Renesas ISL22416UFU10Z-TK

Overview

ISL22416UFU10Z-TK from Renesas Electronics (formerly Intersil) is a single-channel digitally controlled potentiometer (XDCP™) with SPI interface, 128-tap resolution, non-volatile initial value storage, and 50kΩ end-to-end resistance. It operates from 2.7V to 5.5V, delivers 70Ω typical wiper resistance at 3.3V, and supports voltage divider or rheostat configurations in precision analog trimming applications.

For engineers reviewing the ISL22416UFU10Z-TK datasheet, ISL22416UFU10Z-TK pinout, ISL22416UFU10Z-TK application, or ISL22416UFU10Z-TK equivalent, this device serves as a programmable resistor for calibration, gain/offset adjustment, sensor signal conditioning, and power supply feedback loop tuning - requiring attention to SPI timing, shutdown behavior, wiper register volatility, and non-volatile write cycle time.

Technical Context

The ISL22416UFU10Z-TK implements a monolithic CMOS resistor ladder with CMOS switch matrix, controlled via SPI Mode 0 (rising-edge clock-in, falling-edge clock-out). Its 7-bit volatile Wiper Register (WR) directly sets tap position, while the non-volatile Initial Value Register (IVR) stores power-up default.

Shutdown mode is activated either by pulling SHDN low or setting the SHDN bit in the Access Control Register (ACR), placing RH–RL in open-circuit and RW–RL in short-circuit. The device recalls IVR to WR on power-up after VPOR ≥ 2.0V, with tD = 3ms delay.

Key Specifications

Pinout & Package

ISL22416UFU10Z-TK uses a Pb-free 10-lead MSOP package (M10.118, 3.0mm × 3.0mm footprint, 0.5mm pitch), optimized for high-density PCB layouts and reflow compatibility with SnPb and Pb-free processes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL22416UFU10Z-TK, ISL22316WFU10Z-TK offers lower resistance and no shutdown capability, while AD5175BRMZ-50-RL7 provides double the resolution and I²C compatibility at the expense of SPI-native timing performance and shorter non-volatile endurance.

Availability

ISL22416UFU10Z-TK is available at Aetrix Electronics and suitable for industrial sensor calibration, laser diode biasing, audio level control, and programmable power supply feedback requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for ISL22416UFU10Z-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 maintains its precision analog portfolio, emphasizing high-reliability, extended-temperature ICs for industrial and automotive markets.

The ISL22416 series was designed as a drop-in upgrade to mechanical potentiometers in automated calibration systems, targeting applications demanding non-volatile memory, SPI configurability, and robust operation from −40°C to +125°C.

FAQ

What is the function of the SHDN pin on the ISL22416UFU10Z-TK?

The SHDN pin on the ISL22416UFU10Z-TK is an active-low hardware control that forces the DCP into shutdown mode: RH–RL becomes open-circuit and RW–RL is shorted. This occurs regardless of the SHDN bit in the ACR register, as both are logically ANDed. In shutdown, the SPI interface remains accessible, allowing register reads/writes, and the wiper returns to its pre-shutdown position upon exit. ISL22416UFU10Z-TK draws only 2–5µA in this state.

How does the ISL22416UFU10Z-TK handle power-up initialization?

At power-up, ISL22416UFU10Z-TK first resets the Wiper Register (WR) to 40h (64 decimal), placing the wiper near mid-scale. Once VCC exceeds VPOR (2.0–2.6V), it recalls the stored value from the non-volatile Initial Value Register (IVR) into WR - completing within 3ms. This ensures repeatable startup behavior without host intervention. The IVR itself retains data for 50 years at ≤+55°C.

Can the ISL22416UFU10Z-TK be used in rheostat mode?

Yes, ISL22416UFU10Z-TK supports two-terminal rheostat operation by connecting either RH or RL to RW and leaving the unused terminal unconnected. In this configuration, resistance between RW and the connected terminal varies from near-zero to 50kΩ. DNL is ±0.5 LSB and Roffset is ≤2 MI, ensuring monotonicity and predictable step response - validated in Figures 7 and 8 of the datasheet.

What SPI protocol mode does the ISL22416UFU10Z-TK use?

The ISL22416UFU10Z-TK uses SPI Mode 0: CPOL = 0 (clock idle low) and CPHA = 0 (data sampled on rising edge, changed on falling edge). Communication requires a valid 8-bit Identification Byte (01010000b), followed by an instruction byte (1011b for read, 1100b for write) and a data byte. All transfers are MSB-first, with CS held low throughout the three-byte sequence.

Is the ISL22416UFU10Z-TK pin-compatible with other ISL224xx variants?

ISL22416UFU10Z-TK shares the same 10-lead MSOP package and pinout with all ISL22416 variants (e.g., ISL22416WFU10Z-TK, ISL22416UFRT10Z-TK), differing only in resistance value (50kΩ vs 10kΩ) and package type (MSOP vs TDFN). However, it is not pin-compatible with ISL22316 or ISL225xx families due to differences in shutdown implementation, register mapping, and memory architecture.