Renesas ISL22346WFRT20Z-TK

Overview

ISL22346WFRT20Z-TK 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 voltage divider or rheostat in analog signal conditioning circuits.

For engineers reviewing the ISL22346WFRT20Z-TK datasheet, ISL22346WFRT20Z-TK pinout, ISL22346WFRT20Z-TK application, or ISL22346WFRT20Z-TK equivalent, key selection considerations include I²C address configurability (A0–A2), wiper resistance (70 Ω typ. @ 3.3 V), ratiometric temperature coefficient (±4 ppm/°C), DCP-to-DCP matching (±2 LSB), and shutdown timing (1.5 µs recall).

Technical Context

The ISL22346WFRT20Z-TK integrates four independent 128-tap DCPs on a monolithic CMOS die, each with volatile Wiper Register (WR) and non-volatile Initial Value Register (IVR). Wiper positioning is controlled via I²C commands using 7-bit slave address with three hardware-selectable bits (A0–A2), enabling up to eight devices per bus.

Each DCP functions either as a three-terminal voltage divider (RH–RW–RL) or two-terminal variable resistor (RW–RL or RW–RH). The device implements "make-before-break" switching, ensures monotonicity (DNL ±0.5 LSB), and recalls IVR values at power-up after V_POR ≥ 2.6 V. Shutdown mode disconnects RH terminals and shorts RW to RL while preserving register access over I²C.

Key Specifications

Pinout & Package

ISL22346WFRT20Z-TK uses a 20-lead 4×4 mm TQFN package (RoHS-compliant, exposed pad connected to GND). Pin numbering follows top-view orientation with pin 1 at bottom-left corner adjacent to notch or mark.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5242BRUZ10 and MCP42010-I/P, the ISL22346WFRT20Z-TK uniquely delivers quad-channel integration, hardware shutdown, and guaranteed power-up recall in a compact TQFN-reducing system-level complexity and firmware overhead in multi-parameter analog tuning systems.

Availability

ISL22346WFRT20Z-TK is available at Aetrix Electronics and suitable for laser diode bias control, programmable gain amplifiers, audio channel balancing, and ADC reference trimming requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ISL22346WFRT20Z-TK 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 applications.

The ISL22346WFRT20Z-TK belongs to Renesas' XDCP™ digitally controlled potentiometer family, designed specifically for replacing mechanical trimmers in high-reliability analog tuning applications where programmability, non-volatility, and multi-channel integration are critical.

FAQ

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

The ISL22346WFRT20Z-TK supports standard-mode Fast-mode I²C operation up to 400 kHz. This is confirmed in the Absolute Maximum Ratings and Serial Interface Specifications sections of the FN6177 datasheet. The timing parameters-including t_LOW, t_HIGH, and t_AA-are fully characterized at this frequency, ensuring reliable communication with common microcontroller I²C peripherals without additional timing margin analysis.

Does the ISL22346WFRT20Z-TK retain its wiper position after power loss?

Yes, the ISL22346WFRT20Z-TK retains wiper position after power loss via its non-volatile Initial Value Registers (IVRs). At power-up, the device automatically recalls stored IVR values into the corresponding volatile Wiper Registers (WRs), restoring all four DCPs to their last-saved positions. This behavior is guaranteed across the full -40°C to +125°C operating range and supported by 50-year data retention at T < +55°C.

Can the ISL22346WFRT20Z-TK operate from a 2.7 V supply?

Yes, the ISL22346WFRT20Z-TK is fully specified to operate from 2.7 V to 5.5 V. Key parameters-including ICC1 (0.5 mA), wiper resistance (70 Ω typ.), and I²C logic thresholds-are validated across this entire range. The V_POR threshold (2.0–2.6 V) ensures reliable power-on recall even during brownout conditions near the lower supply limit.

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

Up to eight ISL22346WFRT20Z-TK devices can share one I²C bus. This is enabled by three hardware-configurable address pins (A0, A1, A2), which set the three LSBs of the 7-bit slave address (base 1010xxx). Each unique combination of A0–A2 yields a distinct address, allowing individual addressing without software address remapping or bus isolation.

What is the purpose of the SHDN pin on the ISL22346WFRT20Z-TK?

The SHDN pin on the ISL22346WFRT20Z-TK is an active-low hardware control that forces all four DCPs into shutdown mode: RH terminals become open-circuit and RW terminals are shorted to RL terminals. This reduces system leakage and eliminates unintended signal paths. Crucially, the I²C interface remains fully accessible during shutdown, enabling register reads/writes without exiting the low-power state.