Renesas X95840WV20I-2.7T1

Overview

X95840WV20I-2.7T1 from Intersil is a quad digital controlled potentiometer (XDCP™) IC implementing four independent 256-tap, 10kΩ DCPs with I²C interface, 70Ω typical wiper resistance at 3.3V, and non-volatile initial value storage-used for precision analog parameter tuning in sensor signal conditioning circuits.

For engineers reviewing the X95840WV20I-2.7T1 datasheet, X95840WV20I-2.7T1 pinout, X95840WV20I-2.7T1 application, or X95840WV20I-2.7T1 equivalent, key selection criteria include I²C address configurability (A0–A2), hardware write protection (WP), power-up recall behavior, and voltage divider vs. rheostat mode performance across -40°C to +85°C.

Technical Context

The X95840WV20I-2.7T1 integrates four monolithic CMOS DCPs sharing a single I²C slave interface with configurable 7-bit address (1010xxxR/W). Each DCP features an 8-bit volatile Wiper Register (WR) and a corresponding non-volatile Initial Value Register (IVR) that loads into WR at power-up after V_POR ≥ 2.6V.

Operation supports both voltage divider mode (RH–RL–RW) and two-terminal rheostat mode (RW–RL or RW–RH), with monotonic DNL ≤ ±0.5 LSB and INL ≤ ±1 LSB over full tap range. Wiper response time is 1 µs from SCL falling edge to physical position change.

Key Specifications

Pinout & Package

Package: 20-lead TSSOP (Thin Shrink Small Outline Package), 6.5mm × 4.4mm body, 0.65mm lead pitch, RoHS-compliant Pb-free plus anneal finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5242BRUZ10 and MCP45HV51-103E/ST, the X95840WV20I-2.7T1 uniquely combines hardware write protection, guaranteed 50-year IVR retention at ≤75°C, and matched DCP-to-DCP performance (±2 LSB VMATCH), making it optimal for industrial calibration and safety-critical analog tuning where parameter persistence and fault immunity are mandatory.

Availability

X95840WV20I-2.7T1 is available at Aetrix Electronics and suitable for industrial sensor calibration, programmable gain amplifiers, audio channel balancing, and LED driver current tuning requiring stable component supply across extended product lifecycles.

Supply support for X95840WV20I-2.7T1 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) designs high-performance analog and mixed-signal ICs for industrial, communications, and computing markets, with ISO9001-certified manufacturing.

The X95840 family delivers digitally controlled precision resistive elements for calibration-critical analog signal chains, targeting applications where mechanical potentiometer replacement, long-term parameter stability, and I²C configurability are essential.

FAQ

What is the default wiper position of each DCP in X95840WV20I-2.7T1 at power-up?

At power-up, all four wiper registers (WR0–WR3) in the X95840WV20I-2.7T1 reset to 0x80 (128 decimal), placing each wiper at mid-scale-approximately 50% of total resistance between RH and RL terminals. This occurs after V_CC exceeds V_POR (min 2.6V) and before the I²C interface becomes active, ensuring predictable startup behavior in analog circuits.

Does X95840WV20I-2.7T1 support both voltage divider and rheostat configurations?

Yes, the X95840WV20I-2.7T1 supports both modes: voltage divider mode uses RH, RL, and RW terminals to form a three-terminal potentiometer, while rheostat mode connects only RW and RL (or RW and RH) for two-terminal variable resistance. Performance specs-including DNL (±0.5 LSB), INL (±1 LSB), and TCR (±45 ppm/°C)-are validated in both configurations per datasheet Figures 3–8.

How does the WP pin function in X95840WV20I-2.7T1, and what happens when it is pulled low?

When WP is pulled low, the X95840WV20I-2.7T1 ignores all I²C write operations-including volatile WR updates and non-volatile IVR writes-and responds with no ACK. The device remains in standby mode until WP returns high and a new START condition is detected. This hardware lock prevents unintended register changes during power sequencing or system faults.

What is the maximum I²C clock frequency supported by X95840WV20I-2.7T1, and are there timing constraints for reliable communication?

The X95840WV20I-2.7T1 supports I²C fast-mode operation up to 400kHz. Critical timing parameters include t_SU:STA (600ns), t_LOW (1300ns), and t_R/t_F (20 + 0.1·C_b ns, max 250ns), all verified across -40°C to +85°C. Bus capacitance must stay within 10–400pF; for 400pF loads, pull-up resistors should be ≤2.5kΩ to meet rise/fall time specs.

Can X95840WV20I-2.7T1's non-volatile registers be rewritten in-system, and what is the write cycle time?

Yes, the X95840WV20I-2.7T1 allows in-system IVR rewrites via I²C. A non-volatile write cycle takes 12–20ms (t_WP), during which the device ignores further I²C activity and places SDA in high-impedance state. After completion, it automatically enters standby mode. Each IVR supports 150,000 write cycles, with data retention guaranteed for 50 years at ≤75°C.