Renesas ISL95810UIU8-T

Overview

ISL95810UIU8-T from Intersil is a single-channel, digitally controlled potentiometer (XDCP™) implemented in monolithic CMOS, functioning as a 256-tap, 50kΩ I²C-controlled variable resistor or three-terminal voltage divider. It features volatile wiper register (WR) and non-volatile initial value register (IVR), 70Ω typical wiper resistance at 3.3V, and operates from 2.7V to 5.5V supply. It is used for precision analog parameter tuning in power supply feedback loops and sensor calibration circuits.

For engineers reviewing the ISL95810UIU8-T datasheet, ISL95810UIU8-T pinout, ISL95810UIU8-T application, or ISL95810UIU8-T equivalent, key selection considerations include its 50kΩ end-to-end resistance, ±0.5 LSB DNL in voltage divider mode, I²C-compatible 400kHz interface timing, and MSOP-8 package compatibility with industrial temperature range (–40°C to +85°C).

Technical Context

The ISL95810UIU8-T integrates a resistor ladder with CMOS switch matrix controlled by an 8-bit wiper register, enabling monotonic tap positioning from RH to RL. Its I²C slave interface uses fixed 7-bit address 0x54 (0101000b) and supports both volatile writes (to WR only) and non-volatile writes (to WR and IVR), with hardware write protection via active-low WP pin.

Power-up behavior is defined by recall of IVR contents into WR after VCC exceeds 1.8V; default IVR value is 0x80 (mid-scale). The device supports two operational modes: voltage divider (RH–RW–RL) and rheostat (RW–RL or RW–RH), with ratiometric temperature coefficient of ±4 ppm/°C and resistance TC of ±45 ppm/°C over –40°C to +85°C.

Key Specifications

Pinout & Package

ISL95810UIU8-T is housed in an 8-lead MSOP (Mini Small Outline Plastic) package, 3.0mm × 3.0mm footprint, 0.65mm pitch, with exposed pad optional per design. Pin 1 marked by index area; lead finish is Pb-free plus anneal (RoHS compliant).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5170BRMZ-50 and MCP45HV51-503E/MS, the ISL95810UIU8-T offers tighter DNL (±0.5 LSB), lower wiper resistance (70Ω), and integrated hardware write protection-making it optimal for precision, low-noise, and safety-critical analog trimming where pin count and voltage margin are constrained.

Availability

ISL95810UIU8-T is available at Aetrix Electronics and suitable for power supply feedback tuning, sensor calibration, audio volume control, and laser diode bias adjustment requiring stable component supply and RoHS-compliant packaging.

Supply support for ISL95810UIU8-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

Intersil Corporation (now part of Renesas Electronics) is a U.S.-based analog and mixed-signal semiconductor company focused on power management, precision analog, and interface ICs.

The ISL95810UIU8-T belongs to Intersil's XDCP™ digitally controlled potentiometer family, designed specifically for replacing mechanical trimmers in industrial, computing, and communications equipment where programmability, reliability, and small footprint are critical.

FAQ

What is the default wiper position at power-up for the ISL95810UIU8-T?

At power-up, the ISL95810UIU8-T loads the value stored in its non-volatile Initial Value Register (IVR) into the volatile Wiper Register (WR). The device ships pre-programmed with 0x80 (128 decimal) in the IVR, placing the wiper at mid-scale-approximately 50% of the 50kΩ total resistance-between RH and RL terminals. This ensures predictable startup behavior without host intervention.

Does the ISL95810UIU8-T support both voltage divider and rheostat configurations?

Yes, the ISL95810UIU8-T supports both configurations. In voltage divider mode, RH and RL are connected to fixed reference voltages (e.g., VCC and GND), and RW provides a programmable tap point. In rheostat mode, either RH or RL is left unconnected while RW and the other terminal form a two-terminal variable resistor. Datasheet performance specs-including INL, DNL, and TCR-are validated for both modes.

How does the WP (Write Protect) pin function on the ISL95810UIU8-T?

The WP pin on the ISL95810UIU8-T is an active-low hardware lock: when held HIGH, normal I²C read/write operations are permitted; when pulled LOW, all write commands (volatile and non-volatile) are ignored, and the device responds only to reads. This prevents unintended register changes during system operation or firmware updates, adding a layer of robustness beyond software-level protection.

What is the maximum I²C clock frequency supported by the ISL95810UIU8-T?

The ISL95810UIU8-T supports I²C Fast-mode operation up to 400kHz, as specified in its timing parameters (tLOW = 1300ns, tHIGH = 600ns, fSCL = 400kHz). It is not rated for High-speed mode (3.4MHz). External pull-up strength must be selected per bus capacitance (Cb ≤ 400pF) to meet rise/fall time requirements (tR/tF ≤ 250ns).

Is the ISL95810UIU8-T RoHS compliant and what is its lead finish?

Yes, the ISL95810UIU8-T is RoHS compliant. It uses Intersil's Pb-free plus anneal material set, featuring 100% matte tin plate termination finish, compatible with both SnPb and Pb-free soldering processes. The "-Z" suffix denotes Pb-free variants; ISL95810UIU8-T includes this compliance by default per ordering information in FN8090 Rev 2.00.