Renesas ISL22326WFV14Z

Overview

ISL22326WFV14Z from Renesas Electronics is a dual digitally controlled potentiometer (XDCP™) IC with non-volatile wiper storage, 128-tap resolution per channel, I²C interface, and 14-lead TSSOP package. It operates from 2.7V to 5.5V, delivers 70Ω typical wiper resistance at 3.3V, and supports shutdown mode with ≤5µA current. It serves as programmable voltage divider or rheostat in precision analog trimming circuits.

For engineers reviewing the ISL22326WFV14Z datasheet, ISL22326WFV14Z pinout, ISL22326WFV14Z application, or ISL22326WFV14Z equivalent, key selection considerations include dual-channel monotonicity (±1 LSB INL), end-to-end resistance options (10kΩ/50kΩ), non-volatile recall timing (≤3ms), I²C address flexibility (3-pin selectable, up to 8 devices/bus), and shutdown behavior (RH–RL open, RW shorted to RL).

Technical Context

The ISL22326WFV14Z integrates two independent 7-bit (128-tap) resistor arrays with CMOS switch-based wiper control, each backed by volatile Wiper Registers (WR) and non-volatile Initial Value Registers (IVR). Power-up automatically loads IVR contents into WRs, enabling repeatable startup positions without host intervention.

Its I²C slave interface supports standard-mode (≤400kHz) operation with open-drain SDA/SCL, three address pins (A0–A2), and integrated make-before-break switching to prevent glitches during tap transitions. Shutdown is activated either via SHDN pin (active-low) or ACR register bit, placing RH–RL in open-circuit and RW–RL in short-circuit configuration while preserving register accessibility.

Key Specifications

Pinout & Package

ISL22326WFV14Z uses a 14-lead TSSOP package (JEDEC MO-153, 5.0mm × 4.4mm × 1.2mm). Pin 1 is VCC; pin 9 is GND; pins 3–5 and 10–12 serve dedicated DCP terminals; pins 2, 6–8, 13–14 handle I²C and addressing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL22326WFV14Z, AD5242BRUZ10 offers higher resolution but lacks dual channels and non-volatile recall, while MCP45HV51-103E/ST supports higher DCP voltages but omits shutdown capability-making ISL22326WFV14Z optimal for dual-rail, low-power, self-recalling industrial trimming.

Availability

ISL22326WFV14Z is available at Aetrix Electronics and suitable for industrial sensor calibration, programmable power supply feedback, and motor drive current sensing offset applications requiring stable component supply, long-term parametric consistency, and extended temperature operation.

Supply support for ISL22326WFV14Z 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

Renesas Electronics is a global semiconductor leader delivering microcontrollers, analog power, and SoC solutions for automotive, industrial, and IoT markets.

The ISL22326WFV14Z belongs to Renesas' XDCP™ family of digitally controlled potentiometers, engineered for precision analog trimming in harsh environments where mechanical potentiometers fail-emphasizing non-volatility, monotonicity, and extended temperature reliability.

FAQ

What is the default wiper position of ISL22326WFV14Z at power-up before non-volatile recall?

At initial power-on, before IVR contents are loaded, all wiper registers (WR0 and WR1) reset to 40h (64 decimal), positioning each wiper near the electrical midpoint of its respective resistor array. This occurs within microseconds of VCC crossing POR threshold. The ISL22326WFV14Z then recalls the stored IVR values into WRs within ≤3ms, finalizing the calibrated startup position.

Can ISL22326WFV14Z operate with VCC = 2.5V?

No. ISL22326WFV14Z has a minimum recommended VCC of 2.7V per datasheet Section 2.2. Operation below 2.7V risks unreliable I²C communication, incomplete non-volatile recall, and undefined wiper behavior. The absolute minimum rating is −0.3V to +6V, but functional operation is only guaranteed from 2.7V to 5.5V. Using 2.5V violates the recommended operating conditions for ISL22326WFV14Z.

Does ISL22326WFV14Z support simultaneous update of both DCP channels?

No. The ISL22326WFV14Z does not support atomic dual-channel write. Each wiper register (WR0 at address 0x00, WR1 at address 0x01) must be written individually via separate I²C transactions. There is no broadcast or group-write command. To minimize timing skew, users should execute writes back-to-back with minimal delay and confirm completion via ACK polling before relying on synchronized behavior of ISL22326WFV14Z.

How does shutdown mode affect the analog terminals of ISL22326WFV14Z?

In shutdown mode (SHDN pin low or ACR[6] = 0), ISL22326WFV14Z opens the connection between RH and RL terminals of both DCPs, while shorting each RW terminal to its corresponding RL terminal. This isolates the resistor arrays from signal paths and prevents leakage through unused taps. The I²C interface remains fully accessible, allowing register reads/writes-including IVR updates-without exiting shutdown.

Is the 10kΩ resistance option of ISL22326WFV14Z indicated by the 'W' in the part number?

Yes. Per Renesas ordering information (Datasheet Page 18), the suffix 'W' in ISL22326WFV14Z denotes the 10kΩ total resistance option (RTOTAL = 10kΩ ±20%). The alternate 'U' suffix indicates 50kΩ. This resistance value is factory-programmed and cannot be changed in-circuit. The 'FV14Z' portion specifies the 14-lead TSSOP package, RoHS-compliant, and tape-and-reel packaging for ISL22326WFV14Z.