Renesas X9279TV14Z

Overview

X9279TV14Z from Intersil is a single-supply, low-power, 256-tap digitally controlled potentiometer (XDCP™) with 2-wire serial interface, 100 kΩ end-to-end resistance, and 14-lead TSSOP package. It functions as a volatile wiper-controlled resistor array with non-volatile data registers, enabling programmable gain control in voltage amplifiers and DC bias adjustment in sensor signal conditioning circuits.

For engineers reviewing the X9279TV14Z datasheet, X9279TV14Z pinout, X9279TV14Z application, or X9279TV14Z equivalent, this device supports precise digital trimming of analog signals in industrial sensor interfaces, audio volume control, and LCD contrast adjustment-requiring confirmation of VCC range (2.7V–5.5V), wiper resistance (≤150 Ω @ 5V), and hardware write-protect (WP) functionality.

Technical Context

The X9279TV14Z implements a monolithic CMOS 255-segment resistor ladder with CMOS-switched wiper access controlled by an 8-bit volatile Wiper Counter Register (WCR). Its 2-wire bus interface uses open-drain SDA and edge-triggered SCL to support read/write/transfer operations across four non-volatile data registers (DR0–DR3) and power-up recall from DR0.

It operates within 0°C to +70°C, supports hardware write protection via active-low WP pin, and delivers ≤5 µA standby current. The device integrates power-on initialization logic that loads DR0 into WCR, ensuring repeatable startup wiper position without host intervention.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL95810 and AD5170BRMZ-100, the X9279TV14Z uniquely combines hardware write protection, automatic power-on DR0 recall, and sub-150 Ω wiper resistance - making it optimal for industrial calibration-critical systems requiring deterministic startup behavior and robust field update security.

Availability

X9279TV14Z is available at Aetrix Electronics and suitable for industrial sensor interfaces, LCD display modules, and programmable power supply designs requiring stable component supply and long-lifecycle support.

Supply support for X9279TV14Z 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 X9279TV14Z belongs to Intersil's XDCP™ family of digitally controlled potentiometers, designed specifically for replacing mechanical trimmers in calibration-sensitive analog signal paths while maintaining RoHS compliance and extended temperature operation.

FAQ

What is the guaranteed VCC operating range for the X9279TV14Z?

The X9279TV14Z is specified for 2.7 V to 5.5 V operation, as confirmed in the Ordering Information table and Absolute Maximum Ratings section of the datasheet. This range supports both 3.3 V and 5 V system rails without level-shifting. Operation below 2.7 V may result in undefined wiper position retention or interface failure, and is not characterized.

Does the X9279TV14Z support true power-on wiper recall, and how is it implemented?

Yes, the X9279TV14Z supports true power-on wiper recall: at power-up, the contents of Data Register 0 (DR0) are automatically loaded into the volatile Wiper Counter Register (WCR). This behavior is hardwired and requires no host command. The X9279TV14Z achieves deterministic startup by executing this load after VCC stabilizes, ensuring repeatable analog output without firmware intervention.

How does the hardware write-protect (WP) pin function on the X9279TV14Z?

The WP pin on the X9279TV14Z is an active-low input that disables all non-volatile writes to the four data registers (DR0–DR3) when held LOW. When WP is HIGH or floating (with pull-up), writes are permitted. This feature prevents accidental overwriting of factory-calibrated values during system operation - a key reliability mechanism absent in many competing DCPs.

What is the maximum wiper current rating for the X9279TV14Z, and why does it matter?

The X9279TV14Z specifies a maximum wiper current (IW) of ±3 mA. Exceeding this limit risks permanent damage to the internal CMOS switches controlling wiper position. This rating directly constrains usable voltage drop across the potentiometer: for a 100 kΩ device, applying >300 mV across RH–RL exceeds safe wiper current. Designers must verify current paths in feedback or bias networks.

Can the X9279TV14Z be used in industrial temperature environments, and what version supports that?

The X9279TV14Z is rated for 0°C to +70°C (Commercial grade). For industrial temperature operation (–40°C to +85°C), the correct variant is X9279TV14I or X9279TV14IZ (Pb-free). The "I" suffix denotes the extended temperature range; the "Z" suffix indicates RoHS-compliant packaging. Using X9279TV14Z outside its specified range may cause parametric shift or functional failure.