Renesas ISL22416WFRT10Z

Overview

ISL22416WFRT10Z from Renesas Electronics (formerly Intersil) is a single-channel, 128-tap digitally controlled potentiometer (XDCP™) with SPI interface, non-volatile initial value storage, and 10kΩ end-to-end resistance. It operates from 2.7V to 5.5V, features 70Ω typical wiper resistance at 3.3V, and supports voltage divider or rheostat configurations in precision analog control loops.

For engineers reviewing the ISL22416WFRT10Z datasheet, ISL22416WFRT10Z pinout, ISL22416WFRT10Z application, or ISL22416WFRT10Z equivalent, key selection criteria include its 10kΩ resistance option, TDFN-10 package, shutdown mode (5µA max), ±50ppm/°C end-to-end tempco, and SPI Mode 0 compatibility for embedded calibration and trimming tasks.

Technical Context

The ISL22416WFRT10Z implements a monolithic CMOS resistor ladder with CMOS switch matrix, enabling precise wiper positioning via a 7-bit volatile Wiper Register (WR) and non-volatile Initial Value Register (IVR). Power-up recalls IVR contents into WR, ensuring repeatable startup behavior without host intervention.

Its SPI interface operates in Mode 0 (CPOL=0, CPHA=0), with data clocked in on SCK rising edge and out on falling edge. The SHDN pin and ACR register bit jointly control shutdown, placing RH–RL in open-circuit and RW–RL in short-circuit while preserving register accessibility.

Key Specifications

Pinout & Package

ISL22416WFRT10Z is housed in a 10-lead 3×3mm TDFN package (RoHS-compliant, e3 matte tin finish), optimized for space-constrained PCB layouts and thermal performance (θ_JA = 74°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL22416WFRT10Z, the ISL22416WFU10Z offers identical functionality in a larger MSOP package with higher thermal resistance, while the ISL22316WFRT10Z replaces SPI with I²C and removes hardware shutdown-requiring different firmware integration and power management strategy.

Availability

ISL22416WFRT10Z is available at Aetrix Electronics and suitable for LED driver calibration, power supply feedback trimming, audio balance control, and sensor signal conditioning requiring stable component supply across extended temperature ranges.

Supply support for ISL22416WFRT10Z 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 is a global semiconductor leader delivering microcontrollers, analog, power, and SoC solutions for automotive, industrial, and IoT applications.

The ISL22416WFRT10Z belongs to Renesas' XDCP™ (eXternally Digitally Controlled Potentiometer) family, designed specifically for replacing mechanical potentiometers in automated calibration, closed-loop control, and programmable analog signal conditioning systems.

FAQ

What is the total resistance and tolerance of the ISL22416WFRT10Z?

The ISL22416WFRT10Z has a nominal total resistance of 10kΩ with a tolerance of ±20% across temperature and unit-to-unit variation. This value is specified for the "W" option in the ordering matrix and confirmed in the Analog Specifications table on page 3 of FN6227 Rev 2.00. The device maintains monotonicity and linearity within this range under recommended operating conditions.

Does the ISL22416WFRT10Z retain its wiper setting after power cycling?

Yes, the ISL22416WFRT10Z retains its startup wiper position using the non-volatile Initial Value Register (IVR), which stores data for up to 50 years at temperatures ≤+55°C. At power-on, the IVR contents are automatically loaded into the volatile Wiper Register (WR), restoring the last calibrated position without host intervention. This behavior is documented in the Principles of Operation section (page 10).

How does the shutdown mode affect the DCP terminals in the ISL22416WFRT10Z?

In shutdown mode (activated by pulling SHDN low or setting ACR<6>=0), the ISL22416WFRT10Z places RH–RL in an open-circuit state and shorts RW to RL. This isolates the potentiometer from the circuit while preserving register contents. Normal operation resumes immediately upon exit from shutdown, with RW returning to its pre-shutdown resistance setting. This is detailed in the Pin Description section (page 9) and Shutdown Mode table (page 11).

What SPI mode does the ISL22416WFRT10Z support, and what are the timing requirements?

The ISL22416WFRT10Z supports SPI Mode 0 (CPOL=0, CPHA=0), with data sampled on the SCK rising edge and shifted out on the falling edge. Maximum SCK frequency is 5MHz, with minimum clock cycle time of 200ns, setup/hold times of 50ns each, and rise/fall times ≤20ns. These values are specified in the Serial Interface Specifications table (page 5) and validated across -40°C to +125°C.

Can the ISL22416WFRT10Z be used in rheostat (two-terminal) configuration?

Yes, the ISL22416WFRT10Z supports rheostat operation by connecting either RW–RL or RW–RH while leaving the third terminal unconnected. In this mode, it provides programmable resistance from near-0Ω to 10kΩ with integral non-linearity ≤±1 MI and differential non-linearity ≤±1 MI for the 10kΩ variant. Performance curves for rheostat mode are shown in Figures 7 and 8 (pages 8–9) of FN6227 Rev 2.00.