Renesas X9259TS24T1

Overview

X9259TS24T1 from Intersil (now Renesas) is a quad digitally controlled potentiometer (XDCP™) IC implementing four independent 256-tap, 50kΩ end-to-end resistance potentiometers with volatile wiper counter registers and nonvolatile data registers, controlled via 2-wire (I²C-compatible) interface, used for precision gain control, DC bias trimming, and programmable reference generation in analog signal conditioning circuits.

For engineers reviewing the X9259TS24T1 datasheet, X9259TS24T1 pinout, X9259TS24T1 application, or X9259TS24T1 equivalent, key selection considerations include its 24-pin SOIC package, 2.7V–5.5V single-supply operation, 100Ω typical wiper resistance at 5V, 0.4% resolution, and hardware write-protect (WP) pin for nonvolatile register safety.

Technical Context

The X9259TS24T1 integrates four monolithic CMOS DCP cores, each with resistor ladder and CMOS switch array, where wiper position is controlled by an 8-bit volatile Wiper Counter Register (WCR). Each DCP has four nonvolatile Data Registers (DR00–DR03 per channel) supporting persistent storage of up to four distinct wiper positions per potentiometer.

It operates as a 2-wire slave device with address pins A0–A3 enabling up to 16 devices on one bus; SDA is open-drain requiring external pull-up; WP pin disables nonvolatile writes when asserted low; power-up loads DR#0 into corresponding WCR, ensuring deterministic startup behavior without host intervention.

Key Specifications

Pinout & Package

Package: 24-lead SOIC (RoHS-compliant, M24.3 drawing), body width 7.5mm, standard JEDEC MS-013 footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5204BRUZ10 and MCP42050-I/P, the X9259TS24T1 uniquely combines quad 50kΩ channels, I²C compatibility, hardware write protection, and four nonvolatile registers per channel-making it optimal for industrial systems requiring robust, self-contained, field-programmable analog calibration.

Availability

X9259TS24T1 is available at Aetrix Electronics and suitable for audio equipment manufacturing, sensor signal conditioning, programmable power supply design, and industrial calibration systems requiring stable component supply and long-term parameter retention.

Supply support for X9259TS24T1 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 (formerly Intersil) is a global semiconductor leader specializing in microcontrollers, analog, power management, and mixed-signal solutions for industrial, automotive, and communications markets.

The X9259 product line delivers digitally programmable analog front-ends for precision calibration, replacing mechanical potentiometers in systems demanding repeatability, remote control, and nonvolatile configuration storage.

FAQ

What is the function of the WP pin on the X9259TS24T1?

The WP (Write Protect) pin on the X9259TS24T1 is an active-low hardware input that disables all nonvolatile writes to the Data Registers when pulled low. This prevents accidental overwriting of factory-calibrated or field-trimmed values stored in DR#0–DR#3. When WP is high or floating (with internal pull-up inactive), nonvolatile writes proceed normally after the 10ms high-voltage write cycle. The X9259TS24T1 retains full volatile wiper control regardless of WP state.

Does the X9259TS24T1 require external pull-up resistors on SDA and SCL?

Yes, the X9259TS24T1 requires external pull-up resistors on both SDA and SCL lines because its SDA pin is open-drain and SCL is a CMOS input. Typical values range from 2.2kΩ to 10kΩ depending on bus capacitance and speed requirements (max 400kHz). Pull-ups must connect to the same VCC rail used by the X9259TS24T1 to ensure valid logic levels and proper ACK timing during I²C transactions.

How does the X9259TS24T1 handle power-up initialization?

At power-up, the X9259TS24T1 automatically loads the contents of DR#0 (Data Register 0) for each of the four DCPs into their respective volatile Wiper Counter Registers (WCR0–WCR3). This ensures repeatable, known wiper positions without host intervention. The loading occurs after VCC stabilizes and meets tPUR (1ms) and tPUW (50ms) timing requirements. No external reset signal is needed-the X9259TS24T1 is fully autonomous at startup.

Can the X9259TS24T1 be used as a two-terminal variable resistor?

Yes, the X9259TS24T1 supports two-terminal variable resistor operation by connecting either RHx or RLx to the same node as RWx (e.g., short RH0 to RW0), leaving the unused terminal open. In this configuration, resistance varies from near-0Ω (wiper at shorted terminal) to RTOTAL (wiper at opposite terminal). Wiper resistance (100Ω typ.) becomes part of the total resistance path, which must be accounted for in precision current-source or gain-setting applications.

What is the maximum clock frequency supported by the X9259TS24T1's 2-wire interface?

The X9259TS24T1 supports a maximum 2-wire (I²C-compatible) clock frequency of 400kHz, compliant with Fast-mode I²C specifications. This allows efficient register access and wiper updates within ~200µs per byte transferred. Timing parameters-including tHIGH (600ns min), tLOW (1300ns min), and tSU:DAT (100ns min)-are guaranteed across the full operating temperature and voltage range (2.7V–5.5V, –40°C to +85°C) for the X9259TS24T1.