Renesas X9440WV24

Overview

X9440WV24 from Intersil is a mixed-signal IC integrating two nonvolatile digitally controlled potentiometers (XDCP™) and two voltage comparators in a single 24-lead TSSOP package. Each potentiometer offers 64-tap resolution, 10kΩ end-to-end resistance, and independent SPI-controlled wiper positioning; each comparator features programmable enable/latch/shutdown via ACR registers and compares VNI against VW with <200 ns response time. It enables programmable window detection, level sensing, and oscillator timing in industrial sensor interfaces.

For engineers reviewing the X9440WV24 datasheet, X9440WV24 pinout, X9440WV24 application, or X9440WV24 equivalent, this device supports dual-rail analog supplies (±5V), hardware write protection (WP), auto-recall from R0 on power-up, and 100,000-cycle EEPROM endurance - critical for embedded systems requiring stable, memory-retentive analog control without external DACs or comparators.

Technical Context

The X9440WV24 implements two independent 63-element resistor arrays, each decoded by a 6-bit volatile Wiper Counter Register (WCR) to select one of 64 tap points; wiper voltage VW is fed to the inverting input of its associated comparator. The comparator's output (VOUT) is buffered, logic-level compatible, and controlled by three bits in the Analog Control Register (ACR): shutdown, enable, and latch.

SPI communication uses standard four-wire interface (SCK, SI, SO, CS) with HOLD and WP pins for bus management and write protection. All register operations - direct WCR/ACR writes, data register transfers (R0–R3), increment/decrement, and status reads - follow defined instruction byte formats with P1/P0 and R1/R0 addressing fields, enabling precise per-pot and per-comparator configuration.

Key Specifications

Pinout & Package

Package: 24-lead TSSOP (0.420" body width, gull-wing leads). Pin numbering follows standard JEDEC outline with Pin 1 index mark at top-left corner when viewed top-side up.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5242BRUZ10 and MCP42010-I/P, the X9440WV24 uniquely integrates dual comparators with nonvolatile wiper storage and bipolar analog supplies - reducing BOM count and enabling self-contained, field-programmable analog monitoring without host intervention.

Availability

X9440WV24 is available at Aetrix Electronics and suitable for industrial sensor interfaces, programmable power supply monitors, and embedded test equipment requiring stable component supply, long-term calibration retention, and bipolar analog signal conditioning.

Supply support for X9440WV24 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 (now part of Renesas Electronics) is a semiconductor company specializing in precision analog, power management, and interface ICs for industrial, aerospace, and communications markets.

The X9440 product line was designed for embedded systems needing integrated, nonvolatile analog control - combining digitally adjustable resistance with decision-making comparators to replace multiple discrete components in sensor signal chains and programmable thresholds.

FAQ

What is the function of the WP pin on the X9440WV24?

The WP (Write Protect) pin on the X9440WV24 is an active-low hardware control that disables all nonvolatile writes to the Wiper Counter Registers (WCR) and Analog Control Registers (ACR) when asserted. When WP is held low, commands such as Write WCR, Write ACR, or Transfer to Data Register will not commit changes to EEPROM - protecting calibrated settings from accidental overwrite during normal operation or firmware updates. This feature ensures configuration integrity in deployed systems.

How does the X9440WV24 handle power-up initialization?

The X9440WV24 performs automatic recall of WCR and ACR contents from Data Register R0 upon power-up, ensuring immediate functional readiness without host initialization. This behavior is hardwired and occurs regardless of prior power-down state. The R0 values must be pre-programmed during manufacturing or commissioning; if unchanged, the device resumes its last stored configuration - critical for fail-safe analog control in unattended equipment like remote sensors or power monitors.

Can the X9440WV24 operate with single-supply analog inputs?

No - the X9440WV24 requires dual analog supplies (V+ and V−) to bias its resistor arrays and comparators. Per the datasheet, V+ must be +4.5 V to +5.5 V and V− must be −5.5 V to −4.5 V for the X9440WV24 variant, supporting true bipolar operation. Single-ended analog inputs (e.g., 0–5 V) can be applied to VNI pins, but the internal analog section itself depends on symmetric ±5 V rails to maintain specified linearity, offset, and comparator performance.

What is the maximum SPI clock frequency supported by the X9440WV24?

The X9440WV24 supports a maximum SPI clock frequency of 2 MHz, as specified in the AC Timing section of the datasheet. At this rate, serial instructions complete within defined setup/hold windows (tSU = 50 ns, tH = 50 ns), and SO output is valid within 100 ns after SCK falling edge. Operating above 2 MHz risks timing violations, corrupted register transfers, or failed nonvolatile writes - especially during high-voltage store cycles requiring precise clock alignment.

Does the X9440WV24 include EEPROM memory beyond wiper and ACR storage?

Yes - the X9440WV24 includes 16 bytes of general-purpose EEPROM memory distributed across four nonvolatile Data Registers (R0–R3), each holding 4 bytes. These registers are accessible via SPI and support read/write/transfer operations. They can store system parameters, calibration coefficients, user preferences, or any application-specific data - independent of wiper or comparator configuration - and retain values for 100 years with 100,000 write cycles per byte.