Renesas X9429WV14IZ

Overview

X9429WV14IZ from Intersil is a single-channel, 64-tap digitally controlled potentiometer (XDCP™) with 2-wire serial interface, 10 kΩ end-to-end resistance, ±20% tolerance, and operation from 2.7 V to 5.5 V. It integrates volatile wiper counter register (WCR) and four non-volatile data registers (DR0–DR3), enabling programmable resistor adjustment in analog signal conditioning circuits.

For engineers reviewing the X9429WV14IZ datasheet, X9429WV14IZ pinout, X9429WV14IZ application, or X9429WV14IZ equivalent, key selection criteria include its -40°C to +85°C industrial temperature range, 14-lead TSSOP package, 150 Ω typical wiper resistance at 5 V, <3 µA standby current, and power-on recall of DR0 to WCR - all critical for precision trimming in embedded sensor interfaces and regulated power supplies.

Technical Context

The X9429WV14IZ implements a monolithic CMOS resistor ladder with 63 discrete segments and 64 tap points, decoded via a 6-bit WCR to select one wiper switch. Its 2-wire bus (SCL/SDA) supports read/write/transfer operations including direct WCR access, DR ↔ WCR transfers, and real-time increment/decrement control synchronized to SCL edges.

Non-volatile storage uses EEPROM technology with 100,000 write cycles per bit and 100-year data retention. Hardware write protection (WP pin) disables nonvolatile writes, while address pins A0/A2/A3 enable up to eight devices on a shared bus. Power-up automatically loads DR0 into WCR, ensuring deterministic startup behavior without host initialization.

Key Specifications

Pinout & Package

Package: 14-lead TSSOP (4.4 mm wide), RoHS-compliant, thermal resistance θ_JA = 92°C/W.

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-103I/P, the X9429WV14IZ uniquely combines I²C compatibility, hardware write protection, non-volatile multi-register storage, and industrial temperature rating - making it optimal for self-contained, recalibration-free analog trimming in harsh environments.

Availability

X9429WV14IZ is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, programmable power supply regulation, and embedded audio control requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for X9429WV14IZ 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 provider of precision analog and power management ICs, now part of Renesas Electronics, with focus on industrial, infrastructure, and high-reliability applications.

The X9429 product line delivers digitally programmable resistance for analog trimming and calibration tasks, designed specifically for systems requiring non-volatile setting retention, low power, and robust serial control in space-constrained industrial designs.

FAQ

What is the operating temperature range of the X9429WV14IZ?

The X9429WV14IZ is rated for industrial operation from -40°C to +85°C, as confirmed by its ordering suffix "I" and datasheet specification. This range ensures reliable performance in embedded controllers, motor drives, and outdoor sensor nodes where ambient temperatures exceed commercial limits. The device maintains specified linearity, resistance tolerance, and timing parameters across this full range.

Does the X9429WV14IZ require external pull-up resistors on the SDA and SCL lines?

Yes, the X9429WV14IZ requires external pull-up resistors on both SDA and SCL lines because its SDA pin is open-drain and SCL is a CMOS input. Typical values range from 1.8 kΩ to 10 kΩ depending on bus capacitance and speed; the datasheet provides guidelines based on 400 kHz operation and measured input capacitance of 8 pF on SDA and 6 pF on SCL.

How does the power-on recall function work in the X9429WV14IZ?

On power-up, the X9429WV14IZ automatically loads the contents of Data Register 0 (DR0) into the volatile Wiper Counter Register (WCR), establishing the initial wiper position without host intervention. This behavior is hardwired and occurs each time VCC rises above the reset threshold, ensuring repeatable startup conditions in systems where firmware may not initialize the device immediately.

Can the X9429WV14IZ be used as a two-terminal variable resistor?

Yes, the X9429WV14IZ supports two-terminal operation by connecting either RH/VH or RL/VL to VW/RW, effectively using only part of the resistor ladder. In this configuration, it functions as a digitally adjustable current-limiting or gain-setting element, with resistance varying from near-zero (wiper at terminal) to full 10 kΩ (wiper at opposite end), subject to wiper resistance and linearity specifications.

What is the maximum write endurance of the non-volatile registers in the X9429WV14IZ?

The non-volatile data registers in the X9429WV14IZ support a minimum of 100,000 data changes per bit per register, as specified in the datasheet's Endurance section. This endurance rating applies to all four DRs (DR0–DR3) and covers both direct writes and transfer operations from WCR; each register retains data for up to 100 years under normal storage conditions.