Renesas ISL23325TFVZ-T7A

Overview

ISL23325TFVZ-T7A from Renesas Electronics (formerly Intersil) is a dual, volatile, 256-tap digitally controlled potentiometer with I²C interface, 100kΩ end-to-end resistance, 16-lead µTQFN package, and operation from -40°C to +125°C. It functions as two independent programmable resistive dividers or rheostats in analog signal conditioning and trimming circuits for battery-powered instrumentation.

For engineers reviewing the ISL23325TFVZ-T7A datasheet, ISL23325TFVZ-T7A pinout, ISL23325TFVZ-T7A application, or ISL23325TFVZ-T7A equivalent, key selection criteria include its 1.2V–5.5V VLOGIC supply independence, 70Ω typical wiper resistance at 3.3V, ±0.15 LSB differential nonlinearity (U/T options), shutdown mode with internal RL connection, and 16-lead 2.6×1.8mm µTQFN footprint.

Technical Context

The ISL23325TFVZ-T7A integrates two monolithic CMOS DCP cores with make-before-break wiper switching, volatile 8-bit Wiper Registers (WR0/WR1), and an I²C slave interface supporting up to 400kHz clock rate. Each DCP operates in voltage divider or rheostat mode with monotonic tap transitions and power-on reset to mid-scale (128).

Its dual-rail architecture separates analog supply (VCC = 1.7V–5.5V) from logic supply (VLOGIC = 1.2V–5.5V), enabling direct interfacing with low-voltage microcontrollers without level shifters. The device supports three hardware address pins (A0–A2), allowing up to eight units on a single I²C bus.

Key Specifications

Pinout & Package

ISL23325TFVZ-T7A uses a 16-lead 2.6×1.8mm µTQFN package (RoHS-compliant, NiPdAu e4 termination). Pinout validated per FN7870 Rev 1.00, Page 2 (µTQFN top view) and Page 3 (ordering info confirming TFRUZ-T7A = 16 Ld µTQFN).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5175BRMZ-100 and MCP45HV51-103E/MS, the ISL23325TFVZ-T7A uniquely combines dual-channel integration, true 1.2V I²C operation, and 100kΩ resistance in a thermally optimized µTQFN-making it optimal for compact, battery-powered systems demanding precision trimming with minimal external components.

Availability

ISL23325TFVZ-T7A is available at Aetrix Electronics and suitable for power supply margining, RF amplifier bias compensation, sensor circuit trimming, and battery-powered instrument gain adjustment requiring stable component supply across extended temperature and low-voltage logic environments.

Supply support for ISL23325TFVZ-T7A 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 markets.

The ISL23325TFVZ-T7A belongs to Renesas' XDCP™ (eXternally Digitally Controlled Potentiometer) product line, designed specifically for replacing mechanical trimpots in high-reliability analog trimming applications where programmability, temperature stability, and low-power operation are critical.

FAQ

What is the default wiper position of the ISL23325TFVZ-T7A after power-up?

Upon power-up, both Wiper Registers (WR0 and WR1) of the ISL23325TFVZ-T7A reset to 128 (0x80 hex), positioning each wiper at the mid-scale point of the 256-tap resistor ladder. This ensures a known, centered starting point for voltage divider or rheostat operation-critical for deterministic startup behavior in safety-aware systems.

Does the ISL23325TFVZ-T7A support true 1.2V I²C bus operation?

Yes, the ISL23325TFVZ-T7A supports true 1.2V I²C bus operation via its dedicated VLOGIC pin, which accepts 1.2V–5.5V. Its input thresholds scale with VLOGIC (VIH = 0.7×VLOGIC), and SDA/SCL buffers operate correctly at 1.2V without external level shifters-enabling direct connection to ultra-low-voltage microcontrollers.

Can the ISL23325TFVZ-T7A be used in rheostat mode?

Yes, the ISL23325TFVZ-T7A supports rheostat mode by connecting either RH or RL to the same node and using RW and the unconnected terminal. In this configuration, it provides 256-step variable resistance from 0Ω to 100kΩ with ±0.3 LSB differential nonlinearity-ideal for programmable gain control and LED current setting.

What happens to wiper settings during shutdown mode of the ISL23325TFVZ-T7A?

In shutdown mode (SHDN bit = 0 in ACR register), the ISL23325TFVZ-T7A disconnects the resistor array from RH/RL terminals and internally connects each RWi to its corresponding RLi through a 2kΩ resistor. Crucially, the WR0 and WR1 register values are retained-allowing immediate restoration of prior settings upon exit from shutdown.

How many ISL23325TFVZ-T7A devices can share the same I²C bus?

Up to eight ISL23325TFVZ-T7A devices can share a single I²C bus using the three hardware address pins A0, A1, and A2. Each pin accepts GND or VLOGIC to configure a unique 3-bit address suffix, resulting in distinct 7-bit slave addresses (0x50–0x57) per device-enabling scalable multi-channel trimming in complex systems.