Renesas ISL22416WFRT10Z-TK

Overview

ISL22416WFRT10Z-TK from Renesas Electronics (formerly Intersil) is a single-channel digitally controlled potentiometer (XDCP™) with SPI interface, 128-tap resolution, 10kΩ end-to-end resistance, non-volatile wiper position storage, and shutdown mode. It functions as a programmable three-terminal potentiometer or two-terminal rheostat in precision analog adjustment circuits.

For engineers reviewing the ISL22416WFRT10Z-TK datasheet, ISL22416WFRT10Z-TK pinout, ISL22416WFRT10Z-TK application, or ISL22416WFRT10Z-TK equivalent, key selection criteria include its 10kΩ resistance option, TDFN-10 package, -40°C to +125°C operating range, 70Ω typical wiper resistance at 3.3V, and SPI-compatible serial control with non-volatile recall on power-up.

Technical Context

The ISL22416WFRT10Z-TK implements a monolithic CMOS resistor ladder with CMOS switch matrix controlled by a 7-bit volatile Wiper Register (WR) and backed by a non-volatile Initial Value Register (IVR). Its SPI Mode 0 interface operates up to 5MHz with data clocked in on SCK rising edge and out on falling edge.

Shutdown is asserted via active-low SHDN pin or ACR register bit, placing RH–RL in open-circuit and RW shorted to RL while preserving register access. Power-on recall loads IVR contents into WR within 3ms after VCC exceeds 2.6V, enabling deterministic startup behavior without host intervention.

Key Specifications

Pinout & Package

ISL22416WFRT10Z-TK is housed in a Pb-free, RoHS-compliant 10-lead 3×3mm TDFN package (JEDEC MO-229, pkg drawing L10.3x3B), featuring an exposed thermal pad for enhanced power dissipation in compact layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL22416WFRT10Z-TK, the MSOP variant offers footprint compatibility at the cost of thermal performance, while the ISL22316 replaces SPI with I²C and removes dedicated shutdown control-making ISL22416WFRT10Z-TK optimal for SPI-based designs requiring robust low-power management.

Availability

ISL22416WFRT10Z-TK is available at Aetrix Electronics and suitable for motor control bias adjustment, programmable sensor gain calibration, and industrial DAC output trimming requiring stable component supply across extended temperature ranges.

Supply support for ISL22416WFRT10Z-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 acquired Intersil in 2017 and continues to manufacture and support its precision analog portfolio, including XDCP™ digital potentiometers.

The ISL22416 series was designed for high-reliability industrial and automotive applications demanding non-volatile configuration storage, wide temperature operation, and low-noise analog programmability.

FAQ

What is the maximum SPI clock frequency supported by the ISL22416WFRT10Z-TK?

The ISL22416WFRT10Z-TK supports SPI clock frequencies up to 5MHz, with minimum clock cycle time of 200ns, high/low times of 100ns each, and setup/hold times of 50ns. This allows sub-microsecond wiper updates and efficient integration into real-time control loops without burdening the host processor.

Does the ISL22416WFRT10Z-TK retain its wiper position after power cycling?

Yes-the ISL22416WFRT10Z-TK automatically recalls the value stored in its non-volatile Initial Value Register (IVR) to the volatile Wiper Register (WR) within 3ms after VCC rises above 2.6V. This ensures repeatable startup behavior without requiring host MCU initialization.

How does the shutdown mode affect the ISL22416WFRT10Z-TK's terminals?

In shutdown mode (SHDN pin low or ACR[6]=0), the ISL22416WFRT10Z-TK opens the RH–RL path and shorts RW to RL. The SPI interface remains fully accessible, allowing register reads/writes-including IVR updates-while consuming ≤5µA supply current.

What is the wiper resistance specification for the ISL22416WFRT10Z-TK?

The ISL22416WFRT10Z-TK has a typical wiper resistance of 70Ω at VCC = 3.3V, with a maximum of 200Ω across temperature and process variations. This low on-resistance minimizes signal attenuation and nonlinearity when used in precision gain-setting or biasing applications.

Can the ISL22416WFRT10Z-TK be used as a two-terminal variable resistor?

Yes-the ISL22416WFRT10Z-TK can operate as a two-terminal rheostat by connecting either RH or RL to the same node as RW, leaving the unused terminal unconnected. Its monotonic 128-tap structure and make-before-break switching ensure stable, glitch-free resistance adjustment.