Renesas ISL22416UFU10Z

Overview

ISL22416UFU10Z 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 50 kΩ end-to-end resistance. It operates from 2.7V to 5.5V, features 70 Ω typical wiper resistance at 3.3V, and supports voltage divider or rheostat configurations in precision analog trimming applications.

For engineers reviewing the ISL22416UFU10Z datasheet, ISL22416UFU10Z pinout, ISL22416UFU10Z application, or ISL22416UFU10Z equivalent, this device delivers deterministic wiper positioning, power-up recall of stored settings, low-noise analog control, and shutdown mode with ≤5 µA standby current - critical for embedded sensor calibration, programmable gain stages, and industrial DAC offset adjustment.

Technical Context

The ISL22416UFU10Z implements a monolithic CMOS resistor ladder with CMOS switch matrix, enabling precise 7-bit (0–127 decimal) wiper positioning via SPI Mode 0 interface. Its volatile Wiper Register (WR) controls real-time resistance division, while the non-volatile Initial Value Register (IVR) ensures consistent power-on behavior without external EEPROM.

Shutdown mode disconnects RH from the array and shorts RW to RL, reducing supply current to ≤5 µA at +85°C. The device supports both voltage-divider and two-terminal rheostat operation, with monotonic DNL ≤ ±0.5 LSB and INL ≤ ±1 LSB across full temperature range (−40°C to +125°C).

Key Specifications

Pinout & Package

ISL22416UFU10Z is housed in a Pb-free 10-lead MSOP package (M10.118, JEDEC MO-187BA), measuring 3.0 mm × 3.0 mm × 1.0 mm, with exposed pad not electrically connected. Pin functions are validated per FN6227 Rev 2.00 datasheet.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL22416UFU10Z, ISL22316WFU10Z offers lower resistance and tighter tolerance but sacrifices shutdown capability and increases wiper resistance; AD5175BRMZ-50 provides higher resolution and lower wiper resistance but replaces hardware shutdown with software-only control and changes interface protocol.

Availability

ISL22416UFU10Z is available at Aetrix Electronics and suitable for industrial sensor calibration, programmable gain amplifier design, and laser diode bias control requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ISL22416UFU10Z 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, automotive-qualified, and industrial-grade mixed-signal components.

The ISL22416UFU10Z belongs to the 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 ISL22416UFU10Z?

The ISL22416UFU10Z has a nominal total resistance of 50 kΩ between RH and RL terminals, with a tolerance of ±20% over temperature and process variation. This value is fixed per the UFU10Z ordering suffix and is verified during production test at +25°C. The resistance remains stable across −40°C to +125°C with an end-to-end temperature coefficient of ±80 ppm/°C, making it suitable for precision analog applications where predictable scaling is essential.

How does the ISL22416UFU10Z handle power-up initialization?

At power-up, the ISL22416UFU10Z recalls the contents of its non-volatile Initial Value Register (IVR) into the volatile Wiper Register (WR), placing the wiper at the last-stored position. This occurs after VCC exceeds VPOR (2.0–2.6 V) and completes within 3 ms. If IVR has never been written, WR defaults to 40h (64 decimal), centering the wiper. This behavior ensures repeatable startup without host intervention, critical for unattended instrumentation systems.

Can the ISL22416UFU10Z operate in both voltage-divider and rheostat modes?

Yes, the ISL22416UFU10Z supports both configurations. In voltage-divider mode, RH and RL connect to fixed voltages (e.g., VCC and GND), and RW provides a programmable tap point. In rheostat mode, either RH or RL is left floating while RW and the other terminal form a two-terminal variable resistor. The device maintains monotonicity and specified DNL/INL in both modes, enabling flexible use in gain control, offset adjustment, and current limiting circuits.

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

The SHDN pin on the ISL22416UFU10Z is an active-low hardware control that forces the DCP into shutdown mode: RH is disconnected from the resistor ladder, and RW is shorted to RL. This reduces VCC current to ≤5 µA at +85°C. Shutdown can also be triggered via the SHDN bit in the Access Control Register (ACR), and both controls are logically ANDed. SPI communication remains functional during shutdown, allowing register access without waking the DCP array.

Does the ISL22416UFU10Z require an external pull-up resistor on the SDO pin?

Yes, the ISL22416UFU10Z SDO pin is open-drain and requires an external pull-up resistor for proper SPI read operation. The datasheet specifies a maximum value of 2 kΩ when operating at 5 MHz with 30 pF bus capacitance. Lower clock frequencies allow higher pull-up values, but exceeding 2 kΩ at full speed may violate tRO/tFO rise/fall time specs (60 ns max). A 1.8 kΩ resistor is commonly used to ensure robust timing margin across voltage and temperature.