Renesas ISL90841WIV1427Z-TK

Overview

ISL90841WIV1427Z-TK from Intersil is a quad digitally controlled potentiometer (XDCP™) IC with I²C interface, 10kΩ total resistance per channel, 256-tap resolution, and 14-lead TSSOP package. It operates from 2.7V to 5.5V, draws <5µA standby current, and functions as voltage dividers or rheostats in precision analog control circuits.

For engineers reviewing the ISL90841WIV1427Z-TK datasheet, ISL90841WIV1427Z-TK pinout, ISL90841WIV1427Z-TK application, or ISL90841WIV1427Z-TK equivalent, key selection criteria include wiper resistance (70Ω typ), DCP-to-DCP matching (±2 LSB), ratiometric tempco (±4 ppm/°C), and I²C timing compliance at 400kHz.

Technical Context

The ISL90841WIV1427Z-TK integrates four independent CMOS-switched resistor ladders, each with an 8-bit volatile wiper register (WR) directly accessible via I²C. All RH terminals connect to VCC or external bias; all RW terminals serve as adjustable output nodes; all low terminals are internally tied to GND.

I²C communication uses a 7-bit slave address formed by A1/A0 pins and fixed prefix 01010, supporting write/read sequences with ACK handshaking. Power-up resets all WRs to 0x80 (mid-scale), and wiper response time is 1µs after SCL falling edge of final data byte.

Key Specifications

Pinout & Package

14-lead TSSOP (Package Code V14), RoHS-compliant Pb-free plus anneal finish, 0.65mm pitch, 5.0mm × 4.4mm body size.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5242BRUZ10 and MCP4018T-E/OT, the ISL90841WIV1427Z-TK uniquely delivers quad integration with guaranteed ±2 LSB DCP matching and ±4 ppm/°C ratiometric tempco-critical for multi-channel calibration systems requiring correlated drift performance.

Availability

ISL90841WIV1427Z-TK is available at Aetrix Electronics and suitable for industrial sensor calibration, audio equipment manufacturing, laser diode biasing, and programmable filter design requiring stable component supply and long-term obsolescence management.

Supply support for ISL90841WIV1427Z-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

Intersil Corporation (now part of Renesas Electronics) designs high-performance analog and mixed-signal ICs for power management, precision analog, and interface applications.

The ISL90841WIV1427Z-TK belongs to Intersil's XDCP™ family of digitally controlled potentiometers, engineered for replacing mechanical trimmers in automated test equipment, medical instrumentation, and industrial control systems demanding repeatable, drift-resistant analog adjustment.

FAQ

What is the total resistance value specified for the ISL90841WIV1427Z-TK?

The ISL90841WIV1427Z-TK is configured for 10kΩ total resistance per digitally controlled potentiometer (DCP), as indicated by the "W" in the part number per Intersil's ordering information. This value is factory-trimmed and specified with ±20% tolerance over temperature. The resistance appears between each RH pin and GND, and determines the full-scale range when used in voltage divider or rheostat mode.

Does the ISL90841WIV1427Z-TK support true 4-wire potentiometer connections?

No, the ISL90841WIV1427Z-TK does not support true 4-wire (Kelvin) connections. Each DCP has only three accessible terminals: RH (high), RW (wiper), and GND (low, internally tied). The low terminal is not brought out separately, so independent force-and-sense capability is unavailable. For precision applications requiring minimal wiper resistance impact, the 70Ω typical wiper resistance and ±2 LSB DCP matching provide best-in-class performance within its 3-terminal architecture.

How is the I²C address configured for the ISL90841WIV1427Z-TK?

The ISL90841WIV1427Z-TK uses a 7-bit I²C slave address formed by the fixed prefix "01010" followed by the logic states of pins A1 (MSB) and A0 (LSB), and the R/W bit. This yields four possible addresses: 0x28 (A1=0, A0=0), 0x29 (A1=0, A0=1), 0x2A (A1=1, A0=0), and 0x2B (A1=1, A0=1). The ISL90841WIV1427Z-TK datasheet confirms this mapping in Table 1 and Figure 17, enabling up to four devices on the same bus without address conflict.

What happens to the wiper positions of the ISL90841WIV1427Z-TK during power-up?

During power-up, all four wiper registers (WR0–WR3) of the ISL90841WIV1427Z-TK reset to 0x80 (decimal 128), positioning each wiper at approximately mid-scale between GND and RH. This deterministic startup state ensures predictable initial output voltages across all channels before host MCU initialization. The registers remain volatile and retain their last-written values only while powered; they do not retain settings across power cycles unless externally managed by the host controller.

Can the ISL90841WIV1427Z-TK be used in rheostat mode with the RH pin grounded?

No, the ISL90841WIV1427Z-TK is not designed for RH-to-GND rheostat configuration. Its internal architecture ties the low terminal of each DCP permanently to GND; the RH pin is intended as the high-side reference (typically connected to VCC or an external voltage). Using RH as the low-side violates the absolute maximum rating for voltage at DCP pins (–0.3V to VCC) and risks latch-up or parametric shift. Valid rheostat operation requires RW and RH terminals only, with GND serving as the fixed low reference.