Renesas ISL95810WIU8-T

Overview

ISL95810WIU8-T from Renesas (formerly Intersil) is a single-channel, 256-tap digitally controlled potentiometer (XDCP™) with I²C interface, 10kΩ end-to-end resistance, ±20% tolerance, and wiper resistance of 70Ω typical at 3.3V. It operates from 2.7V to 5.5V, supports volatile and non-volatile wiper position storage, and is used for precision analog trimming in power supply feedback loops, sensor calibration, and audio level control.

For engineers reviewing the ISL95810WIU8-T datasheet, ISL95810WIU8-T pinout, ISL95810WIU8-T application, or ISL95810WIU8-T equivalent, key selection criteria include I²C-compatible digital control, 0.4% resolution (1/256), 5µA standby current, non-volatile initial value recall at power-up, and MSOP-8 packaging suitable for space-constrained industrial and embedded designs.

Technical Context

The ISL95810WIU8-T implements a monolithic CMOS DCP using resistor ladders and CMOS switches, with wiper position controlled via an 8-bit volatile Wiper Register (WR) and initialized from a non-volatile Initial Value Register (IVR). Its I²C interface operates up to 400kHz, supports hardware write protection (WP pin), and uses standard START/STOP/ACK protocol with 7-bit address 0x54 (0101000b).

At power-on, the device resets WR to 0x80 (mid-scale), then loads the IVR value into WR after VCC exceeds 1.8V. The DCP functions as either a three-terminal potentiometer (RH–RW–RL) or two-terminal rheostat (RW–RL or RW–RH), with monotonic tap response, ±4 ppm/°C ratiometric temperature coefficient in voltage divider mode, and 200,000-cycle EEPROM endurance.

Key Specifications

Pinout & Package

ISL95810WIU8-T is housed in an 8-lead MSOP package (3.0mm × 3.0mm × 1.0mm height), RoHS-compliant with matte tin terminations, MSL3 rated, and optimized for reflow soldering.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5170BRMZ-10 and MCP4017T-103I/OT, ISL95810WIU8-T uniquely combines I²C compatibility, ultra-low 70Ω wiper resistance, non-volatile initialization, and monotonic 256-tap resolution-making it optimal for precision, power-cycle-robust analog tuning in industrial and embedded systems.

Availability

ISL95810WIU8-T is available at Aetrix Electronics and suitable for power supply trimming, sensor calibration, audio volume control, and DAC scaling requiring stable component supply, long-term parametric consistency, and RoHS-compliant packaging.

Supply support for ISL95810WIU8-T 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 through the acquisition of Intersil, is a global semiconductor leader delivering microcontrollers, analog, power, and connectivity solutions for automotive, industrial, and IoT markets.

The ISL95810WIU8-T belongs to Renesas' XDCP™ digitally controlled potentiometer family, engineered for high-precision, software-configurable analog adjustment in space-constrained, low-power embedded systems.

FAQ

What is the default wiper position of the ISL95810WIU8-T at power-up?

At power-up, the ISL95810WIU8-T initializes its volatile Wiper Register (WR) to 0x80 (128 decimal), placing the wiper at mid-scale. Within milliseconds, it loads the non-volatile Initial Value Register (IVR) value into WR-defaulting to 0x80 unless previously programmed. This ensures repeatable startup behavior without host intervention.

Does the ISL95810WIU8-T support true I²C multi-master arbitration?

No. The ISL95810WIU8-T operates exclusively as an I²C slave device and does not implement arbitration logic. It responds only to START conditions and valid 7-bit address 0x54 (0101000b) followed by R/W bit. Multi-master contention must be managed externally by the system master controller.

Can the ISL95810WIU8-T be used in rheostat mode with only two terminals?

Yes. The ISL95810WIU8-T supports rheostat configuration by connecting either RH or RL to GND/VCC and using RW with the unconnected terminal left floating. In this mode, resistance between RW and the grounded terminal varies from near-zero to 10kΩ, enabling programmable current limiting or bias adjustment.

What is the maximum capacitive load the ISL95810WIU8-T SDA/SCL pins can drive?

The ISL95810WIU8-T specifies a maximum bus capacitance (Cb) of 400pF for reliable 400kHz I²C operation. With 400pF loading, external pull-up resistors should be ≤2.5kΩ; for 40pF, up to 20kΩ is permissible. Exceeding these values risks violating tR/tF and tBUF timing limits per I²C specification.

How does the WP pin affect non-volatile writes on the ISL95810WIU8-T?

The WP pin must be held HIGH for any write operation-including non-volatile writes-to the ISL95810WIU8-T. When WP is LOW, the device ignores incoming data bytes, omits ACK responses, and remains in standby. This hardware lock prevents unintended EEPROM writes during power-up, brown-out, or firmware faults.