Renesas ISL23512WFRU10Z-TK

Overview

ISL23512WFRU10Z-TK from Intersil is a single push-button controlled volatile digital potentiometer (XDCP™) with 16 wiper tap points, 10kΩ end-to-end resistance, ±80ppm/°C end-to-end temperature coefficient, and shutdown mode. It operates from 2.7V to 5.5V, draws ≤3µA standby current, and is used for analog biasing and adjustable voltage division in space-constrained industrial controls.

For engineers reviewing the ISL23512WFRU10Z-TK datasheet, ISL23512WFRU10Z-TK pinout, ISL23512WFRU10Z-TK application, or ISL23512WFRU10Z-TK equivalent, key selection factors include its µTQFN-10 package footprint, push-button debounce timing (15–30ms), fast/slow wiper scan modes, zero-scale wiper position on power-up, and RH/RL/RW terminal configuration for voltage divider or rheostat use.

Technical Context

The ISL23512WFRU10Z-TK implements a 15-element resistor ladder with CMOS transfer gates controlled by a 4-bit up/down counter. Wiper positioning is driven exclusively by edge-triggered PU/PD inputs with internal pull-ups, and no serial interface or register access is present.

Shutdown mode is activated only when both PU and PD are held low for ≥2s, disconnecting RH and forcing wiper to RL. The device supports two operational modes: slow wiper step (100–375ms) for single taps and fast mode (25–75ms) after sustained button press >1s.

Key Specifications

Pinout & Package

ISL23512WFRU10Z-TK is housed in a 10-lead µTQFN package (2.05mm × 1.55mm, 0.5mm pitch) with exposed thermal pad. Pin 1 is marked by index area; pins 5, 8, and 10 are NC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5170BRMZ-10 and MCP4017T-103I/OT, the ISL23512WFRU10Z-TK uniquely combines push-button-native operation, ultra-low standby current (≤3µA), and guaranteed zero-scale power-up in a 2mm×1.6mm package-making it optimal for maintenance-free, human-interface analog trimming where MCU interaction is undesirable or unavailable.

Availability

ISL23512WFRU10Z-TK is available at Aetrix Electronics and suitable for volume control, LED brightness control, contrast adjustment, and programmable bias voltage generation requiring stable component supply across extended industrial temperature ranges.

Supply support for ISL23512WFRU10Z-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

Intersil Corporation (now part of Renesas Electronics) designs high-performance analog and mixed-signal ICs for industrial, computing, and communications markets, with emphasis on power management, precision analog, and interface solutions.

The ISL23512WFRU10Z-TK belongs to Intersil's XDCP™ (eXternally-Driven Controlled Potentiometer) family, engineered specifically for tactile, microcontroller-free analog trimming in space- and power-constrained industrial systems.

FAQ

What is the power-up behavior of the ISL23512WFRU10Z-TK?

The ISL23512WFRU10Z-TK initializes its wiper to the zero-scale position (tap 0, closest to RL) at power-up, ensuring a repeatable and deterministic starting point for all applications. This behavior is hardwired and does not require initialization commands or external reset signals. The device draws ≤3µA in standby immediately after VCC stabilization, and the RH–RL resistance remains at 10kΩ with ±20% tolerance. No special power sequencing is needed beyond maintaining VCC ≥ VRH/VRL.

Does the ISL23512WFRU10Z-TK support I²C or SPI communication?

No, the ISL23512WFRU10Z-TK does not support I²C, SPI, or any serial communication protocol. It is exclusively push-button controlled via dedicated PU and PD inputs with built-in debounce and auto-scan logic. All wiper positioning is performed through physical or logic-level button actuation-no firmware, clock lines, or address configuration is involved. This makes ISL23512WFRU10Z-TK ideal for systems lacking MCU resources or requiring direct human interface without software dependency.

How does shutdown mode function on the ISL23512WFRU10Z-TK?

Shutdown mode on the ISL23512WFRU10Z-TK activates when both PU and PD inputs are held low for ≥2 seconds. In this state, the RH terminal is fully disconnected from the resistor array, and the wiper is forced to the RL terminal (zero-scale position), reducing total current draw to ≤3µA. Shutdown exits immediately upon releasing either PU or PD; if PU or PD remains low >250ms post-exit, auto-increment or auto-decrement resumes. No external enable pin or voltage threshold is required-shutdown is purely timing-based and self-contained within ISL23512WFRU10Z-TK.

Can the ISL23512WFRU10Z-TK be used as a rheostat?

Yes, the ISL23512WFRU10Z-TK can be configured as a rheostat by connecting either RH or RL to the RW terminal (or leaving one floating), effectively creating a two-terminal variable resistor between RW and the remaining fixed terminal. In this mode, resistance varies from near 0Ω (wiper at same terminal) to 10kΩ (wiper at opposite terminal), with monotonic RDNL of −1 to +1MI and integral non-linearity of −1.5 to +1.5MI. The device maintains its 16-tap resolution and ±80ppm/°C end-to-end TC in rheostat configuration, supporting precision current-setting applications.

What are the absolute maximum ratings for the ISL23512WFRU10Z-TK?

The ISL23512WFRU10Z-TK has an absolute maximum VCC of −0.3V to +6V, PU/PD voltage range of −0.3V to VCC+0.3V, and DCP pin voltage range of −0.3V to VCC. Maximum wiper current is ±3.0mA, and storage temperature spans −65°C to +150°C. Exceeding these limits-even briefly-may cause permanent damage. Notably, the device is rated for extended industrial operation from −40°C to +125°C under recommended conditions (2.7V–5.5V VCC), and its µTQFN package has θJA = 150°C/W and θJC = 48.3°C/W for thermal design reference. These values are specified in the official FN6590 datasheet for ISL23512WFRU10Z-TK.