.g., 4kΩ–200kΩ). The device uses open-drain SDA with external pull-up, complies with standard I²C timing (fSCL ≤ 100 kHz), and maintains wiper isolation when DW bit (bit 6) is set.

Key Specifications

Pinout & Package

Package: 20-lead SOIC (RoHS-compliant, Pb-free matte tin finish), body dimensions 7.50 mm × 12.80 mm × 2.35 mm (JEDEC MS-013).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5204BRZ-10 and MCP42050-I/P, the X9241AMS offers unique I²C compatibility, guaranteed 100-year nonvolatile retention, and hardware-enabled cascade mode-making it optimal for compact, self-contained, long-life analog calibration systems requiring minimal external components.

Availability

X9241AMS is available at Aetrix Electronics and suitable for audio signal conditioning, laser diode biasing, sensor offset compensation, and programmable power supply trimming requiring stable component supply and long-term calibration integrity.

Supply support for X9241AMS 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 leading provider of precision analog and power management ICs, now part of Renesas Electronics, with deep expertise in high-reliability industrial and infrastructure solutions.

The X9241A family was designed specifically for digitally reconfigurable analog signal paths in instrumentation, telecom, and industrial control-emphasizing nonvolatile parameter storage, low-power operation, and robust 2-wire interface compliance.

FAQ

What is the maximum clock frequency supported by the X9241AMS 2-wire interface?

The X9241AMS supports a maximum SCL clock frequency of 100 kHz, as specified in its AC Electrical Specifications. This limit ensures reliable acknowledge timing, proper setup/hold margins (tSU:STA ≥ 4 µs, tHD:STA ≥ 4 µs), and noise immunity under standard I²C bus conditions. Exceeding 100 kHz may cause communication failures or incomplete nonvolatile writes. The X9241AMS remains fully functional within this constraint for typical microcontroller-based host implementations.

Does the X9241AMS retain wiper positions after power cycling?

Yes, the X9241AMS automatically loads the contents of Data Register 0 (DR0) into the volatile Wiper Counter Register (WCR) on power-up, ensuring consistent wiper positioning across cycles. This behavior is guaranteed by design and does not require host intervention. However, DR0 must be pre-programmed with the desired value-either during manufacturing or runtime-since power-down does not auto-save the final WCR state unless explicitly transferred via XFR WCR to Data Register command.

Can the four potentiometers in the X9241AMS be configured with different resistance values?

Yes, the X9241AMS supports mixed resistance configurations: Pot 0 = 2kΩ, Pot 1 = 10kΩ, Pot 2 = 10kΩ, Pot 3 = 50kΩ-as confirmed in the Ordering Information table for X9241AMSZ*. This per-channel value assignment is fixed at manufacture and cannot be altered in-circuit. Resistance selection is determined by the specific ordering variant; the X9241AMS part number corresponds to this exact combination and operating temperature range (0°C to +70°C).

What is the purpose of the CM and DW bits in the X9241AMS Wiper Counter Register?

The CM (Cascade Mode) bit (bit 7) enables inter-potentiometer resistor array linking-e.g., setting CM=1 in WCR2 cascades POT2 with POT3. The DW (Disable Wiper) bit (bit 6) electrically isolates the wiper terminal (VW/RW) when set to 1, preventing current flow and eliminating loading effects. Both bits are written directly to the WCR and affect real-time analog behavior; they are retained only in volatile memory and must be reconfigured after each power-up unless restored from DR0.

Is the X9241AMS RoHS-compliant and compatible with lead-free reflow soldering?

Yes, the X9241AMS is RoHS-compliant and features 100% matte tin (e3) termination finish qualified for Pb-free reflow soldering per IPC/JEDEC J-STD-020. Its MSL rating meets or exceeds Pb-free peak reflow requirements. The SOIC package is explicitly listed in the Ordering Information as RoHS-compliant, and the datasheet confirms compatibility with standard lead-free thermal profiles-no special handling or wave-solder-only restrictions apply to this variant.