Renesas X9429WV14I

Overview

X9429WV14I 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.

For engineers reviewing the X9429WV14I datasheet, X9429WV14I pinout, X9429WV14I application, or X9429WV14I equivalent, this device supports 2-wire (I²C-compatible) interface with hardware write protection, power-on recall from DR0, <3µA standby current, and operation across –40°C to +85°C in 14-lead TSSOP packaging.

Technical Context

The X9429WV14I integrates a 63-segment resistor array with CMOS switch-controlled wiper positioning governed by a volatile 6-bit Wiper Counter Register (WCR), which loads its value from non-volatile Data Register 0 (DR0) at power-up. The WCR supports direct write, register transfer, and real-time increment/decrement via SCL edge-triggered commands.

Its 2-wire interface implements I²C-style start/stop, acknowledge polling, and slave addressing using A0/A2/A3 pins to configure one of eight possible addresses. Hardware write protection (WP) disables non-volatile writes when asserted low, and all non-volatile register operations require high-voltage timing (5–10ms tWR).

Key Specifications

Pinout & Package

Package: 14-lead TSSOP (4.4mm width), 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 AD5171BRMZ-10 and MCP4017T-103E/OT, the X9429WV14I uniquely provides four non-volatile registers plus hardware write protection - enabling robust multi-point calibration, field reconfiguration, and fail-safe parameter locking in industrial and automotive systems.

Availability

X9429WV14I is available at Aetrix Electronics and suitable for precision analog trimming, sensor calibration, and programmable power supply applications requiring stable component supply, long-term data retention, and industrial temperature operation.

Supply support for X9429WV14I 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-reliability embedded markets.

The X9429 series was designed as a drop-in replacement for mechanical potentiometers in analog front-ends, emphasizing low noise, guaranteed monotonicity, and non-volatile configurability for factory and field calibration.

FAQ

What is the function of the WP pin on the X9429WV14I?

The WP (Write Protect) pin on the X9429WV14I is an active-low hardware input that disables all non-volatile writes to the four Data Registers (DR0–DR3) when pulled low. This prevents accidental overwriting of calibrated values during firmware updates or debug sessions. When WP is high, non-volatile writes proceed normally upon receipt of valid store instructions. The X9429WV14I's WP functionality operates independently of software commands, offering deterministic protection not achievable through register-level locks alone.

Does the X9429WV14I support true I²C communication?

Yes, the X9429WV14I supports standard I²C protocol including start/stop conditions, 7-bit slave addressing (with A0/A2/A3 defining LSBs), and acknowledge (ACK) signaling - compatible with standard I²C masters. It does not support clock stretching or 10-bit addressing, and its SDA is strictly open-drain requiring external pull-up. All timing parameters (tHIGH, tLOW, tSU:STA, etc.) comply with I²C Fast Mode (400kHz) specifications, making the X9429WV14I interoperable with common microcontroller I²C peripherals without protocol translation.

How does power-on recall work in the X9429WV14I?

At power-up, the X9429WV14I automatically loads the contents of Data Register 0 (DR0) into the volatile Wiper Counter Register (WCR), establishing the initial wiper position. This occurs regardless of the prior WCR state or DR1–DR3 contents. DR0 must be pre-programmed during manufacturing or commissioning to ensure deterministic startup behavior. The X9429WV14I performs this recall unconditionally - no command or initialization sequence is required - ensuring repeatable analog output immediately after VCC stabilization.

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

Yes, the X9429WV14I can be configured as a two-terminal variable resistor by connecting either RH/VH or RL/VL to the wiper terminal (RW/VW), leaving the other fixed terminal unused or grounded. In this mode, resistance varies from near-zero (wiper at same terminal) to full 10kΩ (wiper at opposite terminal). The X9429WV14I maintains specified wiper resistance (150Ω typ. at 5V) and linearity in this configuration, and all non-volatile register functions remain fully operational for storing and recalling resistance values.

What is the maximum clock frequency supported by the X9429WV14I's 2-wire interface?

The X9429WV14I supports a maximum SCL clock frequency of 400kHz, compliant with I²C Fast Mode. This allows read/write operations to complete in under 100µs per byte, and non-volatile register transfers (e.g., DR→WCR) to initiate within one instruction cycle. The X9429WV14I's timing budget accommodates standard microcontroller I²C peripherals without requiring custom bit-banging; setup/hold times (tSU:DAT = 100ns, tHD:DAT = 30ns) are easily met using typical GPIO toggle rates.