Renesas X9429WV14I-2.7

Overview

X9429WV14I-2.7 from Intersil is a single-channel, 64-tap digitally controlled potentiometer (XDCP™) with 2-wire I²C-compatible interface, 10 kΩ end-to-end resistance, ±20% tolerance, and operation from 2.7 V to 5.5 V. It functions as a programmable three-terminal potentiometer or two-terminal variable resistor for precision analog trimming in voltage regulators, amplifier gain control, and sensor signal conditioning circuits.

For engineers reviewing the X9429WV14I-2.7 datasheet, X9429WV14I-2.7 pinout, X9429WV14I-2.7 application, or X9429WV14I-2.7 equivalent, this device delivers low-noise, low-power digital potentiometry with non-volatile storage of four wiper positions, power-on recall from DR0, and <3 µA standby current - critical for battery-powered and industrial embedded systems requiring stable, repeatable analog adjustments.

Technical Context

The X9429WV14I-2.7 implements a monolithic CMOS resistor ladder with 63 discrete segments and 64 tap points, decoded via a volatile 6-bit Wiper Counter Register (WCR). Wiper position is controlled through I²C commands including direct write, register transfer (DR→WCR or WCR→DR), and real-time increment/decrement synchronized to SCL edges.

It integrates four non-volatile 6-bit Data Registers (DR0–DR3) with 100,000-cycle endurance and 100-year data retention. Power-up automatically loads DR0 into the WCR. Hardware write protection (WP pin) disables non-volatile writes, and device addressing uses A0/A2/A3 pins to support up to eight devices on one bus.

Key Specifications

Pinout & Package

Package: 14-lead TSSOP (4.4 mm wide), RoHS-compliant, moisture sensitivity level (MSL) per JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5170BRMZ-10 and MCP4017T-103E/OT, the X9429WV14I-2.7 uniquely combines quad non-volatile register storage, hardware write protection, and guaranteed power-on recall - making it optimal for unattended, field-calibratable systems where configuration persistence and robustness are mandatory.

Availability

X9429WV14I-2.7 is available at Aetrix Electronics and suitable for industrial sensor calibration, battery-powered instrumentation, and programmable power supply design requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for X9429WV14I-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 is a pioneer in precision analog and power management ICs, now part of Renesas Electronics, delivering high-reliability solutions for industrial, automotive, and communications infrastructure markets.

The X9429 family was designed specifically for replacing mechanical potentiometers in analog signal conditioning, offering digital programmability, non-volatile calibration storage, and robust I²C interface for embedded control systems.

FAQ

What is the minimum supply voltage required for reliable operation of the X9429WV14I-2.7?

The X9429WV14I-2.7 operates reliably from 2.7 V to 5.5 V. At 2.7 V, wiper resistance rises to 400–1000 Ω (vs. 150 Ω typical at 5 V), and SDA/SCL logic thresholds scale accordingly (VIH = 0.7 × VCC). All specifications - including 400 kHz I²C timing and 64-tap linearity - are validated across this full range, making X9429WV14I-2.7 suitable for single-cell battery systems.

How does the power-on recall function work in the X9429WV14I-2.7?

On power-up, the X9429WV14I-2.7 automatically loads the contents of Data Register 0 (DR0) into the volatile Wiper Counter Register (WCR), positioning the wiper without host interaction. This behavior is hardwired and occurs regardless of WP pin state or prior WCR value. DR0 must be pre-programmed during manufacturing or field calibration to ensure correct startup behavior for X9429WV14I-2.7.

Can the X9429WV14I-2.7 be used as a two-terminal variable resistor?

Yes - the X9429WV14I-2.7 supports two-terminal operation by connecting either RH/VH or RL/VL to the wiper RW/VW, leaving the unused terminal open. In this mode, resistance varies from ~0 Ω (wiper at shorted terminal) to full 10 kΩ (wiper at opposite end), with wiper resistance contributing series error. Datasheet Figure 16 confirms this configuration for variable current applications.

What is the purpose of the WP pin on the X9429WV14I-2.7?

The WP (Write Protect) pin on the X9429WV14I-2.7 is a hardware-enabled safeguard: when pulled LOW, it blocks all non-volatile writes to the four Data Registers (DR0–DR3), preventing accidental overwrites during firmware updates or electrical noise events. Volatile WCR writes and reads remain fully functional. This feature enhances field reliability for X9429WV14I-2.7 in mission-critical calibration systems.

How many devices can share the same I²C bus with the X9429WV14I-2.7?

Up to eight X9429WV14I-2.7 devices can coexist on a single I²C bus using the A0, A2, and A3 address pins. These three inputs configure bits 0, 2, and 3 of the 7-bit slave address (fixed prefix 0101), yielding eight unique addresses (e.g., 0x54–0x5B). A1 is not implemented - only A0, A2, A3 are used for addressing X9429WV14I-2.7 devices.