Renesas ISL22316UFRT10Z

Overview

ISL22316UFRT10Z from Renesas (formerly Intersil) is a single-channel digitally controlled potentiometer (XDCP™) with I²C interface, 128-tap resolution, non-volatile wiper position storage, and 50kΩ end-to-end resistance in a 10-lead 3×3mm TDFN package. It operates from 2.7V to 5.5V, supports -40°C to +125°C, and delivers 70Ω typical wiper resistance at 3.3V - used for precision analog trimming in industrial sensor signal conditioning circuits.

For engineers reviewing the ISL22316UFRT10Z datasheet, ISL22316UFRT10Z pinout, ISL22316UFRT10Z application, or ISL22316UFRT10Z equivalent, key selection criteria include I²C address configurability (A0/A1), shutdown mode current (<5µA), ratiometric temperature coefficient (±4ppm/°C), and compatibility with high-reliability embedded systems requiring 50-year data retention and 1M-cycle endurance.

Technical Context

The ISL22316UFRT10Z implements a monolithic CMOS resistor ladder with CMOS switch-based wiper control, supporting both three-terminal potentiometer and two-terminal rheostat configurations. Its volatile Wiper Register (WR) and non-volatile Initial Value Register (IVR) enable power-up recall of last-set position without external memory.

I²C communication uses open-drain SDA/SCL with programmable slave address (via A0/A1), 400kHz max clock, and integrated access control logic. Shutdown mode disconnects RH–RL and shorts RW–RL while preserving register accessibility via I²C - enabling low-power system-level control without interrupting bus communication.

Key Specifications

Pinout & Package

ISL22316UFRT10Z is housed in a RoHS-compliant 10-lead 3×3mm TDFN package (PKG DWG L10.3x3B) with exposed thermal pad. Pin numbering follows top-view orientation with pin 1 at bottom-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5175BRMZ-50 and MCP45HV51-503E/MS, ISL22316UFRT10Z uniquely combines hardware shutdown, guaranteed non-volatile recall, and 50kΩ tolerance stability across -40°C to +125°C - making it optimal for unattended industrial nodes where power cycling and thermal stress are routine.

Availability

ISL22316UFRT10Z is available at Aetrix Electronics and suitable for industrial sensor calibration, programmable gain amplifiers, medical instrumentation biasing, and automotive climate control systems requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for ISL22316UFRT10Z 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 (acquired Intersil in 2017) is a global leader in microcontrollers, analog, and power management ICs, serving industrial, automotive, and infrastructure markets with high-reliability semiconductor solutions.

The ISL22316UFRT10Z belongs to Renesas' XDCP™ (eXternally Digital Controlled Potentiometer) family, designed specifically for replacing mechanical trimpots in harsh-environment applications demanding long-term stability, programmability, and zero-maintenance calibration.

FAQ

What is the default wiper position after power-up for the ISL22316UFRT10Z?

At initial power-on, the ISL22316UFRT10Z loads 0x40 (64 decimal) into its volatile Wiper Register (WR), placing the wiper at mid-scale (50% of 50kΩ). Within 3ms, it recalls the stored value from the non-volatile Initial Value Register (IVR) to overwrite WR - ensuring repeatable startup position even after battery removal or extended storage.

Does the ISL22316UFRT10Z support I²C clock stretching or multi-master arbitration?

No, the ISL22316UFRT10Z does not implement clock stretching or multi-master arbitration. It operates strictly as an I²C slave device with fixed 400kHz maximum SCL frequency. The device acknowledges each byte but does not hold SCL low - requiring the master to manage timing compliance per standard I²C protocol (tLOW ≥1300ns, tHIGH ≥600ns).

Can the ISL22316UFRT10Z be used in rheostat mode with only two terminals connected?

Yes, the ISL22316UFRT10Z supports true two-terminal rheostat operation: connect RH to the signal source and RW to the load (leaving RL unconnected), or connect RL to ground and RW to the load (leaving RH unconnected). In either configuration, resistance between RW and the connected terminal varies from ~70Ω to 50kΩ with monotonic 128-step control.

What is the maximum allowable voltage across the DCP terminals (RH–RL) for the ISL22316UFRT10Z?

The absolute maximum voltage across RH–RL is limited to VCC (max +6V), with recommended operating conditions specifying ≤5.5V. Exceeding VCC risks damaging the internal CMOS switches - especially during wiper transitions. For AC-coupled signals, ensure peak-to-peak voltage stays within 0V to VCC to prevent latch-up or leakage current increase.

How does the SHDN pin interact with the SHDN bit in the Access Control Register?

The SHDN pin and SHDN bit in the ACR register operate as a logical AND: shutdown activates only when both are asserted (pin = LOW AND bit = 0). This dual-control allows flexible system-level power management - e.g., hardware emergency shutdown via pin override, while software retains ability to disable shutdown for diagnostics via ACR writes.