Renesas X9279TV14I

Overview

X9279TV14I from Intersil is a single-channel, 256-tap, digitally controlled potentiometer (XDCP™) with 2-wire serial interface, 100kΩ end-to-end resistance, -40°C to +85°C industrial temperature range, and 14-lead TSSOP package. It functions as a programmable three-terminal potentiometer or two-terminal variable resistor for precision analog trimming in voltage-controlled circuits.

For engineers reviewing the X9279TV14I datasheet, X9279TV14I pinout, X9279TV14I application, or X9279TV14I equivalent, this device supports non-volatile wiper position storage, power-on recall from DR0, hardware write protection via WP pin, and fine-grained wiper adjustment via increment/decrement mode - all critical for embedded calibration and sensor signal conditioning designs.

Technical Context

The X9279TV14I implements a monolithic CMOS resistor ladder of 255 segments with CMOS-switched wiper selection controlled by an 8-bit volatile Wiper Counter Register (WCR). Its 2-wire bus interface uses open-drain SDA with pull-up requirement and supports read/write/transfer operations across four non-volatile data registers (DR0–DR3) in Bank 0.

Power-up behavior loads DR0 into the WCR; the WP pin disables non-volatile writes when held LOW. The device operates from 2.7V to 5.5V, draws <5µA standby current, and guarantees 100-year data retention and 100,000 write cycles per register bit - enabling long-life field calibration without battery backup.

Key Specifications

Pinout & Package

Package: 14-lead TSSOP (4.4mm width), RoHS-compliant, Pb-free (M14.173 drawing).

Key Features

Applications

Equivalent & Alternatives

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

Compared with X9279TV14I, both alternatives offer similar resolution and supply range but omit key reliability features: hardware write protection and automatic power-on recall from non-volatile memory - making X9279TV14I preferable for field-deployed systems requiring tamper-resistant calibration persistence.

Availability

X9279TV14I is available at Aetrix Electronics and suitable for industrial sensor conditioning, programmable power supplies, audio subsystems, and embedded calibration circuits requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for X9279TV14I 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 X9279TV14I belongs to Intersil's XDCP™ family of digitally controlled potentiometers, designed specifically for replacing mechanical trimmers in automated calibration, sensor signal conditioning, and programmable analog front-ends.

FAQ

What is the operating voltage range for the X9279TV14I?

The X9279TV14I operates from 2.7V to 5.5V, supporting both 3.3V and 5V system rails. This range is explicitly specified in the Ordering Information table and confirmed in the Absolute Maximum Ratings section. Operation outside this window may cause unreliable wiper positioning or communication failure. The X9279TV14I maintains full 256-tap resolution and guaranteed wiper resistance specs across the entire 2.7–5.5V span.

Does the X9279TV14I support automatic restoration of the wiper position after power cycling?

Yes, the X9279TV14I performs automatic power-on recall: at each power-up event, it loads the contents of Data Register 0 (DR0) into the volatile Wiper Counter Register (WCR). This behavior is hardwired and does not require firmware initialization. The X9279TV14I ensures repeatable analog state without host intervention - critical for fail-safe operation in unattended systems.

How many non-volatile data registers does the X9279TV14I have, and what are their functions?

The X9279TV14I contains four 8-bit non-volatile data registers (DR0–DR3) in Bank 0. Each stores one wiper position value (0–255) for recall or transfer to the WCR. DR0 serves as the default register loaded at power-up. All four registers support independent read/write/transfer operations via the 2-wire interface, enabling multi-point calibration storage within a single X9279TV14I device.

Can the X9279TV14I be used as a two-terminal variable resistor?

Yes, the X9279TV14I can operate as a two-terminal variable resistor by connecting either RH or RL to the wiper (RW) pin, leaving the unused terminal open. This configuration is explicitly supported in the Functional Diagram and Circuit Level Applications section. When used this way, the X9279TV14I provides digitally programmable resistance from near-0Ω to 100kΩ with 256 discrete steps - ideal for gain-setting and bias current control.

What is the purpose of the WP pin on the X9279TV14I?

The WP (Write Protect) pin on the X9279TV14I disables all non-volatile writes to the data registers when held LOW. This hardware-level protection prevents accidental overwriting of calibrated values during firmware updates or debug sessions. The X9279TV14I continues to support volatile WCR writes and reads regardless of WP state - allowing runtime adjustment while preserving stored calibration data.