Renesas ISL22346WFRT20Z

Overview

ISL22346WFRT20Z from Renesas (formerly Intersil) is a quad digitally controlled potentiometer (XDCP™) with I²C interface, 128-tap resolution, 10 kΩ end-to-end resistance, and non-volatile wiper position storage. It operates from 2.7V to 5.5V, supports shutdown mode (≤5 µA), and is housed in a 20-lead 4×4 mm TQFN package. It serves as precision programmable gain/offset adjustment in analog front-ends and sensor calibration circuits.

For engineers reviewing the ISL22346WFRT20Z datasheet, ISL22346WFRT20Z pinout, ISL22346WFRT20Z application, or ISL22346WFRT20Z equivalent, key selection criteria include I²C address flexibility (3-pin configuration), wiper resistance (70 Ω typ.), monotonicity (±0.5 LSB DNL), ratiometric temperature coefficient (±4 ppm/°C), and guaranteed operation across –40°C to +125°C.

Technical Context

The ISL22346WFRT20Z implements four independent resistor arrays using CMOS-switched ladder networks, each with volatile Wiper Registers (WR) and non-volatile Initial Value Registers (IVR). Wiper movement follows "make-before-break" switching to prevent open-circuit glitches during tap transitions.

Its I²C interface supports standard-mode (400 kHz) operation with three address pins (A0–A2), enabling up to eight devices on one bus. Shutdown is controlled either via dedicated SHDN pin (active-low) or ACR register bit, placing all DCPs into high-impedance RH–RL open state while retaining register accessibility.

Key Specifications

Pinout & Package

ISL22346WFRT20Z uses a 20-lead 4×4 mm TQFN package (RoHS-compliant, exposed pad internally connected to GND). Pin numbering follows top-view layout with EPAD centered on underside.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5242BRUZ10 and MCP45HV51-103E/ST, the ISL22346WFRT20Z uniquely delivers quad-channel integration, guaranteed non-volatile recall, and a dedicated shutdown pin in a compact TQFN - making it optimal for space-constrained, multi-sensor systems requiring deterministic power-on behavior.

Availability

ISL22346WFRT20Z is available at Aetrix Electronics and suitable for industrial sensor calibration, automotive climate control, medical instrumentation gain staging, and test equipment offset trimming requiring stable component supply across extended temperature ranges.

Supply support for ISL22346WFRT20Z 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 is a global semiconductor leader delivering microcontrollers, analog power, and SoC solutions for automotive, industrial, and IoT markets.

The ISL22346WFRT20Z belongs to Renesas' XDCP™ family of digitally controlled potentiometers, designed specifically for replacing mechanical trimpots in high-reliability, programmable analog signal conditioning applications.

FAQ

What is the maximum I²C clock frequency supported by the ISL22346WFRT20Z?

The ISL22346WFRT20Z supports standard-mode I²C operation up to 400 kHz, as specified in its serial interface timing table. This allows direct interfacing with most microcontrollers without requiring clock stretching or custom bit-banging firmware. The device meets all setup/hold time requirements at this rate, including tSU:STA (600 ns) and tLOW (1300 ns), ensuring robust communication in noisy industrial environments.

Does the ISL22346WFRT20Z retain wiper settings after power cycling?

Yes, the ISL22346WFRT20Z retains wiper positions in non-volatile Initial Value Registers (IVRs). At power-up, the device automatically recalls the stored IVR values into the corresponding volatile Wiper Registers (WRs), restoring the last programmed tap positions. This recall occurs within 3 ms after VCC exceeds 2.0 V, ensuring deterministic startup behavior without host intervention.

Can the ISL22346WFRT20Z be used in rheostat mode (two-terminal configuration)?

Yes, the ISL22346WFRT20Z supports both three-terminal potentiometer and two-terminal rheostat configurations. In rheostat mode, either RH or RL is left unconnected while RW and the other terminal form a variable resistor. Its datasheet specifies monotonicity (±1 MI INL), offset (0–5 MI), and matching (±2 MI) under this configuration - confirming suitability for precision current-setting and bias adjustment applications.

What is the wiper resistance specification for the ISL22346WFRT20Z and why does it matter?

The ISL22346WFRT20Z has a typical wiper resistance of 70 Ω at VCC = 3.3 V. This low on-resistance minimizes insertion loss and voltage error when the wiper drives high-impedance loads (e.g., op-amp inputs), and reduces thermal noise contribution in sensitive analog paths. It remains stable across temperature and supply voltage, directly impacting gain accuracy in programmable amplifier designs using the device.

How many devices can share the same I²C bus with the ISL22346WFRT20Z?

Up to eight ISL22346WFRT20Z devices can operate on a single I²C bus. This is enabled by three hardware address pins (A0, A1, A2), each configurable as logic high or low to set unique 3-bit slave addresses. The full 7-bit address format begins with '1010', followed by these bits and the R/W bit - eliminating software address conflicts and simplifying multi-channel system design.