Renesas X9418WS24I-2.7T1

Overview

X9418WS24I-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 10kΩ 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 industrial control loops.

For engineers reviewing the X9418WS24I-2.7T1 datasheet, X9418WS24I-2.7T1 pinout, X9418WS24I-2.7T1 application, or X9418WS24I-2.7T1 equivalent, key selection criteria include its dual-pot architecture, 2.7V–5.5V VCC compatibility, -40°C to +85°C industrial temperature rating, SOIC-24 package, and hardware write-protect (WP) functionality for EEPROM register safety.

Technical Context

The X9418WS24I-2.7T1 implements two 63-segment resistor arrays with CMOS switch-based wiper control, each driven by a 6-bit volatile Wiper Counter Register (WCR) and backed by four 6-bit nonvolatile Data Registers (DR0–DR3). Power-up automatically loads DR0 into the WCR for deterministic startup behavior.

Its I²C-compatible 2-wire interface supports slave addressing via A0–A3 pins (up to 16 devices on bus), ACK polling during nonvolatile writes, and real-time wiper increment/decrement via SCL-triggered edge detection on SDA - enabling fine-grained analog tuning without host CPU intervention.

Key Specifications

Pinout & Package

Package: 24-pin SOIC (300-mil 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 X9418WS24I-2.7T1 uniquely delivers dual-pot functionality with true bipolar analog operation (±2.7V to ±5.5V) and hardware write protection - making it optimal for industrial calibration and precision AC signal conditioning where isolation, rail-to-rail swing, and EEPROM safety are mandatory.

Availability

X9418WS24I-2.7T1 is available at Aetrix Electronics and suitable for industrial sensor calibration, programmable power supply trim, and audio signal level control requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for X9418WS24I-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, aerospace, and communications markets.

The X9418 family was designed specifically for digitally programmable analog trimming in harsh environments - emphasizing nonvolatile storage, bipolar operation, and robust I²C communication for factory and field calibration.

FAQ

What is the absolute maximum voltage rating on the VH0/RH0 pin of the X9418WS24I-2.7T1?

The absolute maximum voltage on any VH/RH, VL/RL, or VW/RW pin is specified as V− to V+. For the X9418WS24I-2.7T1, V− ranges from −5.5V to −2.7V and V+ from +2.7V to +5.5V, so the pin can withstand up to ±5.5V differential. Exceeding these limits risks permanent damage per Absolute Maximum Ratings table on page 11 of FN8194 Rev 2.00.

Does the X9418WS24I-2.7T1 support true I²C bus arbitration or multi-master operation?

No, the X9418WS24I-2.7T1 operates strictly as a slave device and does not implement I²C bus arbitration logic. It responds only to START/STOP conditions and slave address matches, with no capability to detect or resolve bus contention. Multi-master configurations require external arbitration or strict master scheduling to avoid collisions.

How long does it take for the wiper position to update after issuing a Write Wiper Counter Register command to the X9418WS24I-2.7T1?

After issuing a Write Wiper Counter Register command, the wiper position updates within tWRL = 10µs (typical) as specified in the XDCP Timing section (page 14). This delay occurs after the third power supply (VCC, V+, or V−) reaches stability and applies to all load instructions including direct WCR writes and register transfers.

Can the X9418WS24I-2.7T1 be used with a 1.8V I²C bus?

No - the X9418WS24I-2.7T1 requires VCC ≥ 2.7V and specifies VIH = VCC × 0.7 (min), meaning at 2.7V VCC, VIH(min) = 1.89V. A 1.8V logic high fails to meet this threshold and will not reliably register as a HIGH input. Use only with 2.7V–5.5V I²C masters.

Is the WP pin on the X9418WS24I-2.7T1 active-high or active-low?

The WP pin on the X9418WS24I-2.7T1 is active-low: when WP is driven LOW, nonvolatile writes to the Data Registers (DR0–DR3) are disabled. When WP is HIGH or floating (with pull-up), writes are enabled. This behavior is confirmed in the Pin Descriptions section (page 2) and Figure 5 timing diagram (page 6) of FN8194 Rev 2.00.