Renesas X9252US24I-2.7

Overview

X9252US24I-2.7 from Renesas Electronics is a quad digitally controlled potentiometer (XDCP™) with 256-tap resolution per channel, 2.8 kΩ end-to-end resistance, 2-wire and Up/Down interfaces, and nonvolatile data registers. It operates from 2.7 V to 5.5 V, supports industrial temperature range (−40°C to +85°C), and delivers <100 µA standby current - used for precision bias voltage trimming in analog front-ends and programmable gain control circuits.

For engineers reviewing the X9252US24I-2.7 datasheet, X9252US24I-2.7 pinout, X9252US24I-2.7 application, or X9252US24I-2.7 equivalent, key selection considerations include wiper position recall at power-up, hardware write protection (WP pin), DCP-select capability via DS0/DS1, and dual-interface flexibility for embedded calibration and factory programming.

Technical Context

The X9252US24I-2.7 integrates four independent 255-segment resistor arrays, each with a volatile 8-bit Wiper Counter Register (WCR) and four nonvolatile Data Registers (DR00–DR33). Wiper position is set either via 2-wire serial interface (SCL/SDA, A0–A2 addressable) or discrete Up/Down control (U/D, CS, DS0/DS1).

At power-up, DR00, DR10, DR20, and DR30 load into WCR0–WCR3 respectively. The WP pin disables nonvolatile writes when low, and the CS pin toggles between 2-wire (CS high) and Up/Down (CS low) modes - enabling deterministic interface isolation without software arbitration.

Key Specifications

Pinout & Package

Package: 24-lead TSSOP (4.4 mm width), RoHS-compliant, moisture sensitivity level per JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5242BRUZ10 and MCP42010-I/ST, the X9252US24I-2.7 uniquely combines quad 2.8 kΩ DCPs, dual 2-wire/Up-Down control, hardware write protection, and guaranteed power-up recall - making it optimal for multi-channel, field-serviceable, and safety-certified analog systems.

Availability

X9252US24I-2.7 is available at Aetrix Electronics and suitable for industrial sensor calibration, medical instrumentation trimming, programmable power supply feedback, and audio signal conditioning requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for X9252US24I-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

Renesas Electronics is a global semiconductor leader delivering microcontrollers, analog power, and SoC solutions for automotive, industrial, and IoT applications - with emphasis on reliability, functional safety, and long-term product support.

The X9252US24I-2.7 belongs to Renesas' XDCP™ family of digitally controlled potentiometers, designed specifically for high-accuracy, nonvolatile analog trimming in harsh environments where mechanical potentiometers fail due to wear, contamination, or thermal drift.

FAQ

What is the default power-up behavior of the X9252US24I-2.7?

At power-up, the X9252US24I-2.7 automatically loads the contents of nonvolatile Data Registers DR00, DR10, DR20, and DR30 into Wiper Counter Registers WCR0–WCR3, respectively. This ensures repeatable analog settings without host intervention. The device requires VCC ≥2.7 V and CS high during power-up to prevent inadvertent store operations - timing delay from VCC stabilization to full functionality is ≤2 ms.

How does the WP pin affect nonvolatile writes in the X9252US24I-2.7?

When the WP pin is driven LOW, the X9252US24I-2.7 disables all nonvolatile write operations - including both 2-wire "Write DR" commands and Up/Down interface "Store" actions. This hardware lock prevents accidental overwriting of factory-calibrated values during system operation or field service. Volatile writes to WCRs remain fully functional regardless of WP state.

Can the X9252US24I-2.7 operate with only the Up/Down interface, without using the 2-wire bus?

Yes - the X9252US24I-2.7 supports standalone Up/Down operation when CS is held LOW. In this mode, SCL serves as the clock, U/D sets direction, and DS0/DS1 select the target DCP (DCP0–DCP3). The 2-wire interface (SDA/SCL/A0–A2) is disabled. This enables simple, low-pin-count field adjustment using momentary switches or GPIOs, independent of I²C infrastructure.

What is the maximum wiper current rating for the X9252US24I-2.7, and how does it impact design?

The X9252US24I-2.7 specifies a maximum wiper current of ±3 mA per DCP. Exceeding this limit risks permanent damage to internal switches and degrades linearity. Designers must ensure that voltage across any RH–RL pair and resulting wiper current (calculated as V_RH–RL/R_TOTAL × tap position ratio) stays within ±3 mA - especially critical in low-resistance configurations like the 2.8 kΩ version used in the X9252US24I-2.7.

How does the X9252US24I-2.7 handle register addressing for simultaneous updates across all four DCPs?

The X9252US24I-2.7 supports page-write operations: writing to WCR0–WCR3 or DRi0–DRi3 (i = 0–3) simultaneously using a single 2-wire transaction. This is achieved by first loading the Status Register (address 07h) to select the target row (e.g., 00h for WCRs), then issuing a 4-byte write to addresses 00h–03h. This reduces I²C bus overhead and ensures atomic updates across channels - essential for synchronized gain/offset correction.