Renesas ISL22317WFRTZ

Overview

ISL22317WFRTZ from Renesas (formerly Intersil) is a precision single digitally controlled potentiometer (XDCP™) with I²C interface, 128-tap resolution, 10kΩ end-to-end resistance, ±1% tolerance, and ±10ppm/°C end-to-end temperature coefficient matched to an external 0.5% reference resistor. It operates from 2.7V to 5.5V and supports voltage divider or rheostat modes for analog trimming in high-accuracy systems.

For engineers reviewing the ISL22317WFRTZ datasheet, ISL22317WFRTZ pinout, ISL22317WFRTZ application, or ISL22317WFRTZ equivalent, this device delivers 99% typical resistance accuracy across temperature, non-volatile wiper position storage (1M write cycles, 50-year retention at ≤+55°C), and low-noise, low-power operation in a 3mm×3mm TDFN package - critical for calibration, DC margining, and test instrumentation design.

Technical Context

The ISL22317WFRTZ implements a resistor ladder with CMOS switches in "make-before-break" switching mode, enabling monotonic wiper movement across 128 positions. Its volatile Wiper Register (WR) controls real-time resistance, while the non-volatile Initial Value Register (IVR) ensures power-up reproducibility.

It requires an external 10kΩ ±0.5% reference resistor connected between REF_A and REF_B to enable precision mode, which mirrors both resistance value and temperature coefficient (TC_Ref) of that reference. In precision-off mode, it functions as a standard DCP with ~40% higher nominal resistance and reduced accuracy.

Key Specifications

Pinout & Package

ISL22317WFRTZ is housed in a 10-lead 3mm×3mm Thin DFN (TDFN) package with 0.65mm pitch and exposed thermal pad (EPAD) internally connected to GND. The package is RoHS-compliant and Pb-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5170BRMZ-10 and MCP45HV51-103E/ST, the ISL22317WFRTZ uniquely provides ±1% resistance tolerance and ±10ppm/°C TC matched to an external reference - making it the only option among the three qualified for metrology-grade calibration where absolute resistance accuracy dominates over tap count or voltage range.

Availability

ISL22317WFRTZ is available at Aetrix Electronics and suitable for DC power supply calibration, LED backlight current control, and automated test equipment requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for ISL22317WFRTZ 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 full technical and manufacturing continuity for the ISL22317 family. Renesas is a global semiconductor leader focused on embedded processing, analog, power, and connectivity solutions.

The ISL22317 series was designed specifically for high-accuracy analog trimming in industrial, test & measurement, and power management systems where mechanical potentiometer replacement demands long-term stability, digital configurability, and non-volatile recall.

FAQ

What is the resistance tolerance and temperature coefficient of ISL22317WFRTZ?

The ISL22317WFRTZ has a total resistance tolerance of ±1% and an end-to-end temperature coefficient of ±10ppm/°C - but only when used with a 10kΩ ±0.5% external reference resistor connected between REF_A and REF_B. Without the reference, precision mode is disabled and accuracy degrades significantly.

Does ISL22317WFRTZ support both voltage divider and rheostat configurations?

Yes, ISL22317WFRTZ supports both modes via its Mode Select Register (MSR). In voltage divider mode (MSR<7> = 1), RH and RL form fixed terminals with RW as the wiper. In rheostat mode (MSR<7> = 0), RH is left unconnected and RW–RL functions as a two-terminal variable resistor - ideal for current-sense feedback paths.

How does ISL22317WFRTZ retain wiper position after power loss?

The ISL22317WFRTZ stores wiper position in a non-volatile Initial Value Register (IVR) with 1,000,000 write cycles endurance and 50-year data retention at ≤+55°C. At power-up, the IVR contents are automatically loaded into the volatile Wiper Register (WR), restoring the last programmed resistance value without host intervention.

What is the minimum external reference resistor requirement for ISL22317WFRTZ?

For ISL22317WFRTZ (W-option), a 10kΩ ±0.5% metal-film resistor must be connected between REF_A and REF_B to enable precision mode. Connecting REF_A to GND will damage the device. The reference resistor's own temperature coefficient directly determines the system-level TC performance.

Can multiple ISL22317WFRTZ devices share the same I²C bus?

Yes, up to two ISL22317WFRTZ devices can share one I²C bus using pin-selectable addresses: A1 = low → address 0x50; A1 = high → address 0x54. No additional address pins or configuration registers are needed - simplifying multi-channel calibration architectures.