Renesas X9429WV14IZ-2.7T1

Overview

X9429WV14IZ-2.7T1 from Intersil is a single-channel, 64-tap digitally controlled potentiometer (XDCP™) with 2-wire I²C-compatible interface, 10 kΩ end-to-end resistance, ±20% tolerance, and operation from 2.7 V to 5.5 V. It implements a volatile wiper counter register (WCR) and four non-volatile data registers (DR0–DR3), enabling programmable gain control in audio amplifiers and DC bias trimming in voltage regulators.

For engineers reviewing the X9429WV14IZ-2.7T1 datasheet, X9429WV14IZ-2.7T1 pinout, X9429WV14IZ-2.7T1 application, or X9429WV14IZ-2.7T1 equivalent, this device supports power-on recall of DR0 to WCR, <3 µA standby current, 100-year data retention, and hardware write protection via WP pin - critical for embedded sensor calibration and industrial power supply tuning.

Technical Context

The X9429WV14IZ-2.7T1 integrates a monolithic CMOS resistor ladder with 63 discrete segments and 64 tap points, decoded by a 6-bit WCR to select one wiper switch at a time. Its 2-wire bus interface supports read/write/transfer operations including increment/decrement mode for real-time fine-tuning without host CPU intervention.

It features dual-mode operation: as a three-terminal potentiometer (RH/VH, RL/VL, RW/VW) or two-terminal variable resistor. Non-volatile writes to DRs require high-voltage timing (tWR = 5–10 ms), while wiper position updates via WCR load or INC/DEC commands settle within 10 µs (tWRL/tWRID).

Key Specifications

Pinout & Package

Package: 14-lead TSSOP (4.4 mm width), RoHS-compliant, moisture sensitivity level (MSL) rated per IPC/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 AD5170BRMZ-10 and MCP4017T-103I/OT, the X9429WV14IZ-2.7T1 uniquely combines hardware write protection, DR0 power-on recall, and 100-year data retention - making it optimal for unattended industrial sensors and safety-critical power management where firmware-independent reliability is mandatory.

Availability

X9429WV14IZ-2.7T1 is available at Aetrix Electronics and suitable for industrial power supplies, audio equipment, sensor signal conditioning, and RF bias networks requiring stable component supply with guaranteed long-term availability.

Supply support for X9429WV14IZ-2.7T1 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 family was designed for digitally programmable analog trimming in embedded systems where mechanical potentiometers fail due to wear, vibration, or environmental stress - targeting calibration stability and field-serviceability.

FAQ

What is the power-up behavior of the X9429WV14IZ-2.7T1?

On power-up, the X9429WV14IZ-2.7T1 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 recall function ensures repeatable startup behavior in systems like voltage regulators or sensor interfaces where consistent initial calibration is required. The X9429WV14IZ-2.7T1 does not require initialization code to restore a known state.

Does the X9429WV14IZ-2.7T1 support true I²C compliance?

The X9429WV14IZ-2.7T1 implements a 2-wire serial interface compatible with standard I²C timing and protocol conventions, including START/STOP conditions, ACK/NACK handshaking, and 7-bit slave addressing (with A0/A2/A3 inputs). It operates at up to 400 kHz clock frequency (fSCL) and meets tSU:STA, tHD:DAT, and other AC timing specs defined in the I²C specification. However, it does not support multi-master arbitration or clock stretching.

How many distinct wiper positions does the X9429WV14IZ-2.7T1 provide?

The X9429WV14IZ-2.7T1 provides exactly 64 discrete wiper positions, corresponding to a 6-bit Wiper Counter Register (WCR) that selects one of 63 resistive segments in series. Each position yields a predictable voltage division ratio between RH/VH and RL/VL terminals, with resolution of approximately 1.6% of total resistance. This count is fixed and confirmed in the datasheet's "64 Resistor Taps" feature and block diagram.

Can the X9429WV14IZ-2.7T1 be used as a two-terminal variable resistor?

Yes, the X9429WV14IZ-2.7T1 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 unused terminal open or grounded depending on topology. This mode is explicitly supported in the datasheet's "Circuit Level Applications" and "Basic Configurations" sections and is commonly used for current limiting or gain-setting where only resistance variation-not voltage division-is needed.

What is the maximum allowable voltage across the potentiometer terminals of the X9429WV14IZ-2.7T1?

The absolute maximum voltage difference |VH − VL| across the potentiometer terminals of the X9429WV14IZ-2.7T1 is 5 V, as specified in the Absolute Maximum Ratings table. Exceeding this limit risks permanent damage to the internal resistor array or CMOS switches. Additionally, VCC must always be ≥ VH, VL, and VW to prevent reverse-biasing of internal junctions - a hard design constraint enforced by the device's architecture.