Renesas ISL23415WFUZ

Overview

ISL23415WFUZ from Renesas Electronics is a volatile, low-voltage, 256-tap digitally controlled potentiometer (DCP) with SPI interface, 10kΩ end-to-end resistance, 70Ω typical wiper resistance at 3.3V, and operation from 1.7V to 5.5V VCC and 1.2V to 5.5V VLOGIC - used for precision gain adjustment in battery-powered medical instruments and LCD bias compensation.

For engineers reviewing the ISL23415WFUZ datasheet, ISL23415WFUZ pinout, ISL23415WFUZ application, or ISL23415WFUZ equivalent, this page delivers verified electrical parameters, validated MSOP-10 pin mapping, confirmed shutdown behavior, and real-world use cases in power margining and RF amplifier bias control - all traceable to FN7780 Rev.3.00.

Technical Context

The ISL23415WFUZ implements a monolithic CMOS resistor ladder with CMOS wiper switches, supporting both voltage divider and rheostat configurations. Its volatile Wiper Register (WR) defaults to 128 (mid-scale) at power-up and is directly accessible via SPI mode 0, with rising-edge clock capture on SDI and falling-edge data output on SDO.

It features independent analog (VCC) and logic (VLOGIC) supplies enabling direct interfacing with 1.2V microcontrollers without level shifters. Shutdown mode forces RH–RL open-circuit while shorting RW to RL through a 2kΩ internal resistor, with <2.8µA max shutdown current across -40°C to +125°C.

Key Specifications

Pinout & Package

ISL23415WFUZ is packaged in a Pb-free, RoHS-compliant 10-lead MSOP (M10.118), with exposed pad not electrically connected. Pin numbering follows standard top-view orientation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5170BRMZ-10 and MCP41HV51-103E/SN, the ISL23415WFUZ offers unique 1.2V logic compatibility and lower wiper resistance, making it optimal for ultra-low-power, mixed-voltage portable instrumentation where frequent dynamic adjustment and minimal signal path degradation are critical.

Availability

ISL23415WFUZ is available at Aetrix Electronics and suitable for power supply margining, RF amplifier biasing, LCD panel tuning, and portable medical calibration requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ISL23415WFUZ 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 connectivity solutions for automotive, industrial, and IoT applications.

The ISL23415 belongs to Renesas' XDCP™ family of digitally controlled potentiometers, designed specifically for replacing mechanical trimmers in battery-operated, space-constrained systems requiring programmable analog tuning with low power and wide supply flexibility.

FAQ

What is the default wiper position of the ISL23415WFUZ at power-up?

The ISL23415WFUZ powers up with its volatile Wiper Register (WR) preset to 128 (0x80), placing the wiper at mid-scale - i.e., approximately 5kΩ from both RH and RL terminals in voltage divider mode. This behavior is guaranteed across the full -40°C to +125°C operating range and does not require host initialization. The ISL23415WFUZ maintains this deterministic startup state regardless of prior shutdown or power cycling.

Can the ISL23415WFUZ operate with a 1.2V microcontroller SPI bus while powered from a 3.3V analog supply?

Yes - the ISL23415WFUZ supports independent VLOGIC (1.2V–5.5V) and VCC (1.7V–5.5V) supplies. When VLOGIC = 1.2V and VCC = 3.3V, the internal level shifter enables direct SPI communication without external translators. The device accepts 1.2V logic thresholds (VIH = 0.7×VLOGIC = 0.84V min) and drives SDO compatibly, making the ISL23415WFUZ ideal for mixed-voltage portable systems.

Does the ISL23415WFUZ support daisy-chaining, and how many devices can be cascaded?

Yes, the ISL23415WFUZ supports SPI daisy chaining via SDO-to-SDI connection. There is no fixed limit - the practical count depends on the driving strength of the host MCU's SCK and CS pins and bus capacitance. Renesas confirms functional operation with ≥4 devices in chain; for larger counts, buffering SCK/CS is recommended. All devices in the chain execute writes simultaneously on CS rising edge, enabling synchronized calibration.

What happens to the wiper position during shutdown mode of the ISL23415WFUZ?

In shutdown mode (SHDN bit = 0 in ACR), the ISL23415WFUZ opens the RH–RL path and internally shorts RW to RL through a 2kΩ resistor - effectively isolating the potentiometer from the signal path while preserving the current WR value. Upon exit from shutdown, the wiper returns to its pre-shutdown position within 1.5µs (tShdnRec), with no host reprogramming required. The ISL23415WFUZ retains full WR state volatility throughout.

Is the ISL23415WFUZ pin-compatible with other members of the ISL23415 family, such as the ISL23415TFUZ?

Yes - the ISL23415WFUZ and ISL23415TFUZ share identical 10-lead MSOP packaging (M10.118), identical pinout, and identical electrical interface. The only difference is total resistance: ISL23415WFUZ = 10kΩ, ISL23415TFUZ = 100kΩ. All timing, register maps, SPI protocol, and feature sets are identical; swapping requires only verification that 10kΩ meets the target circuit's impedance and power dissipation requirements.