Renesas X9400WV24Z

Overview

X9400WV24Z from Intersil is a quad digitally controlled potentiometer (XDCP™) integrating four independent 64-tap resistor arrays with SPI interface, nonvolatile data registers, and power-on wiper recall. It operates from 2.7V to 5.5V VCC, supports ±5V analog rails, delivers 40Ω typical wiper resistance at 5V, and provides 10kΩ or 2.5kΩ end-to-end resistance options for precision analog control in embedded signal conditioning circuits.

For engineers reviewing the X9400WV24Z datasheet, X9400WV24Z pinout, X9400WV24Z application, or X9400WV24Z equivalent, this device serves as a drop-in digital replacement for mechanical potentiometers in voltage divider, gain-setting, offset adjustment, and filter tuning applications requiring nonvolatile wiper position storage and low-power operation.

Technical Context

The X9400WV24Z implements four independent 63-segment resistor arrays, each controlled by a volatile 6-bit Wiper Counter Register (WCR) decoded to select one of 64 tap points. Each array features dedicated VH/RH, VL/RL, and VW/RW terminals, enabling three-terminal potentiometer or two-terminal variable resistor configurations.

It uses standard SPI protocol (CS, SCK, SI, SO) with dual-address pins (A0/A1) supporting up to four devices on one bus. Hardware write protection (WP) disables nonvolatile writes, while HOLD enables serial communication pause without reset - all operating under 1µA standby current and 100-year data retention.

Key Specifications

Pinout & Package

Package: 24-lead TSSOP (4.4mm width), RoHS-compliant, Pb-free plus anneal finish.

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 X9400WV24Z uniquely supports independent ±5V analog rails, delivers lower wiper resistance for precision gain control, and offers guaranteed 100-year data retention - making it optimal for high-reliability, bipolar-signal, and long-lifecycle applications.

Availability

X9400WV24Z is available at Aetrix Electronics and suitable for audio signal conditioning, precision sensor calibration, programmable filter design, and industrial offset nulling requiring stable component supply and long-term calibration integrity.

Supply support for X9400WV24Z 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 precision analog and power management semiconductor provider, now part of Renesas Electronics, with deep expertise in high-reliability interface and signal-conditioning ICs.

The X9400 product line was designed for replacing mechanical potentiometers in mission-critical analog control loops - emphasizing nonvolatile configuration storage, low wiper resistance, and robust bipolar signal handling.

FAQ

What is the recommended power-up sequence for reliable wiper position recall in the X9400WV24Z?

The X9400WV24Z requires strict sequencing: VCC must stabilize first, followed by application of analog voltages to VH/VL/VW pins. V+ and V− must reach final values before issuing any SPI command. Glitches on VCC must stay below 100mV, and VCC must fall below 0.1V for >1 second before repowering to ensure correct DR0-to-WCR load. This ensures deterministic power-on behavior in the X9400WV24Z.

Can the X9400WV24Z operate with bipolar analog signals while powered from a single 3.3V supply?

Yes. The X9400WV24Z separates digital (VCC/VSS) and analog (V+/V−) supplies. With VCC = 3.3V, V+ can be set to +5V and V− to −5V, enabling full ±5V signal swing across all four potentiometer arrays. This architecture allows true bipolar operation independent of logic supply voltage - a key capability of the X9400WV24Z.

How does hardware write protection (WP) function in the X9400WV24Z, and what operations does it block?

In the X9400WV24Z, pulling WP LOW disables all nonvolatile write operations: Write Data Register, XFR WCR-to-DR, Global XFR WCR-to-DR, and any instruction triggering internal high-voltage programming. Volatile operations - including Read/Write WCR, Increment/Decrement, and Read Status - remain fully functional. This protects factory calibration stored in DR0–DR3 during field operation of the X9400WV24Z.

What is the maximum SPI clock frequency supported by the X9400WV24Z, and how does it affect wiper update latency?

The X9400WV24Z supports SPI clock frequencies up to 2MHz. At this rate, a Write Wiper Counter Register command (3-byte sequence) completes in ≈1.5µs, and wiper movement becomes effective within 10µs (tWRL). For real-time tuning, the Increment/Decrement instruction responds in <450ns per step - enabling fine-grained, cycle-by-cycle adjustment without host CPU intervention in the X9400WV24Z.

Does the X9400WV24Z support daisy-chained SPI connections, and how is SO configured for this topology?

Yes. The X9400WV24Z SO pin is tri-state push-pull, allowing connection to a shared SPI bus with other SO-capable devices. When CS is HIGH, SO enters high-impedance state - enabling multiple X9400WV24Z units (or mixed devices) on one SO line. Host firmware must manage chip selection and avoid simultaneous SO asserts; no external pull-ups or buffers are required for daisy-chaining the X9400WV24Z.