Renesas ISL23328WFRUZ-TK

Overview

ISL23328WFRUZ-TK from Renesas (formerly Intersil) is a dual, volatile, 128-tap digitally controlled potentiometer (DCP) with I²C interface, 10kΩ total resistance, 16-pin UTQFN package, and -40°C to +125°C operation. It functions as two independent programmable resistive dividers or rheostats in analog signal conditioning paths, supporting low-voltage battery-powered instrumentation and sensor trimming.

For engineers reviewing the ISL23328WFRUZ-TK datasheet, ISL23328WFRUZ-TK pinout, ISL23328WFRUZ-TK application, or ISL23328WFRUZ-TK equivalent, key selection criteria include its 10kΩ end-to-end resistance, 1.2V–5.5V VLOGIC independence, 70Ω typical wiper resistance at 3.3V, shutdown mode behavior, and guaranteed monotonicity in voltage divider and rheostat modes.

Technical Context

The ISL23328WFRUZ-TK integrates two independent DCP cores with volatile 8-bit wiper registers (WR0/WR1), each controlling a 128-step resistor ladder via CMOS switches operating in make-before-break mode. Its I²C interface supports up to eight devices on one bus using A0–A2 address pins and requires no external level shifter due to dedicated VLOGIC supply.

Each DCP operates in voltage divider mode (RH–RL–RW) or rheostat mode (RW–RL or RW–RH), with power-on reset to mid-scale (64 decimal), ±3mA max wiper current, and shutdown mode forcing end-to-end open circuit while connecting RW to RL internally via a 2kΩ resistor.

Key Specifications

Pinout & Package

ISL23328WFRUZ-TK uses a 16-lead 2.6mm × 1.8mm UTQFN package (Pb-free, RoHS compliant) with exposed thermal pad. Pin numbering follows top-view orientation per FN7902 Rev 1.00, Page 2.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5170BRMZ-10 and MCP45HV51-103E/MS, the ISL23328WFRUZ-TK uniquely delivers dual 128-tap DCPs with true 1.2V–5.5V VLOGIC independence in a compact UTQFN, making it optimal for space-constrained, ultra-low-voltage embedded systems requiring two coordinated analog adjustments.

Availability

ISL23328WFRUZ-TK is available at Aetrix Electronics and suitable for power supply margining, sensor trimming, battery-powered instrument gain control, and RF amplifier bias compensation requiring stable component supply across automotive, industrial, and medical device production programs.

Supply support for ISL23328WFRUZ-TK 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 Corporation acquired Intersil in 2017 and maintains full product support, documentation, and manufacturing continuity for the ISL23328 family.

The ISL23328 product line was designed for precision analog trimming in harsh-environment applications, emphasizing low-voltage operation, wide temperature range, and I²C configurability without external level translation.

FAQ

What is the default wiper position of the ISL23328WFRUZ-TK at power-on?

The ISL23328WFRUZ-TK powers up with both wiper registers (WR0 and WR1) preset to 64 decimal (0x40), placing each wiper at mid-scale between RH and RL terminals. This behavior is hardwired and occurs regardless of prior shutdown state or register contents, ensuring a known, safe initial analog configuration for systems like voltage references or bias networks.

Does the ISL23328WFRUZ-TK require external level shifters when interfaced with a 1.2V I²C master?

No, the ISL23328WFRUZ-TK does not require external level shifters. Its dedicated VLOGIC pin accepts 1.2V–5.5V, allowing direct connection to 1.2V I²C masters. The internal level shifter ensures reliable SDA/SCL communication without signal degradation or additional components-confirmed in FN7902 Section "Low Logic Levels" and Absolute Maximum Ratings.

Can the ISL23328WFRUZ-TK operate with different supply voltages on VCC and VLOGIC simultaneously?

Yes, the ISL23328WFRUZ-TK supports independent VCC (1.7V–5.5V) and VLOGIC (1.2V–5.5V) supplies. This allows, for example, VCC = 3.3V for analog signal integrity while VLOGIC = 1.8V for compatibility with low-power microcontrollers-explicitly validated in Recommended Operating Conditions and Functional Pin Descriptions of FN7902.

What happens to the wiper positions during shutdown mode of the ISL23328WFRUZ-TK?

In shutdown mode (SHDN bit = 0 in ACR register), the ISL23328WFRUZ-TK disconnects both DCP resistor arrays from the circuit and internally connects each RW pin to its corresponding RL pin via a 2kΩ resistor. Wiper register values (WR0/WR1) are retained, and wipers return to those positions within 1.5µs upon exit from shutdown-per Figure 25 and Shutdown Function section of FN7902.

Is the ISL23328WFRUZ-TK pin-compatible with other variants in the ISL23328 family?

No, the ISL23328WFRUZ-TK is not pin-compatible with TSSOP variants (e.g., ISL23328WFVZ-TK). It uses a 16-lead UTQFN package, whereas TSSOP versions use 14 leads with different pin assignments (e.g., NC on UTQFN vs. functional pin on TSSOP). Pin mapping must be verified against FN7902 Page 2 diagrams-no assumptions about mechanical or electrical interchangeability should be made.