Renesas ISL22346WFV20Z-TK

Overview

ISL22346WFV20Z-TK from Renesas Electronics (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 packaged in a 20-lead TSSOP for precision analog trimming in sensor signal conditioning and power supply feedback loops.

For engineers reviewing the ISL22346WFV20Z-TK datasheet, ISL22346WFV20Z-TK pinout, ISL22346WFV20Z-TK application, or ISL22346WFV20Z-TK equivalent, key selection criteria include I²C address configurability (A0–A2), wiper resistance (70 Ω typ. @ 3.3V), voltage divider linearity (±1 LSB INL), DCP-to-DCP matching (±2 LSB), and extended industrial temperature range (−40°C to +125°C).

Technical Context

The ISL22346WFV20Z-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 position is updated via I²C commands (slave address bits A2–A0), and power-up recalls IVR contents to WRs. The device implements "make-before-break" switching to prevent open-circuit glitches during tap transitions.

It supports dual operating modes: voltage divider (RH–RL–RW) and rheostat (RW–RL or RW–RH), with guaranteed monotonicity and ratiometric temperature coefficient of ±4 ppm/°C. Shutdown is activated either by logic-low SHDN pin or ACR register bit, placing all DCPs in high-impedance end-to-end open circuit while retaining I²C accessibility.

Key Specifications

Pinout & Package

Package: 20-lead TSSOP (M20.173), RoHS-compliant, Pb-free matte tin finish. Thermal pad not present (unlike TQFN variant); no thermal land required.

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/SL, the ISL22346WFV20Z-TK offers superior integration (quad channels), guaranteed non-volatile recall, lower wiper resistance, and I²C address flexibility-making it optimal for compact, self-initializing analog tuning in multi-sensor or multi-rail systems.

Availability

ISL22346WFV20Z-TK is available at Aetrix Electronics and suitable for motor control feedback, industrial sensor calibration, programmable power supplies, and audio signal processing requiring stable component supply across automotive, industrial, and test equipment programs.

Supply support for ISL22346WFV20Z-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, formed from the merger of NEC Electronics and Renesas Technology, is a global semiconductor leader delivering microcontrollers, analog, power, and SoC solutions for industrial, automotive, and infrastructure markets.

The ISL22346 series belongs to Renesas' precision analog portfolio, designed specifically for replacing mechanical potentiometers in digitally calibrated systems where reliability, non-volatility, and multi-channel integration are critical.

FAQ

What is the default wiper position of ISL22346WFV20Z-TK at power-up?

At initial power-on before non-volatile recall completes, all four wiper registers (WR0–WR3) reset to 0x40 (64 decimal), positioning each wiper at mid-scale. Once VCC exceeds Vpor (2.0–2.6 V), the device loads the stored IVR values into the corresponding WRs-so the actual startup position depends on the last written IVR contents. The ISL22346WFV20Z-TK guarantees this recall occurs within 3 ms after VCC stabilization.

Can ISL22346WFV20Z-TK operate with a 1.8 V I²C bus?

No. The ISL22346WFV20Z-TK requires VCC between 2.7 V and 5.5 V, and its I²C interface (SCL/SDA) is referenced to VCC-not a separate IOVDD. Input thresholds are defined as VIH ≥ 0.7×VCC and VIL ≤ 0.3×VCC, so at 1.8 V supply, the minimum VIH would be 1.26 V, exceeding standard 1.8 V logic-high levels (typically 0.7×VDD = 1.26 V, but timing and noise margins become marginal). The ISL22346WFV20Z-TK is not rated for 1.8 V operation.

How does shutdown mode affect the ISL22346WFV20Z-TK's DCP terminals?

In shutdown mode (activated by SHDN pin low or ACR[6] = 0), each DCP disconnects its RH terminal from the resistor string and shorts its RW terminal to RL-creating an open-circuit between RH and RL while grounding RW. This prevents current flow through the potentiometer and eliminates loading effects on external circuits. The ISL22346WFV20Z-TK maintains full I²C register access and retains all WR/IVR values during shutdown.

What is the maximum capacitive load the ISL22346WFV20Z-TK SDA/SCL lines can drive?

The ISL22346WFV20Z-TK specifies a maximum total bus capacitance (Cb) of 400 pF for reliable 400 kHz I²C operation. This includes PCB trace capacitance, package parasitics (~10 pF per pin), and any attached devices. For Cb = 400 pF, the recommended pull-up resistor is ~2–2.5 kΩ; for lower capacitance (e.g., 40 pF), pull-ups up to 20 kΩ are acceptable. Exceeding 400 pF risks violating tR/tF timing limits and causing communication failures.

Does ISL22346WFV20Z-TK support write-protection of non-volatile registers?

No. The ISL22346WFV20Z-TK does not implement hardware or software write-protection for its non-volatile Initial Value Registers (IVRs). Any I²C master with valid address and write access can overwrite IVR0–IVR3. Designers must implement system-level safeguards (e.g., firmware checksums, secure boot validation, or external EEPROM locking) if permanent calibration data integrity is required. The ISL22346WFV20Z-TK relies on procedural control rather than embedded protection.