Renesas X9429WV14

Overview

X9429WV14 from Intersil is a single-channel, 64-tap digitally controlled potentiometer (XDCP™) implemented in monolithic CMOS, operating from 2.7V to 5.5V with 10kΩ end-to-end resistance, 150Ω typical wiper resistance at 5V, and non-volatile storage of four wiper positions - used for precision gain/offset trimming in analog signal chains and voltage regulator feedback loops.

For engineers reviewing the X9429WV14 datasheet, X9429WV14 pinout, X9429WV14 application, or X9429WV14 equivalent, this page delivers verified technical context, validated pin functions, real-world use cases in sensor conditioning and power control, and two confirmed alternative parts with documented functional and packaging differences.

Technical Context

The X9429WV14 integrates a 63-element resistor array with CMOS switch-controlled wiper positioning, managed by a volatile 6-bit Wiper Counter Register (WCR) and four non-volatile 6-bit Data Registers (DR0–DR3). Power-up automatically loads DR0 into the WCR.

It uses a standard 2-wire (I²C-compatible) interface with slave address bits A0/A2/A3, hardware write-protect (WP), and supports read/write/transfer operations - including increment/decrement mode for fine-grained wiper adjustment synchronized to SCL edges.

Key Specifications

Pinout & Package

Package: 14-lead TSSOP (4.4mm width), 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 X9429WV14, AD5243BRMZ10 offers higher resolution and dual-channel capability but omits hardware write protection and automatic power-on recall, while MCP4018T-103E/OT reduces footprint and cost at the expense of non-volatile storage - making X9429WV14 optimal for field-calibrated, maintenance-free analog systems.

Availability

X9429WV14 is available at Aetrix Electronics and suitable for industrial power supplies, sensor signal conditioners, audio subsystems, and RF bias networks requiring stable component supply with guaranteed long-term calibration integrity.

Supply support for X9429WV14 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, acquired by Renesas Electronics in 2017; its products serve industrial, infrastructure, and high-end consumer markets.

The X9429 family was designed for digitally programmable analog trimming in systems requiring calibration persistence, low power, and I²C-compatible control - targeting applications where mechanical potentiometers fail due to wear or environmental stress.

FAQ

What is the function of the WP pin on the X9429WV14?

The WP (Write Protect) pin on the X9429WV14 is an active-low hardware input that disables all non-volatile writes to the four Data Registers when pulled low. This prevents accidental or unintended overwriting of stored calibration values during normal operation or firmware updates. The X9429WV14 retains full volatile wiper control (via WCR) even when WP is asserted, allowing runtime adjustment without risking stored settings.

Does the X9429WV14 require external pull-up resistors on the SDA and SCL lines?

Yes, the X9429WV14 requires external pull-up resistors on both SDA and SCL lines because its SDA pin is open-drain and SCL is input-only. Per the datasheet, typical values range from 1.8kΩ to 10kΩ depending on bus capacitance and target I²C speed (up to 400kHz). The exact value must be calculated using the bus pull-up resistor guidelines in FN8248 Rev 4.00, Page 11, to ensure valid logic levels and timing compliance.

How does the X9429WV14 handle power-up initialization?

On power-up, the X9429WV14 automatically loads the contents of Data Register 0 (DR0) into the volatile Wiper Counter Register (WCR), establishing a known default wiper position without host intervention. This power-on recall behavior is hardwired and occurs regardless of prior WCR state or DR0 modification history. The X9429WV14 does not perform any internal calibration or self-test during this sequence.

Can the X9429WV14 be used as a two-terminal variable resistor?

Yes, the X9429WV14 can be configured as a two-terminal variable resistor by connecting either RH/VH or RL/VL to the wiper RW/VW, leaving the unused terminal open or grounded. In this mode, resistance varies from near-zero (wiper at connected terminal) to full 10kΩ (wiper at opposite terminal). The 150Ω typical wiper resistance directly adds to the minimum achievable resistance, which must be accounted for in low-resistance applications.

What is the maximum clock frequency supported by the X9429WV14's 2-wire interface?

The X9429WV14 supports a maximum SCL clock frequency of 400kHz, compliant with standard-mode I²C specifications. This allows transfer of wiper position updates, register reads/writes, and increment/decrement commands within tight timing windows - for example, completing a non-volatile write to a Data Register in ≤10ms, or updating the wiper position in ≤10µs after instruction issuance.