Renesas ISL22316WFU10Z

Overview

ISL22316WFU10Z from Renesas (formerly Intersil) is a single-channel digitally controlled potentiometer (XDCP™) with I²C interface, 128-tap resolution, non-volatile wiper storage, and 10 kΩ end-to-end resistance. It operates from 2.7V to 5.5V, delivers 70 Ω typical wiper resistance at 3.3V, and supports shutdown mode with ≤5 µA current. It serves as a precision programmable resistor in analog signal conditioning circuits for industrial sensor calibration and power supply feedback loops.

For engineers reviewing the ISL22316WFU10Z datasheet, ISL22316WFU10Z pinout, ISL22316WFU10Z application, or ISL22316WFU10Z equivalent, this page provides verified technical context, validated pin functions, real-world use cases, and confirmed alternative parts - all grounded in the FN6186 Rev 3.00 datasheet and Renesas product documentation.

Technical Context

The ISL22316WFU10Z implements a monolithic CMOS DCP using resistor ladder and CMOS switches in "make-before-break" switching mode. Its 7-bit volatile Wiper Register (WR) controls tap position, while the non-volatile Initial Value Register (IVR) retains the last wiper setting across power cycles. At power-up, IVR contents are automatically loaded into WR.

It features dual-mode operation: voltage divider (RH–RL–RW) and rheostat (RW–RL or RW–RH), with monotonic ±0.5 LSB DNL and ±1 LSB INL in both modes. The I²C interface supports up to 400 kHz clock rate, two address pins (A0/A1), and open-drain SDA/SCL with external pull-ups.

Key Specifications

Pinout & Package

ISL22316WFU10Z is housed in a Pb-free 10-lead MSOP package (M10.118), with exposed pad not electrically connected. Pin functions are identical between MSOP and TDFN variants per datasheet Figure 1 and Pin Descriptions table.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL22316WFU10Z, AD5171BRMZ10 offers 8× more taps but sacrifices I²C compatibility and 5 V operation, while MCP45HV51-103E/MS supports higher DCP voltages but increases wiper error and removes hardware shutdown - making ISL22316WFU10Z optimal for robust, low-glitch, I²C-based 3.3/5 V industrial trimming.

Availability

ISL22316WFU10Z is available at Aetrix Electronics and suitable for industrial sensor calibration, programmable power supply feedback, laser diode bias control, and audio tone/volume adjustment requiring stable component supply across extended temperature ranges.

Supply support for ISL22316WFU10Z 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) designs high-reliability analog and power management ICs for industrial, automotive, and infrastructure markets, with ISO 9001-certified manufacturing.

The ISL22316WFU10Z belongs to Renesas' XDCP™ digitally controlled potentiometer family, engineered for precision analog trimming in harsh environments where mechanical potentiometers fail due to vibration, contamination, or wear.

FAQ

What is the total resistance and tolerance of the ISL22316WFU10Z?

The ISL22316WFU10Z has a nominal total resistance of 10 kΩ with a tolerance of ±20% across temperature and unit variation. This value is specified in the Analog Specifications table on page 3 of FN6186 Rev 3.00, and applies to the RH-to-RL terminal resistance under recommended operating conditions. The part marking "W" in ISL22316WFU10Z explicitly denotes the 10 kΩ option.

Does the ISL22316WFU10Z retain its wiper position after power loss?

Yes, the ISL22316WFU10Z retains its last wiper position in non-volatile memory. Upon power-up, the device automatically recalls the stored value from the Initial Value Register (IVR) into the volatile Wiper Register (WR), restoring the previous setting. This behavior is documented in the "Principles of Operation" section (page 10) and confirmed by the "Power-on Recall Voltage" spec (Vpor = 2.0–2.6 V).

What is the maximum I²C clock frequency supported by the ISL22316WFU10Z?

The ISL22316WFU10Z supports standard-mode I²C up to 400 kHz, as specified in the Serial Interface Specifications table (page 5). This allows fast register writes and reads while maintaining compatibility with most microcontrollers and FPGAs. Timing parameters including tLOW (1300 ns), tHIGH (600 ns), and tSU:STA (600 ns) are all defined for this frequency.

Can the ISL22316WFU10Z be used in rheostat (two-terminal) mode?

Yes, the ISL22316WFU10Z supports rheostat mode by connecting only RW and RL (or RW and RH), leaving the unused terminal floating. The datasheet confirms monotonic performance in this configuration, with RINL ≤ ±1 MI and RDNL ≤ ±1 MI for the 10 kΩ variant. This mode is commonly used for programmable current limiting or gain control.

What is the wiper resistance of the ISL22316WFU10Z and why does it matter?

The ISL22316WFU10Z has a typical wiper resistance of 70 Ω at VCC = 3.3 V, with a maximum of 200 Ω. This parameter directly impacts insertion error in voltage divider configurations - lower wiper resistance minimizes deviation from ideal divider behavior, especially when driving low-impedance loads like op-amp inputs or ADC references.