Renesas X9418WP24-2.7

Overview

X9418WP24-2.7 from Intersil is a dual digitally controlled potentiometer (XDCP™) with 2-wire I²C-compatible interface, 64-tap resolution per pot, 10kΩ end-to-end resistance, ±2.7V to ±5.5V analog supply range (V+/V−), and 2.7V–5.5V digital supply (VCC). It operates across –40°C to +85°C in a 24-pin PDIP package and is used for precision offset adjustment in industrial sensor signal conditioning.

For engineers reviewing the X9418WP24-2.7 datasheet, X9418WP24-2.7 pinout, X9418WP24-2.7 application, or X9418WP24-2.7 equivalent, key selection criteria include dual-potentiometer integration, nonvolatile wiper position storage (DR0 auto-load at power-up), hardware write protection (WP pin), low standby current (<1µA), and compatibility with battery-powered or wide-voltage analog systems requiring ratiometric stability.

Technical Context

The X9418WP24-2.7 implements two independent 63-segment resistor arrays with CMOS-switched wipers controlled by 6-bit volatile Wiper Counter Registers (WCRs). Each potentiometer features four 6-bit nonvolatile Data Registers (DR0–DR3) supporting direct read/write, transfer to/from WCR, and global register operations via I²C.

Its 2-wire serial interface supports standard-mode (400kHz max) timing, device addressing via A0–A3 (16-device bus capacity), and hardware write protection via active-low WP pin. Power-up behavior loads DR0 into both WCRs, ensuring deterministic initial wiper positions without host intervention.

Key Specifications

Pinout & Package

Package: 24-pin plastic DIP (dual in-line package), 0.600" width, JEDEC MS-001 compliant, lead spacing 0.100", RoHS-compliant (Pb-free plus anneal).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5242BRUZ10 and MCP41HV51-103, the X9418WP24-2.7 uniquely combines dual-pot integration, bipolar V+/V− operation, nonvolatile DR0 auto-load, and hardware write protection-making it optimal for industrial sensor signal chains requiring robust, self-initializing analog trimming.

Availability

X9418WP24-2.7 is available at Aetrix Electronics and suitable for industrial sensor calibration, programmable power supplies, and test equipment requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for X9418WP24-2.7 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, aerospace, and communications markets.

The X9418 family delivers digitally controlled potentiometers optimized for precision analog trimming in harsh environments-emphasizing nonvolatile storage, wide supply tolerance, and hardware-level write protection.

FAQ

What is the power-up behavior of the X9418WP24-2.7?

At power-up, the X9418WP24-2.7 automatically loads the contents of Data Register 0 (DR0) into both Wiper Counter Registers (WCRs), establishing deterministic initial wiper positions without host intervention. This requires proper sequencing: VCC must stabilize first, followed by V+ and V−, then potentiometer pins (VH/VL/VW). The X9418WP24-2.7 will not complete recall until all three supplies reach final value.

Does the X9418WP24-2.7 support true bipolar analog operation?

Yes, the X9418WP24-2.7 supports true bipolar analog operation via dedicated V+ and V− pins rated from ±2.7V to ±5.5V. This allows the resistor arrays to function across negative and positive voltages-enabling use in AC-coupled signal paths, dual-supply op-amps, and comparator hysteresis circuits where mechanical potentiometers would require external level-shifting.

How does the hardware write protect (WP) pin function on the X9418WP24-2.7?

The WP pin on the X9418WP24-2.7 is an active-low input that disables all nonvolatile writes to the Data Registers (DR0–DR3) when asserted. When WP = LOW, commands like "Write Data Register" or "XFR WCR to DR" are ignored-even if valid I²C traffic is received. This provides fail-safe protection against accidental calibration overwrite during field updates or firmware glitches.

What is the maximum I²C clock frequency supported by the X9418WP24-2.7?

The X9418WP24-2.7 supports standard-mode I²C operation up to 400kHz, with guaranteed timing parameters including tCYC ≥ 2500ns, tHIGH ≥ 600ns, and tLOW ≥ 1300ns. It uses open-drain SCL/SDA pins requiring external pull-up resistors; recommended values depend on bus capacitance but typically range from 1.8kΩ (100pF) to 4.7kΩ (20pF) for reliable 400kHz operation.

Can the X9418WP24-2.7 be used as a two-terminal variable resistor?

Yes, the X9418WP24-2.7 can be configured as a two-terminal variable resistor by connecting either VH/RH or VL/RL to the wiper VW/RW, leaving the unused terminal open or tied to a fixed potential. This configuration is commonly used in current-setting applications (e.g., LED driver bias) and programmable current sources-leveraging the same 64-tap resolution and nonvolatile storage as the three-terminal potentiometer mode.