Renesas X9418WV24I-2.7T1

Overview

X9418WV24I-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 (V+/V−), 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 industrial control loops.

For engineers reviewing the X9418WV24I-2.7T1 datasheet, X9418WV24I-2.7T1 pinout, X9418WV24I-2.7T1 application, or X9418WV24I-2.7T1 equivalent, key selection criteria include its dual-pot architecture, -40°C to +85°C industrial temperature rating, TSSOP-24 package, hardware write-protect (WP) input, and support for 400 kHz I²C-compatible bus timing.

Technical Context

The X9418WV24I-2.7T1 implements two 63-segment resistor arrays with CMOS-switched wipers controlled by 6-bit wiper counter registers (WCR). Each potentiometer supports direct WCR read/write, transfer between WCR and four nonvolatile data registers (DR0–DR3), and real-time increment/decrement via SCL edge-triggered commands.

Its 2-wire interface complies with I²C timing (f_SCL ≤ 400 kHz), uses open-drain SDA with external pull-up, and supports up to 16 devices on one bus via A0–A3 address inputs. Power-up automatically loads DR0 into both WCRs, and WP pin disables nonvolatile writes when low.

Key Specifications

Pinout & Package

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

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 X9418WV24I-2.7T1 uniquely delivers dual-pot functionality with true bipolar analog supply support and hardware write protection - making it the only option among the three qualified for industrial-grade, field-calibratable, bipolar signal conditioning applications.

Availability

X9418WV24I-2.7T1 is available at Aetrix Electronics and suitable for industrial voltage regulation, instrumentation calibration, audio level control, and motor drive bias adjustment requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for X9418WV24I-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 Corporation (now part of Renesas Electronics) designs high-performance analog and mixed-signal ICs for power management, precision analog, and interface applications.

The X9418 family was engineered specifically for digitally programmable analog trimming in industrial and instrumentation systems where reliability, nonvolatile calibration storage, and bipolar signal handling are critical design requirements.

FAQ

What is the absolute maximum voltage rating on the VH0, VL0, and VW0 pins of the X9418WV24I-2.7T1?

The X9418WV24I-2.7T1 specifies that voltage on any VH/RH, VL/RL, or VW/RW pin must remain within the range V− to V+. For this part, V− is rated down to −5.5 V and V+ up to +5.5 V, so these analog pins tolerate −5.5 V to +5.5 V. Exceeding this range risks latch-up or permanent damage, as confirmed in the Absolute Maximum Ratings table on page 11 of FN8194 Rev 2.00.

Does the X9418WV24I-2.7T1 support true I²C communication, including ACK polling and repeated START conditions?

Yes, the X9418WV24I-2.7T1 fully supports I²C protocol features including START/STOP conditions, 7-bit slave addressing with A0–A3, ACK/NAK handshaking, and ACK polling during nonvolatile write cycles. Figure 1 on page 4 and the ACK Polling Sequence (Flow 1, page 4) explicitly confirm this behavior. The device responds with ACK after address match and instruction receipt, enabling robust multi-master bus arbitration.

How does power-up sequencing affect wiper register recall in the X9418WV24I-2.7T1?

Proper power-up sequencing is mandatory for reliable DR0-to-WCR recall in the X9418WV24I-2.7T1: VCC must be applied first, followed by V+ and V−, then analog pins (VH/VL/VW). Applying voltage to analog pins before V+ or V− may cause undefined wiper states. Additionally, VCC must ramp at 0.2–50 V/msec and remain below 0.1 V for >1 second after power-down to ensure clean register reload - details are specified in the Power-Up Timing section (page 12).

Can the X9418WV24I-2.7T1 be used as a two-terminal variable resistor, and what is its wiper resistance specification?

Yes, the X9418WV24I-2.7T1 can operate as a two-terminal variable resistor by connecting either VH/RH or VL/RL to VW/RW. Its wiper resistance is specified as 150–250 Ω at ±3 V analog supplies and 40–100 Ω at ±5 V (page 11, Analog Characteristics table). This low on-resistance ensures minimal insertion error in current-sense and gain-setting applications.

Is the X9418WV24I-2.7T1 recommended for new designs, and what is its lifecycle status?

No - the X9418WV24I-2.7T1 is marked "NOT RECOMMENDED FOR NEW DESIGNS" on page 1 of FN8194 Rev 2.00, with "NO RECOMMENDED REPLACEMENT" stated. While fully functional and supported for existing production, Intersil advises against new design-in. Aetrix Electronics maintains active inventory and supply continuity for legacy industrial programs relying on the X9418WV24I-2.7T1.