Renesas X9271TV14IZ-2.7T1

Overview

X9271TV14IZ-2.7T1 from Intersil (now Renesas) is a single-channel, 256-tap, SPI-controlled digital potentiometer with 50kΩ end-to-end resistance, 2.7V–5.5V supply operation, and industrial temperature range (−40°C to +85°C). It functions as a programmable three-terminal potentiometer or two-terminal variable resistor for precision analog control in embedded systems, featuring nonvolatile storage of wiper positions, power-on recall from DR0, and <3µA standby current.

For engineers reviewing the X9271TV14IZ-2.7T1 datasheet, X9271TV14IZ-2.7T1 pinout, X9271TV14IZ-2.7T1 application, or X9271TV14IZ-2.7T1 equivalent, this device supports gain trimming in op-amp circuits, DC bias setting in RF amplifiers, LCD contrast adjustment, and sensor signal conditioning-requiring attention to SPI timing (2.5MHz max), wiper resistance (150Ω typ. at 5V), and hardware write protection via WP pin.

Technical Context

The X9271TV14IZ-2.7T1 implements a monolithic CMOS resistor ladder of 255 segments with CMOS switch-controlled wiper positioning, directly managed by an 8-bit volatile Wiper Counter Register (WCR). Its SPI interface complies with standard serial peripheral conventions: data latched on SCK rising edge, SO output on falling edge, and support for 2-byte (XFR) and 3-byte (Read/Write) instructions.

It integrates four 8-bit nonvolatile data registers (DR0–DR3) in Bank 0, enabling persistent storage of up to four distinct wiper positions; only DR0 loads automatically to WCR at power-up. The device includes hardware write protection (WP pin), HOLD for serial bus pause, dual device address pins (A0/A1), and operates across VCC = 2.7V–5.5V with guaranteed functionality down to 2.7V.

Key Specifications

Pinout & Package

14-lead TSSOP (4.4mm body width, M14.173 package drawing), RoHS-compliant with Pb-free + anneal termination.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5241BRMZ50 and MCP41050-I/P, the X9271TV14IZ-2.7T1 uniquely combines SPI interface, hardware write protection, HOLD functionality, and four nonvolatile registers with power-on recall-making it optimal for field-programmable, safety-critical, or maintenance-free analog trimming.

Availability

X9271TV14IZ-2.7T1 is available at Aetrix Electronics and suitable for industrial sensor calibration, RF front-end biasing, LCD display control, and audio signal processing requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for X9271TV14IZ-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

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

The X9271TV14IZ-2.7T1 belongs to Renesas' XDCP™ (eXternally Digitally Controlled Potentiometer) family, designed specifically for replacing mechanical potentiometers in precision analog control loops where programmability, nonvolatility, and SPI compatibility are required.

FAQ

What is the power-up behavior of the X9271TV14IZ-2.7T1?

At power-up, the X9271TV14IZ-2.7T1 automatically loads the contents of Data Register 0 (DR0) into its volatile Wiper Counter Register (WCR), restoring the last-saved wiper position. This occurs after V_CC stabilizes and requires no host intervention. The tPUW delay (max 50ms) must elapse before issuing a write command, while tPUR (min 1ms) applies for read operations.

Can the X9271TV14IZ-2.7T1 operate reliably at 2.7V supply?

Yes, the X9271TV14IZ-2.7T1 is fully specified for operation from 2.7V to 5.5V. Its SPI interface, wiper switching, and nonvolatile write functionality are all guaranteed across this range. At 2.7V, wiper resistance increases (typ. 300Ω), and ICC1 active current drops proportionally-enabling robust low-voltage embedded use.

How does hardware write protection work on the X9271TV14IZ-2.7T1?

The WP pin on the X9271TV14IZ-2.7T1 disables all nonvolatile writes (to DR0–DR3) when held LOW. This prevents accidental overwrites of calibrated values during normal operation or firmware updates. Volatile WCR writes and SPI reads remain fully functional regardless of WP state-preserving real-time adjustability while securing stored settings.

What is the function of the HOLD pin on the X9271TV14IZ-2.7T1?

The HOLD pin pauses an ongoing SPI transaction without resetting the internal command state. When asserted LOW (with SCK also LOW), it freezes clock and data flow; returning HOLD HIGH resumes communication from the exact point of interruption. This enables time-critical host tasks to preempt serial transfers without losing context or requiring reinitialization of the X9271TV14IZ-2.7T1.

Does the X9271TV14IZ-2.7T1 support daisy-chaining multiple devices on one SPI bus?

No, the X9271TV14IZ-2.7T1 does not support true daisy-chaining. It uses a standard SPI slave architecture with individual CS lines. However, up to four devices can share MOSI/MISO/SCK lines using separate CS signals, enabled by the A0/A1 address pins which configure unique 2-bit slave addresses-allowing efficient multi-potentiometer control with minimal GPIO overhead.