Renesas X9317WM8I

Overview

X9317WM8I from Renesas Electronics is a digitally controlled potentiometer (XDCP™) implementing a 99-element resistor array with 100 wiper tap points, nonvolatile wiper position storage, and 3-wire up/down serial interface. It operates from 2.7V to 5.5V, delivers ±20% end-to-end resistance tolerance at 10kΩ, and supports voltage divider or variable resistor configurations in precision analog trimming applications.

For engineers reviewing the X9317WM8I datasheet, X9317WM8I pinout, X9317WM8I application, or X9317WM8I equivalent, this device serves as a solid-state replacement for mechanical potentiometers where power-up repeatability, low noise (–120 dBV), and 100-year data retention are required in industrial temperature range (–40°C to +85°C) designs.

Technical Context

The X9317WM8I uses a 7-bit up/down counter decoded to select one of 100 wiper positions across a monolithic resistor ladder. Its control logic responds to CS (chip select), U/D (direction), and edge-triggered INC (increment) signals, enabling deterministic wiper movement without clock or address bus overhead.

Wiper position is stored into nonvolatile memory on CS↑ while INC = HIGH, and automatically recalled at power-up. The "make-before-break" switching ensures continuity during transitions, and the 200Ω typical wiper resistance (at 5V) and ±300 ppm/°C total resistance TC support stable analog signal conditioning under thermal variation.

Key Specifications

Pinout & Package

Package: 8-lead MSOP (RoHS-compliant, M8.118 drawing, –40°C to +85°C industrial grade).

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 X9317WM8I uniquely combines 100-tap resolution, true power-up recall, and 3-wire simplicity-making it optimal for cost-sensitive industrial systems where deterministic startup behavior and minimal MCU intervention are design priorities.

Availability

X9317WM8I is available at Aetrix Electronics and suitable for LCD bias control, laser diode biasing, voltage regulator trimming, and precision DC offset adjustment requiring stable component supply across industrial temperature ranges and long product lifecycles.

Supply support for X9317WM8I 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.

The X9317 family was designed specifically for analog trimming tasks requiring nonvolatile setting retention, low power, and mechanical potentiometer replacement in space-constrained industrial systems.

FAQ

What is the operating temperature range for the X9317WM8I?

The X9317WM8I is rated for –40°C to +85°C, qualifying it for industrial-grade applications such as motor control interfaces, sensor signal conditioning, and programmable power supplies. This range is confirmed in the Ordering Information table (page 2 of FN8183 Rev.10.01) for part numbers ending in "I", including X9317WM8I and its tape-and-reel variant X9317WM8IZT1. The device maintains full electrical specifications-including 100-tap resolution, ±20% RTOTAL tolerance, and nonvolatile recall-across this entire span.

Does the X9317WM8I require an external clock or microcontroller to operate?

No, the X9317WM8I operates autonomously using only three digital control lines: CS, U/D, and INC. It contains an integrated 7-bit up/down counter and decoder, eliminating the need for an external clock source or microcontroller firmware. Toggling INC while CS is LOW increments or decrements the wiper position based on the U/D logic level. This self-contained architecture makes the X9317WM8I ideal for simple trimming tasks in resource-constrained systems where adding SPI or I²C peripherals is impractical.

How is wiper position stored and recalled in the X9317WM8I?

Wiper position is stored into nonvolatile memory when CS transitions HIGH while INC is held HIGH-a dedicated store command that takes 5–10 ms to complete. Upon subsequent power-up, the X9317WM8I automatically recalls the last stored value and sets the wiper to that tap position within 5 µs. This behavior is intrinsic to the X9317WM8I's architecture and requires no external components or initialization code, ensuring repeatable analog settings across power cycles without MCU involvement.

What package type does the X9317WM8I use, and is it RoHS-compliant?

The X9317WM8I uses an 8-lead MSOP package (package drawing M8.118), measuring 3.0 mm × 3.0 mm × 1.1 mm with 0.65 mm lead pitch. It is fully RoHS-compliant and Pb-free, as stated in the Ordering Information table and confirmed by the "Pb-free (RoHS compliant)" feature bullet on page 1 of FN8183 Rev.10.01. The MSOP footprint provides compact board area while maintaining hand-solderability and compatibility with standard reflow profiles, including JEDEC J-STD-020-compliant Pb-free reflow.

Can the X9317WM8I be used as both a potentiometer and a rheostat?

Yes, the X9317WM8I supports both configurations. As a three-terminal potentiometer, RH and RL connect to fixed potentials (e.g., VCC and GND), while RW provides a variable voltage divider output. As a two-terminal rheostat, either RH or RL is left unconnected, and RW + the remaining terminal form a variable resistance-commonly used for gain control or current limiting. The datasheet explicitly confirms this dual-mode operation on page 1 ("used as a three-terminal potentiometer for voltage control or as a two-terminal variable resistor for current control") and illustrates both topologies in Figures 3 and 4.