Renesas X9317UPI

Overview

X9317UPI from Renesas Electronics is a digitally controlled potentiometer (XDCP™) implementing a 99-element resistor array with 100 wiper tap positions, nonvolatile wiper position storage, and 3-wire up/down serial interface. It functions as a solid-state three-terminal voltage divider or two-terminal variable resistor for precision analog trimming in low-power systems operating from 2.7V to 5.5V.

For engineers reviewing the X9317UPI datasheet, X9317UPI pinout, X9317UPI application, or X9317UPI equivalent, this page delivers verified specifications including ±20% end-to-end resistance tolerance, 200Ω typical wiper resistance at 5V, -120dBV noise, ±300ppm/°C total resistance temperature coefficient, and 100-year data retention - all critical for bias control, gain trim, and regulator feedback loop design.

Technical Context

The X9317UPI uses a 7-bit up/down counter decoded to select one of 100 wiper positions across a monolithic resistor ladder. Its "make-before-break" switching ensures continuity during wiper transitions, while nonvolatile memory stores the last position for automatic recall on power-up.

Control relies exclusively on three digital inputs: CS (chip select), U/D (direction), and INC (negative-edge-triggered increment). No clock or address lines are required. The device enters standby mode (<5µA ICC) when CS is high, enabling ultra-low-power operation in battery-sensitive applications.

Key Specifications

Pinout & Package

Package: 8-lead SOIC (M8.15E), RoHS-compliant, 0°C to +70°C operating range.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5170BRMZ-10 and MCP41010-I/P, the X9317UPI trades resolution and interface flexibility for guaranteed power-on repeatability and robustness in standalone analog trimming - making it optimal for unattended equipment where first-power accuracy is non-negotiable.

Availability

X9317UPI is available at Aetrix Electronics and suitable for LCD bias control, laser diode bias control, voltage regulator output control, gain and offset trim, and DC bias adjustment requiring stable component supply across commercial and industrial temperature ranges.

Supply support for X9317UPI 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 specializing in microcontrollers, analog power, and mixed-signal solutions for automotive, industrial, and enterprise applications.

The X9317UPI belongs to Renesas' XDCP™ (eXternally Digitally Controlled Potentiometer) family, engineered for high-reliability analog trimming in systems where mechanical potentiometers fail due to wear, contamination, or thermal drift.

FAQ

What is the maximum wiper current rating for the X9317UPI?

The X9317UPI supports a maximum wiper current (IW) of ±4.4mA under specified test conditions. This limit applies regardless of RTOTAL value or supply voltage. Exceeding this current risks irreversible damage to the internal wiper switches and resistor elements. For applications requiring higher current, external buffering with an op-amp or transistor stage is recommended before connecting to the RW terminal. Always verify current through RW using Ohm's Law based on actual RH–RL voltage and effective resistance at selected tap position.

Does the X9317UPI require an external clock or microcontroller to operate?

No, the X9317UPI operates autonomously using only three GPIO-level control signals: CS, U/D, and INC. It contains an integrated 7-bit up/down counter and decoder - no external clock, SPI/I²C controller, or firmware is needed. A simple push-button circuit with debounce or a basic MCU GPIO toggle suffices for manual or automated adjustment. This architecture reduces system complexity and eliminates timing-critical software dependencies in safety-critical analog control loops.

How does the X9317UPI handle power-up sequencing to prevent unintended wiper movement?

The X9317UPI requires VCC/VSS to be applied before any control signals. To avoid spurious wiper shifts or accidental nonvolatile writes during power-up, the datasheet mandates bringing CS and INC high *before or concurrently* with VCC reaching its final value. Once powered, the wiper stabilizes within 5µs (tPU). If CS and INC are left floating or low during ramp-up, undefined counter states may result. A pull-up resistor on CS (to VCC) and pull-down on INC (to VSS) is strongly recommended for robust power sequencing.

Can the X9317UPI be used in a two-terminal configuration for current control?

Yes, the X9317UPI supports two-terminal operation by connecting either RH or RL to the same node as RW, effectively creating a variable resistor between the remaining fixed terminal and RW. In this mode, the device controls current in series with a load - for example, setting bias current in LED drivers or laser diode modules. Designers must observe the 10mW power rating and ensure wiper current stays within ±4.4mA. The 10kΩ RTOTAL and low wiper resistance make it suitable for low-voltage, low-current trimming applications.

What is the significance of the "make-before-break" switching behavior in the X9317UPI?

The X9317UPI's "make-before-break" wiper switching ensures electrical continuity between adjacent taps during position changes - preventing momentary open-circuits that could cause glitches in op-amp feedback paths, comparator hysteresis networks, or voltage reference dividers. This behavior eliminates output transients that might trigger false interrupts or destabilize control loops. However, during multi-step movements, temporary parallel connection of multiple taps slightly reduces effective RTOTAL; designers should allow ≥5µs settling time (tIW) after INC toggles before sampling RW voltage.