Renesas X9409WV24IZ

Overview

X9409WV24IZ from Intersil (now Renesas) is a quad digitally controlled potentiometer (XDCP) IC implementing four independent 64-tap, 10kΩ resistor arrays with volatile wiper counter registers and four nonvolatile data registers per channel. It operates from 2.7V to 5.5V, features 50Ω typical wiper resistance, and interfaces via a 2-wire I²C-compatible bus for wiper position control and nonvolatile storage. It is used in precision analog trimming, programmable gain/offset adjustment, and voltage regulator feedback networks.

For engineers reviewing the X9409WV24IZ datasheet, X9409WV24IZ pinout, X9409WV24IZ application, or X9409WV24IZ equivalent, key selection criteria include its 24-lead TSSOP package, 2.7V minimum supply, 100-year data retention, 100,000-cycle register endurance, and hardware write-protection via WP pin - all critical for industrial sensor calibration and power management designs requiring long-term parameter stability.

Technical Context

The X9409WV24IZ integrates four monolithic CMOS resistor arrays, each composed of 63 series-connected resistive elements with CMOS-switched wiper taps. Wiper position is controlled by a 6-bit volatile Wiper Counter Register (WCR), which loads DR0 on power-up and supports direct write, register transfer, or incremental/decremental adjustment via I²C.

Its 2-wire interface complies with standard I²C timing (400kHz max clock, tHIGH ≥ 600ns), supports up to 16 devices on-bus via A0–A3 address inputs, and includes ACK polling for nonvolatile write completion detection. Hardware write protection (WP pin) disables DR writes when asserted low, ensuring configuration integrity during system operation.

Key Specifications

Pinout & Package

Package: 24-lead TSSOP (4.4mm width), RoHS-compliant, moisture sensitivity level (MSL) per TB363.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digitally controlled potentiometer applications.

Compared with AD5204BRUZ10 and MCP42050-I/SL, the X9409WV24IZ offers native I²C support with hardware write protection and guaranteed 10kΩ end-to-end resistance - making it optimal for space-constrained, I²C-based industrial control systems requiring robust configuration persistence.

Availability

X9409WV24IZ is available at Aetrix Electronics and suitable for industrial sensor calibration, programmable power supplies, and embedded audio level control requiring stable component supply and long-term parameter retention.

Supply support for X9409WV24IZ 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 (acquired by Renesas Electronics in 2017) is a semiconductor company specializing in high-performance analog and mixed-signal ICs for power management, precision analog, and interface applications.

The X9409 series was designed as a drop-in digital replacement for mechanical potentiometers in industrial and communications equipment, emphasizing nonvolatile configuration storage, low-power operation, and robust I²C interoperability.

FAQ

What is the minimum operating voltage for the X9409WV24IZ?

The X9409WV24IZ operates down to 2.7V, as specified in its Absolute Maximum Ratings and Recommended Operating Conditions. This allows direct integration into 3.3V systems without level-shifting circuitry. Operation below 2.7V may result in undefined behavior, including failure to recall DR0 on power-up or incomplete I²C acknowledge responses. The X9409WV24IZ datasheet confirms this limit applies across the full -40°C to +85°C industrial temperature range.

Does the X9409WV24IZ support true I²C communication?

Yes, the X9409WV24IZ implements a fully compliant 2-wire serial interface compatible with standard I²C protocols, including START/STOP conditions, 7-bit slave addressing (with 4-bit device address via A0–A3), and ACK/NACK handshaking. It supports 400kHz clock rates and adheres to I²C timing parameters such as tSU:STA (600ns), tHD:STA (600ns), and tR/tF (300ns). The X9409WV24IZ does not require special master firmware - standard I²C drivers can control all registers and wiper functions.

How many wiper positions does each potentiometer in the X9409WV24IZ provide?

Each of the four potentiometers in the X9409WV24IZ provides 64 discrete wiper positions, corresponding to a 6-bit Wiper Counter Register (WCR) that selects one of 63 resistive segments. This yields 64 distinct tap points - from VH/RH (WCR = 0x3F) to VL/RL (WCR = 0x00). The X9409WV24IZ datasheet explicitly states "64 resistor taps" and confirms the WCR is decoded to select one of sixty-four switches in the resistor array.

Can the X9409WV24IZ retain wiper settings after power cycling?

Yes - the X9409WV24IZ automatically loads the contents of Data Register 0 (DR0) into the volatile Wiper Counter Register (WCR) on every power-up, ensuring repeatable startup wiper positions. DR0 itself is nonvolatile with 100-year data retention and 100,000-cycle endurance. This behavior is guaranteed across the full industrial temperature range (-40°C to +85°C) and requires no host intervention. The X9409WV24IZ power-up sequence must meet VCC ramp rate specifications (0.2–50 V/ms) for reliable DR0 recall.

What is the function of the WP pin on the X9409WV24IZ?

The WP (Write Protect) pin on the X9409WV24IZ is a hardware-level enable/disable control for nonvolatile writes to the Data Registers (DR0–DR3). When WP is driven low, all DR write operations - including transfers from WCR to DR and direct DR writes - are blocked, preventing accidental or malicious configuration changes. The X9409WV24IZ continues normal wiper control and volatile register access regardless of WP state. This feature is documented in the Pin Descriptions and Principles of Operation sections of the X9409WV24IZ datasheet.