Renesas X9400WS24IZ

Overview

X9400WS24IZ 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, and delivers 10kΩ or 2.5kΩ end-to-end resistance per potentiometer - used for precision voltage divider tuning in programmable power supplies and sensor calibration circuits.

For engineers reviewing the X9400WS24IZ datasheet, X9400WS24IZ pinout, X9400WS24IZ application, or X9400WS24IZ equivalent, this device enables digital replacement of mechanical pots in closed-loop analog control systems requiring stable wiper position retention across power cycles, low standby current (<1µA), and SPI-configurable multi-pot coordination.

Technical Context

The X9400WS24IZ 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 potentiometer has four 6-bit nonvolatile Data Registers (DR0–DR3) supporting up to 100,000 write cycles and 100-year data retention.

SPI communication uses CS, SCK, SI, and SO pins with support for read/write WCR/DR, global transfer, increment/decrement, and status polling. Hardware write protection (WP) disables nonvolatile writes, while HOLD enables serial bus pause without reset - all operating within -40°C to +85°C industrial temperature range.

Key Specifications

Pinout & Package

Package: 24-lead SOIC (300 mil), RoHS-compliant Pb-free plus anneal finish, M24.3 package drawing.

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/P, the X9400WS24IZ uniquely combines quad-channel SPI control, ±5V analog rails, nonvolatile power-on recall, and 10kΩ end-to-end resistance - making it optimal for industrial analog signal chains requiring robust, self-contained calibration persistence.

Availability

X9400WS24IZ is available at Aetrix Electronics and suitable for programmable power supplies, sensor signal conditioning, audio volume control, and industrial process controllers requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for X9400WS24IZ 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, delivering high-reliability solutions for industrial, automotive, and infrastructure markets.

The X9400 series was designed specifically for replacing mechanical potentiometers in digitally calibrated analog systems - emphasizing nonvolatile wiper storage, low-power operation, and robust SPI interface integrity under industrial conditions.

FAQ

What is the analog voltage range supported by the X9400WS24IZ?

The X9400WS24IZ supports analog supply rails V+ and V− ranging from -5V to +5V, enabling true bipolar operation. This allows the device to interface directly with AC-coupled signals, op-amp inputs referenced to negative rails, and sensor bridges requiring bidirectional excitation - all while maintaining specified linearity and wiper resistance performance. The digital VCC domain remains independent at 2.7V–5.5V.

Does the X9400WS24IZ retain wiper position after power cycling?

Yes, the X9400WS24IZ automatically loads the contents of Data Register 0 (DR0) into the Wiper Counter Register (WCR) on power-up. This nonvolatile recall ensures that calibrated settings - such as voltage reference points in power supplies or sensor offset nulls - are restored without host intervention. DR0 must be pre-programmed during initial setup or field calibration to enable this behavior.

Can multiple X9400WS24IZ devices share the same SPI bus?

Yes, up to four X9400WS24IZ devices can operate on a single SPI bus using the A0 and A1 address pins to configure unique 2-bit device addresses. Each device responds only when its address matches the least significant bits of the 8-bit slave ID byte (0101xxBB format). CS lines must remain independent, but SCK, SI, and SO may be shared with proper tri-state management.

What is the maximum SPI clock frequency supported by the X9400WS24IZ?

The X9400WS24IZ supports SPI clock frequencies up to 2.0 MHz, with minimum cycle time of 500 ns, high/low pulse widths of 200 ns each, and strict setup/hold timing requirements (50 ns). This allows reliable communication with most microcontrollers without requiring wait states, while maintaining signal integrity in noisy industrial environments when routed with appropriate PCB layout practices.

How does the hardware write protect (WP) pin function on the X9400WS24IZ?

The WP pin on the X9400WS24IZ disables all nonvolatile write operations to Data Registers DR0–DR3 when held LOW. While WP is active, instructions like Write Data Register or XFR WCR→DR will execute but not commit to nonvolatile memory - preventing accidental overwrites of calibrated values. Volatile WCR writes and reads remain fully functional, allowing runtime adjustment without risking stored configuration.