Renesas X9418WV24-2.7T1

Overview

X9418WV24-2.7T1 from Intersil is a dual digitally controlled potentiometer (XDCP™) with 2-wire serial interface, 64-tap resolution per pot, ±2.7V to ±5.5V analog supply range, and 10 kΩ end-to-end resistance. It integrates two independent resistor arrays, each with volatile wiper counter registers and four nonvolatile data registers, enabling precise digital adjustment in battery-powered instrumentation and precision analog signal conditioning.

For engineers reviewing the X9418WV24-2.7T1 datasheet, X9418WV24-2.7T1 pinout, X9418WV24-2.7T1 application, or X9418WV24-2.7T1 equivalent, key selection criteria include its dual-pot architecture, 2.7–5.5 V VCC compatibility, hardware write-protect (WP) functionality, 100-year nonvolatile data retention, and TSSOP-24 package with verified 4.4 mm body width.

Technical Context

The X9418WV24-2.7T1 implements two independent 63-segment resistor arrays, each controlled by a 6-bit wiper counter register (WCR) decoded to select one of 64 tap points. Each potentiometer supports direct WCR read/write, transfer between WCR and four nonvolatile data registers (DR0–DR3), and real-time increment/decrement via SCL-triggered edge detection on SDA.

It operates as a slave on a standard 2-wire (I²C-compatible) bus with programmable 4-bit device address (A0–A3), acknowledges after start + address match, and uses open-drain SDA with external pull-up. Hardware write protection (WP) disables nonvolatile writes when low, and power-up automatically loads DR0 into both WCRs.

Key Specifications

Pinout & Package

Package: 24-lead TSSOP (4.4 mm body width), RoHS-compliant, Pb-free plus anneal finish (MDP0044 drawing).

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 X9418WV24-2.7T1 uniquely delivers dual-pot functionality with true bipolar analog operation in a compact TSSOP-24 package, making it the only option among the three suitable for precision DC-coupled, dual-rail analog control without external support circuitry.

Availability

X9418WV24-2.7T1 is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial sensor interfaces, and audio signal conditioning requiring stable component supply with long-term calibration integrity and RoHS-compliant packaging.

Supply support for X9418WV24-2.7T1 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 (now part of Renesas Electronics) is a semiconductor company specializing in precision analog, power management, and interface ICs for industrial, communications, and computing markets.

The X9418 product line was designed for digitally programmable analog signal conditioning-specifically targeting applications needing nonvolatile, dual-channel, bipolar potentiometer functions in space-constrained, low-power systems.

FAQ

What is the recommended power-up sequence for reliable wiper register recall in the X9418WV24-2.7T1?

The X9418WV24-2.7T1 requires strict power sequencing: VCC must stabilize first, followed by V+ and V−, and finally the potentiometer terminal pins (VH/VL/VW). Violating this order-especially applying voltage to VH/VL before V+ or V−-can cause incorrect wiper initialization. Power-down must hold VCC below 0.1 V for >1 second before restart to guarantee DR0 reload into both WCRs. This behavior is documented in the Power-Up Timing section of the FN8194 datasheet.

Does the X9418WV24-2.7T1 support true I²C bus communication, including ACK polling?

Yes, the X9418WV24-2.7T1 fully supports I²C protocol compliance: it responds with ACK after recognizing its 8-bit slave address (0101xxxx), acknowledges instruction bytes, and permits ACK polling during nonvolatile write cycles (tWR = 5–10 ms). The device asserts ACK only when ready-allowing hosts to detect completion without fixed delays. This is confirmed in Figures 1 and 3 and the ACK Polling Sequence flowchart on page 4 of FN8194 Rev 2.00.

Can the X9418WV24-2.7T1 be used as a two-terminal variable resistor, and what is the maximum allowable wiper current?

Yes, the X9418WV24-2.7T1 supports two-terminal operation by connecting either VH or VL to the wiper (VW), effectively creating a programmable rheostat. Per the Absolute Maximum Ratings table, the wiper current (IW) is limited to ±3 mA under all conditions. Exceeding this risks permanent damage to internal CMOS switches. The Analog Characteristics table further specifies wiper resistance as 150–250 Ω at ±3 V analog supplies, directly impacting power dissipation in rheostat mode.

How does hardware write protection (WP) function on the X9418WV24-2.7T1, and what happens when WP is asserted during a write command?

When the WP pin is driven LOW, the X9418WV24-2.7T1 blocks all nonvolatile writes to its eight Data Registers (DR0–DR3). If a write instruction (e.g., Write Data Register or XFR WCR→DR) is issued while WP is active, the command executes without error-but the target DR contents remain unchanged. Volatile operations (WCR reads/writes, increment/decrement) remain fully functional. This behavior is explicitly defined in the Pin Descriptions section on page 2 of FN8194 Rev 2.00.

What is the temperature coefficient of resistance for the X9418WV24-2.7T1, and how does it impact precision applications?

The X9418WV24-2.7T1 has a total resistance temperature coefficient of ±300 ppm/°C and a ratiometric coefficient of ±20 ppm/°C. The ratiometric spec ensures minimal relative drift between taps-critical for voltage divider accuracy-while the absolute coefficient affects end-to-end resistance stability. For example, over a 0°C to 70°C range, total resistance may shift by up to ±2.1%, but tap-to-tap ratios remain within ±0.14%. These values are measured and guaranteed per the Analog Characteristics table on page 11 of FN8194 Rev 2.00.