Renesas X9400WV24IZ-2.7

Overview

X9400WV24IZ-2.7 from Intersil is a quad digitally controlled potentiometer (XDCP™) with 64-tap resolution per channel, SPI serial interface, nonvolatile wiper position storage, and 2.7V to 5.5V system supply operation. It integrates four independent 10 kΩ or 2.5 kΩ end-to-end resistor arrays, each with 40 Ω typical wiper resistance at 5 V, enabling precise analog voltage/current control in embedded signal conditioning circuits.

For engineers reviewing the X9400WV24IZ-2.7 datasheet, X9400WV24IZ-2.7 pinout, X9400WV24IZ-2.7 application, or X9400WV24IZ-2.7 equivalent, this device serves as a drop-in replacement for mechanical potentiometers in calibration-critical, low-power, and space-constrained designs requiring stable wiper recall on power-up and multi-setting storage across four channels.

Technical Context

The X9400WV24IZ-2.7 implements four independent 63-segment resistor arrays with CMOS-switched wiper terminals, each controlled by a volatile 6-bit Wiper Counter Register (WCR) and backed by four 6-bit nonvolatile Data Registers (DR0–DR3). Power-on recall loads DR0 into the WCR, ensuring deterministic startup behavior without host intervention.

Its SPI interface supports full-duplex read/write of wiper positions and data registers, global transfers across all pots, and real-time increment/decrement via clocked SI state-enabling fine-grained tuning without command overhead. Hardware write protection (WP) and dual analog supplies (V+ = –5.5 V to +5.5 V, V– = –5.5 V to –2.7 V) support bipolar signal routing while maintaining 1 µA max standby current.

Key Specifications

Pinout & Package

Package: 24-lead TSSOP (4.4 mm 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 X9400WV24IZ-2.7, AD5204BRUZ10 lacks bipolar analog support and has higher wiper resistance, while MCP42050-I/SL omits nonvolatile storage-making X9400WV24IZ-2.7 uniquely suited for self-contained, recalibration-free analog control in harsh or maintenance-limited environments.

Availability

X9400WV24IZ-2.7 is available at Aetrix Electronics and suitable for industrial sensor calibration, programmable power supplies, medical instrument offset adjustment, and audio signal level control requiring stable component supply and long-term parameter retention.

Supply support for X9400WV24IZ-2.7 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 company, now part of Renesas Electronics, with expertise in high-reliability mixed-signal ICs for industrial, medical, and communications systems.

The X9400 family was designed specifically for replacing mechanical potentiometers in digitally calibrated analog signal paths-emphasizing nonvolatile storage, low wiper resistance, and robust SPI control for embedded systems requiring zero-touch configuration persistence.

FAQ

What is the recommended power-up sequence for reliable wiper recall in the X9400WV24IZ-2.7?

The X9400WV24IZ-2.7 requires strict sequencing: VCC must stabilize first, followed by analog supplies V+ and V–, then potentiometer terminals (VH/VL/VW). VCC ramp rate must be between 0.2–50 V/ms; glitches under 100 mV are acceptable. If VCC drops below 0.1 V, hold it there >1 second before reapplying to ensure DR0 loads correctly into the WCR on next power-up. This sequence is critical for guaranteed X9400WV24IZ-2.7 wiper recall behavior.

Does the X9400WV24IZ-2.7 support true bipolar analog operation, and what are the voltage limits?

Yes, the X9400WV24IZ-2.7 supports true bipolar analog operation. Its V+ pin accepts –5.5 V to +5.5 V, and V– pin accepts –5.5 V to –2.7 V, enabling wiper output swings across the full –5 V to +5 V range when used with appropriate op-amps. This is confirmed in the Absolute Maximum Ratings and Recommended Operating Conditions tables of the FN8189 datasheet. The X9400WV24IZ-2.7 thus functions as a fully rail-to-rail analog element-not just a digital controller-with verified performance down to –2.7 V on V–.

How does the hardware write protect (WP) pin function on the X9400WV24IZ-2.7, and when should it be asserted?

The WP pin on the X9400WV24IZ-2.7 disables all nonvolatile write operations-including Write Data Register, XFR WCR to DR, and Global XFR-when held LOW. It does not affect volatile wiper updates (Write WCR, Increment/Decrement) or reads. WP should be held HIGH during normal calibration or field updates, and pulled LOW during system runtime to prevent accidental overwrites of stored DR0–DR3 values. This hardware lock complements software safeguards and is active regardless of CS or SPI state, making X9400WV24IZ-2.7 suitable for safety-critical calibration retention.

Can the X9400WV24IZ-2.7 be used as a two-terminal variable resistor, and how is it configured?

Yes, the X9400WV24IZ-2.7 can operate as a two-terminal variable resistor by connecting either VH or VL to the wiper VW (e.g., VH → VW), leaving the other terminal open or grounded depending on polarity needs. In this mode, resistance varies from near-zero (wiper at connected terminal) to full RTOTAL (wiper at opposite terminal). The datasheet explicitly confirms this usage in the DESCRIPTION section and Application Circuits (Page 16). For X9400WV24IZ-2.7, this yields a 0–10 kΩ or 0–2.5 kΩ digitally adjustable resistance with 64-step resolution and nonvolatile storage-ideal for programmable current limiting or bias setting.

What is the maximum SPI clock frequency supported by the X9400WV24IZ-2.7, and are there timing constraints for HOLD usage?

The X9400WV24IZ-2.7 supports SPI clock frequencies up to 2.0 MHz, with minimum high/low times of 200 ns each (tWH/tWL). HOLD must be asserted only when SCK is LOW; bringing HOLD LOW while SCK is HIGH violates timing and may corrupt the serial sequence. Resume requires HOLD HIGH while SCK remains LOW. These constraints are specified in the AC Timing table (Page 13) and Hold Timing diagram (Page 15). For robust operation, X9400WV24IZ-2.7 implementations should enforce SCK idle-low discipline and use HOLD exclusively for controlled pause/resume-not as a general chip select substitute.