Renesas X9429WV14IT1

Overview

X9429WV14IT1 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 for use as a programmable voltage divider or two-terminal variable resistor in precision analog trimming applications.

For engineers reviewing the X9429WV14IT1 datasheet, X9429WV14IT1 pinout, X9429WV14IT1 application, or X9429WV14IT1 equivalent, key selection criteria include its 2-wire (I²C-compatible) interface, power-on recall from DR0, <3µA standby current, 14-lead TSSOP package, and support for fine-grained wiper adjustment via increment/decrement command.

Technical Context

The X9429WV14IT1 integrates a 63-resistor-segment array with CMOS switches controlled by a volatile 6-bit Wiper Counter Register (WCR), enabling precise tap selection across 64 discrete positions. Its operation relies on bidirectional 2-wire serial communication with slave address decoding using A0, A2, and A3 pins.

Four non-volatile 6-bit Data Registers (DR0–DR3) allow persistent storage of wiper settings; DR0 loads automatically into the WCR at power-up. Hardware write protection is provided via the WP pin, and wiper movement can be executed via direct register write, register transfer, or real-time SCL-synchronized increment/decrement.

Key Specifications

Pinout & Package

Package: 14-lead TSSOP (4.4mm width), RoHS-compliant, moisture sensitivity level (MSL) rated 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 X9429WV14IT1, AD5170BRMZ-10 offers finer resolution and better temperature stability but omits hardware write protection, while MCP4017T-103I/OT reduces cost and complexity at the expense of non-volatile storage and autonomous power-up behavior.

Availability

X9429WV14IT1 is available at Aetrix Electronics and suitable for precision analog trimming, sensor calibration, and programmable power supply applications requiring stable component supply, long-term calibration retention, and industrial temperature operation.

Supply support for X9429WV14IT1 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 expertise in high-reliability industrial and infrastructure solutions.

The X9429 product line delivers digitally programmable resistive elements for replacing mechanical potentiometers in calibration-critical systems where long-term stability, low noise, and non-volatile configuration storage are essential.

FAQ

What is the function of the WP pin on the X9429WV14IT1?

The WP (Write Protect) pin on the X9429WV14IT1 is a hardware-controlled input that, when held low, disables all non-volatile writes to the four Data Registers (DR0–DR3). This prevents accidental overwriting of calibrated wiper positions during normal operation or firmware updates. The X9429WV14IT1 retains full volatile operation-including wiper position changes via the Wiper Counter Register-regardless of WP state.

Does the X9429WV14IT1 support true I²C communication?

Yes, the X9429WV14IT1 implements a fully compliant 2-wire serial interface compatible with standard I²C protocols, including start/stop conditions, 7-bit slave addressing (with 3-bit user-configurable address via A0/A2/A3), and acknowledge handshaking. It operates at up to 400kHz clock frequency and uses open-drain SDA with external pull-up, matching I²C electrical and timing requirements as defined in the FN8248 datasheet.

How does power-on recall work in the X9429WV14IT1?

At power-up, the X9429WV14IT1 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 regardless of WP state or prior volatile register contents. DR0 must be pre-programmed during manufacturing or commissioning to ensure correct startup behavior for the X9429WV14IT1.

What is the maximum wiper current rating for the X9429WV14IT1?

The X9429WV14IT1 specifies a maximum wiper current (IW) of ±3mA under all operating conditions. Exceeding this limit risks irreversible damage to the internal CMOS switches or resistor segments. For safe operation as a two-terminal variable resistor, total current through RH–RL must remain ≤3mA; as a three-terminal potentiometer, current through RW must stay within ±3mA, consistent with the 50mW total power rating per pot.

Can the X9429WV14IT1 be used in a 3.3V system?

Yes, the X9429WV14IT1 is fully specified for operation from 2.7V to 5.5V, making it compatible with 3.3V systems. At 3.3V, wiper resistance increases to 400–1000Ω (vs. 150Ω typical at 5V), and logic thresholds scale accordingly (VIH = 0.7×VCC, VIL = 0.1×VCC). All AC timing parameters-including 400kHz SCL support-and analog performance (e.g., noise, linearity) remain valid across the full supply range for the X9429WV14IT1.