Renesas ISL22346WFV20Z

Overview

ISL22346WFV20Z 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 and supports industrial temperature range (–40°C to +125°C), enabling precise analog parameter tuning in programmable gain amplifiers, sensor calibration circuits, and DC-DC feedback networks.

For engineers reviewing the ISL22346WFV20Z datasheet, ISL22346WFV20Z pinout, ISL22346WFV20Z application, or ISL22346WFV20Z equivalent, key selection considerations include its TSSOP-20 package, 70 Ω typical wiper resistance at 3.3 V, shutdown current ≤5 µA, ±50 ppm/°C end-to-end tempco (W option), and I²C address flexibility via A0–A2 pins for multi-device bus configurations.

Technical Context

The ISL22346WFV20Z integrates four independent DCPs on a monolithic CMOS die, each with volatile Wiper Register (WR) and non-volatile Initial Value Register (IVR). Wiper positioning is controlled exclusively via I²C commands; power-up recalls IVR contents into corresponding WRs, ensuring repeatable startup states.

Each DCP functions as either a three-terminal voltage divider or two-terminal rheostat. Its "make-before-break" switching architecture prevents open-circuit glitches during tap transitions, and the SHDN pin (active-low) forces RH–RW open and RW–RL shorted while preserving register accessibility over I²C.

Key Specifications

Pinout & Package

ISL22346WFV20Z is housed in a Pb-free, RoHS-compliant 20-lead TSSOP package (M20.173 drawing), with exposed pad internally connected to GND. Pin numbering follows standard top-view orientation.

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 ISL22346WFV20Z uniquely delivers quad-channel density, integrated shutdown, and factory-retained non-volatile settings in a single I²C-compatible device-reducing component count and firmware complexity in multi-parameter calibration systems.

Availability

ISL22346WFV20Z is available at Aetrix Electronics and suitable for programmable gain amplifiers, sensor calibration circuits, DC-DC feedback networks, LED current regulation, and industrial process control systems requiring stable component supply across extended temperature ranges.

Supply support for ISL22346WFV20Z 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 products for automotive, industrial, and IoT applications.

The ISL22346 series was designed specifically for high-reliability, digitally programmable analog trimming in harsh environments-emphasizing non-volatile retention, wide temperature operation, and glitch-free wiper transitions.

FAQ

What is the resistance tolerance of ISL22346WFV20Z?

The ISL22346WFV20Z has a total resistance tolerance of ±20% across the 10 kΩ nominal value. This specification applies to the end-to-end resistance (RH to RL) over the full operating temperature range and ensures predictable scaling in voltage divider and rheostat configurations without requiring post-manufacture calibration.

Does ISL22346WFV20Z support write protection for non-volatile registers?

Yes, ISL22346WFV20Z implements hardware-level write protection: non-volatile writes to IVR registers require both the VOL bit in the Access Control Register (ACR) to be cleared (0) and a valid STOP condition to initiate the internal 12–20 ms self-timed write cycle. The WIP bit (ACR[5]) reads back '1' during this period, blocking concurrent register access.

Can ISL22346WFV20Z operate with a 1.8 V I²C bus?

No, ISL22346WFV20Z does not support 1.8 V I²C signaling. Its SDA and SCL pins require VIH ≥ 0.7×VCC and VIL ≤ 0.3×VCC, and minimum VCC is 2.7 V. For 1.8 V systems, level-shifting circuitry or a different DCP family (e.g., AD5170) is required to maintain compatible logic thresholds.

How does shutdown mode affect the wiper position in ISL22346WFV20Z?

In shutdown mode (SHDN pin low or ACR[6] = 0), ISL22346WFV20Z opens the RH–RW connection and shorts RW to RL for all four DCPs-but retains the last programmed wiper register (WR) values. Upon exit from shutdown, the wipers immediately return to their pre-shutdown positions without requiring reinitialization.

What is the maximum capacitive load supported on the I²C bus for ISL22346WFV20Z?

The ISL22346WFV20Z supports a total SDA/SCL bus capacitance (Cb) of up to 400 pF, as specified in the timing table. With 400 pF loading, the recommended pull-up resistor value is approximately 2–2.5 kΩ to meet rise/fall time requirements (tR/tF ≤ 250 ns) at 400 kHz operation.