Renesas ISL23425WFVZ-TK

Overview

ISL23425WFVZ-TK from Renesas Electronics (formerly Intersil) is a dual, volatile, 256-tap digitally controlled potentiometer (DCP) with SPI interface, 10kΩ total resistance, 1.7V–5.5V analog supply (VCC), and independent 1.2V–5.5V logic supply (VLOGIC). It delivers 70Ω typical wiper resistance at 3.3V and operates across –40°C to +125°C for trimming sensor circuits and gain adjustment in battery-powered instruments.

For engineers reviewing the ISL23425WFVZ-TK datasheet, ISL23425WFVZ-TK pinout, ISL23425WFVZ-TK application, or ISL23425WFVZ-TK equivalent, key selection considerations include its dual-channel architecture, mid-scale power-on reset, shutdown mode with end-to-end open circuit, low standby current (1.2µA at 1.7V/1.2V), and TSSOP-14 package compatibility with space-constrained industrial designs.

Technical Context

The ISL23425WFVZ-TK integrates two independent DCP cores on a monolithic CMOS IC, each with an 8-bit volatile wiper register (WR0/WR1) directly accessible via SPI Mode 0. Wiper positioning uses make-before-break switching, ensuring monotonic resistance transitions between RH, RW, and RL terminals.

It supports daisy-chained SPI configurations and features VLOGIC-independent bus operation down to 1.2V - eliminating level shifters when interfacing with low-voltage microcontrollers. Shutdown mode disconnects resistor arrays while preserving WR register contents, enabling rapid reactivation with <1.5µs recall time.

Key Specifications

Pinout & Package

ISL23425WFVZ-TK is housed in a Pb-free, RoHS-compliant 14-lead TSSOP package (M14.173), optimized for automated assembly and thermal performance (θJA = 112°C/W).

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 ISL23425WFVZ-TK uniquely combines dual-channel operation, 1.2V logic compatibility, shutdown isolation, and –40°C to +125°C qualification - making it the only option for compact, battery-efficient, high-reliability industrial sensor and power management designs.

Availability

ISL23425WFVZ-TK is available at Aetrix Electronics and suitable for power supply margining, trimming sensor circuits, gain adjustment in battery powered instruments, RF power amplifier bias compensation, and industrial embedded control requiring stable component supply across extended temperature ranges.

Supply support for ISL23425WFVZ-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 trusted embedded design innovation through high-performance, reliable analog and mixed-signal solutions.

The ISL23425WFVZ-TK belongs to Renesas' XDCP™ (eXternally Digitally Controlled Potentiometer) product line, engineered specifically for precision analog trimming, calibration, and bias control in harsh-environment industrial, automotive, and portable electronics.

FAQ

What is the default wiper position of the ISL23425WFVZ-TK at power-up?

The ISL23425WFVZ-TK powers up with both wiper registers (WR0 and WR1) preset to 0x80 (128 decimal), placing each wiper at mid-scale - i.e., 50% of total resistance between RH and RL terminals. This ensures predictable, safe startup behavior in amplifier gain and sensor offset circuits without requiring initialization firmware.

Does the ISL23425WFVZ-TK support daisy-chaining multiple devices on a single SPI bus?

Yes, the ISL23425WFVZ-TK supports daisy-chaining via its SPI interface. The SDO output can drive the SDI input of the next device in the chain, allowing sequential configuration of multiple DCPs using a single chip select (CS) line and shared SCK/SDI signals - reducing GPIO usage in multi-channel calibration systems.

What is the maximum SPI clock frequency supported by the ISL23425WFVZ-TK?

The ISL23425WFVZ-TK supports up to 5MHz SCK frequency when VLOGIC ≥ 1.7V. At lower logic supplies (1.2V–1.6V), the maximum clock rate is reduced to 1MHz to ensure reliable timing margins. All timing parameters - including tSU, tH, tWH, and tWL - are specified and guaranteed across this range.

How does the shutdown mode affect the wiper registers and DCP terminals in the ISL23425WFVZ-TK?

In shutdown mode (SHDN bit = 0 in ACR), the ISL23425WFVZ-TK forces each DCP into end-to-end open circuit while internally connecting RWi to RLi through a 2kΩ resistor. Critically, the WR0 and WR1 register values are retained, enabling immediate restoration of the prior wiper position upon exit - with <1.5µs recall time after CS rising edge.

Can the ISL23425WFVZ-TK be used in ratiometric applications where VCC serves as the reference voltage?

Yes, the ISL23425WFVZ-TK is well-suited for ratiometric configurations. Its DCP terminals (RH, RW, RL) operate within 0V to VCC, and its ratiometric temperature coefficient (TCV) is specified at 8ppm/°C for the 10kΩ version - ensuring minimal gain drift when VCC is derived from the same source as the ADC reference.