Renesas ISL22326UFR16Z

Overview

ISL22326UFR16Z from Renesas Electronics is a dual digitally controlled potentiometer (XDCP™) with non-volatile wiper position storage, I²C interface, 128-tap resolution, and selectable 10kΩ or 50kΩ end-to-end resistance. It operates from 2.7V to 5.5V, supports shutdown mode (≤5µA), and is used for precision analog trimming in sensor calibration, power supply feedback loops, and audio level control.

For engineers reviewing the ISL22326UFR16Z datasheet, ISL22326UFR16Z pinout, ISL22326UFR16Z application, or ISL22326UFR16Z equivalent, key selection criteria include I²C address configurability (A0–A2), dual independent DCP operation, non-volatile initial value recall at power-up, wiper resistance (70Ω typ. @3.3V), and QFN-16 package compatibility with high-density PCB layouts.

Technical Context

The ISL22326UFR16Z integrates two independent 7-bit (128-position) digitally controlled potentiometers on a single monolithic CMOS die, each with volatile Wiper Register (WR) and non-volatile Initial Value Register (IVR). Wiper movement uses make-before-break CMOS switches across resistor ladders, ensuring monotonicity and glitch-free transitions.

It implements a full I²C slave interface compliant with standard-mode (≤400kHz) timing, supporting up to eight devices per bus via three hardware address pins (A0–A2). Shutdown is asserted either by logic-low SHDN pin or ACR register bit, placing RH/RW/RL terminals in open-circuit (RH–RL) and shorted (RW–RL) states respectively while preserving register accessibility.

Key Specifications

Pinout & Package

ISL22326UFR16Z is packaged in a 16-lead QFN (4mm × 4mm, 0.5mm pitch) with exposed thermal pad internally connected to GND. Pin 1 is located at top-left corner (marked dot), and the package is RoHS-compliant and Pb-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5242BRUZ10 and MCP45HV51-103E/ST, the ISL22326UFR16Z uniquely combines dual DCPs, I²C address flexibility, hardware shutdown, and guaranteed non-volatile recall - making it optimal for space-constrained, self-calibrating industrial systems requiring zero-host intervention at startup.

Availability

ISL22326UFR16Z is available at Aetrix Electronics and suitable for industrial sensor calibration, programmable power supply feedback, and medical instrumentation gain setting requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for ISL22326UFR16Z 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 specializing in microcontrollers, analog power, and mixed-signal solutions for industrial, automotive, and infrastructure markets.

The ISL22326UFR16Z belongs to Renesas' XDCP™ family of digitally controlled potentiometers, designed specifically for high-reliability analog trimming in harsh environments where mechanical potentiometers fail due to wear, vibration, or contamination.

FAQ

What is the default wiper position of ISL22326UFR16Z at power-up?

At initial power-on before non-volatile recall completes, both wipers default to position 40h (64 decimal), placing them near the midpoint of their respective resistor arrays. Once VCC exceeds the power-on reset threshold (2.0–2.6V), the contents of the Initial Value Registers (IVRs) are loaded into the Wiper Registers (WRs), restoring the last-saved positions. This behavior is confirmed in Section 5.1 and Table 2.1 of the FN6176 datasheet for ISL22326UFR16Z.

Does ISL22326UFR16Z support true dual-channel independent operation?

Yes, ISL22326UFR16Z provides fully independent control of DCP0 (RH0/RL0/RW0) and DCP1 (RH1/RL1/RW1) via separate I²C register addresses (00h and 01h for WR access). Each has its own volatile Wiper Register and non-volatile Initial Value Register, enabling simultaneous, uncorrelated adjustments - critical for applications like differential gain/offset trimming. This independence is explicitly defined in Sections 4.1 and 5.1 of the ISL22326UFR16Z datasheet.

How does the SHDN pin affect analog functionality in ISL22326UFR16Z?

When SHDN is pulled low, ISL22326UFR16Z places RHi–RLi in open-circuit and shorts RWi to RLi for both DCPs - effectively disabling analog signal paths while preserving register state and I²C accessibility. This hardware-controlled isolation prevents leakage or unintended biasing in powered-down subsystems. The behavior is detailed in Figure 18 and Section 4.1.3 of the ISL22326UFR16Z datasheet.

What is the maximum I²C clock frequency supported by ISL22326UFR16Z?

The ISL22326UFR16Z supports standard-mode I²C operation up to 400kHz, as specified in Section 2.5 (Serial Interface Specifications) of the datasheet. Timing parameters including tLOW (1300ns min), tHIGH (600ns min), and tSU:STA (600ns min) are validated for reliable communication at this rate. Exceeding 400kHz may violate setup/hold margins and cause register access failures in ISL22326UFR16Z.

Can ISL22326UFR16Z be used in rheostat mode, and what are the key limitations?

Yes, ISL22326UFR16Z supports rheostat configuration by connecting either RH or RL to RW (e.g., RW–RL for variable resistance). Key limitations include ±0.5 LSB DNL (U option) and ±1 LSB DNL (W option) in this mode, plus wiper resistance (70Ω typ.) contributing directly to total resistance. These values are measured and specified in Section 2.4 (Analog Specifications) of the ISL22326UFR16Z datasheet.