Renesas X95840WV20I-2.7

Overview

X95840WV20I-2.7 from Intersil is a quad digital controlled potentiometer (XDCP™) IC with I²C interface, 256-tap resolution, 10kΩ end-to-end resistance, and 20-lead TSSOP package. It operates from 2.7V to 5.5V, delivers <5µA standby current, and integrates non-volatile initial value registers for power-up wiper recall-used in precision analog trimming, sensor calibration, and programmable gain control.

For engineers reviewing the X95840WV20I-2.7 datasheet, X95840WV20I-2.7 pinout, X95840WV20I-2.7 application, or X95840WV20I-2.7 equivalent, key selection criteria include I²C address configurability (A0–A2), hardware write protection (WP), wiper resistance (70Ω typ.), and guaranteed monotonicity in both voltage divider and rheostat modes across industrial temperature range (–40°C to +85°C).

Technical Context

The X95840WV20I-2.7 implements four independent digitally controlled potentiometers using resistor ladders and CMOS switches, each controlled by an 8-bit volatile wiper register (WR) and backed by a non-volatile initial value register (IVR). At power-up, IVR contents are loaded into WRs, defaulting to mid-scale (0x80) if unprogrammed.

Its I²C slave interface supports standard-mode (400kHz) operation with three address pins (A0–A2), enabling up to eight devices on one bus. Write protection is enforced via active-low WP pin, and non-volatile writes require STOP condition initiation with internal 12–20ms self-timed cycle.

Key Specifications

Pinout & Package

Package: 20-lead Thin Shrink Small Outline Package (TSSOP), RoHS-compliant, body dimensions 6.5mm × 4.4mm × 1.2mm (D × E1 × A2), 0.65mm lead pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5242BRUZ10 and MCP4641T-103E/ST, the X95840WV20I-2.7 uniquely combines quad channel count, hardware write protection, automatic IVR-to-WR power-up loading, and industrial temperature-rated EEPROM in a single 20-pin I²C package-reducing BOM count and simplifying firmware for embedded analog tuning.

Availability

X95840WV20I-2.7 is available at Aetrix Electronics and suitable for audio signal conditioning, sensor calibration, programmable power supplies, and industrial analog I/O scaling requiring stable component supply and long-term traceability.

Supply support for X95840WV20I-2.7 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 solutions.

The X95840 family was designed specifically for replacing mechanical potentiometers in industrial, test equipment, and communications systems where programmable, non-volatile, and low-noise analog adjustment is required.

FAQ

What is the default wiper position of the X95840WV20I-2.7 at power-up?

At power-up, the X95840WV20I-2.7 loads the contents of its four non-volatile Initial Value Registers (IVRs) into the corresponding volatile Wiper Registers (WRs). If unprogrammed, the factory-default IVR value is 0x80 (128 decimal), placing each wiper at mid-scale between RH and RL terminals. This behavior is guaranteed across the full –40°C to +85°C operating range and requires no external initialization.

Does the X95840WV20I-2.7 support true 4-wire (Kelvin) connections for precision rheostat use?

No, the X95840WV20I-2.7 does not support 4-wire Kelvin sensing. Each DCP has only three terminals (RH, RL, RW); the wiper resistance (70Ω typ.) is inherent to the CMOS switch architecture and contributes directly to measurement error in 2-terminal rheostat configurations. For high-accuracy current-setting applications, design margins must account for this wiper resistance variation across temperature and supply voltage.

Can the X95840WV20I-2.7 be used with 1.8V I²C buses?

No, the X95840WV20I-2.7 is not compatible with 1.8V I²C buses. Its absolute minimum VCC is 2.7V, and its I²C input thresholds (VIH = 0.7×VCC, VIL = 0.3×VCC) require VCC ≥ 2.7V to meet standard I²C logic levels. Operating below 2.7V violates recommended conditions and may cause unreliable communication or register corruption.

How does hardware write protection (WP pin) affect non-volatile versus volatile register access on the X95840WV20I-2.7?

When the WP pin is pulled low, the X95840WV20I-2.7 ignores all I²C write operations-including writes to volatile Wiper Registers (WRs) and non-volatile Initial Value Registers (IVRs). The device responds with no ACK and remains in standby. Read operations remain fully functional regardless of WP state, allowing safe monitoring of wiper positions and register contents without risk of unintended modification.

What is the maximum capacitive load the X95840WV20I-2.7 SDA/SCL lines can drive per the datasheet?

The X95840WV20I-2.7 specifies a total capacitive loading limit of 400pF for SDA and SCL lines combined (Cb ≤ 400pF). This includes on-chip pin capacitance (10pF) plus all PCB trace and external device contributions. Exceeding 400pF increases rise/fall times beyond specification (tR/tF ≤ 250ns), risking I²C timing violations-especially at 400kHz. External pull-up resistors must be scaled accordingly (e.g., ~2.2kΩ for 400pF).