Renesas X9317WS8I

Overview

X9317WS8I 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 operates from 2.7V to 5.5V, delivers ±20% end-to-end resistance tolerance, and supports voltage divider or variable resistor configurations in precision analog trimming applications.

For engineers reviewing the X9317WS8I datasheet, X9317WS8I pinout, X9317WS8I application, or X9317WS8I equivalent, this device serves as a solid-state replacement for mechanical potentiometers in DC bias adjustment, laser diode bias control, gain/offset trim, and voltage regulator output tuning-requiring stable wiper position retention across power cycles and low standby current (<5 µA).

Technical Context

The X9317WS8I integrates a 7-bit up/down counter, decoder, and nonvolatile memory to control wiper position across 100 discrete taps. Its resistor array uses temperature-compensated elements with ±300 ppm/°C total resistance TC and ±20 ppm/°C ratiometric TC, ensuring stable voltage division under thermal variation.

Wiper movement follows make-before-break switching, enabling glitch-free transitions; stored wiper values are recalled automatically at power-up. The 3-wire interface (CS, U/D, INC) requires no clock or data lines beyond these three signals, simplifying host MCU GPIO usage while supporting both volatile adjustment and nonvolatile store operations.

Key Specifications

Pinout & Package

Package: 8-lead SOIC (RoHS-compliant, M8.15E footprint, -40°C to +85°C industrial temperature range).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5175BRMZ-10 and MCP41HV51-103, the X9317WS8I offers lowest GPIO count (3 pins), lowest standby current (<5 µA), and guaranteed power-up recall without firmware initialization-making it optimal for cost-sensitive, low-power, and safety-critical trimming where minimal interface overhead is essential.

Availability

X9317WS8I is available at Aetrix Electronics and suitable for LCD bias control, laser diode bias control, and voltage regulator output tuning requiring stable component supply, guaranteed RoHS compliance, and industrial temperature support (-40°C to +85°C).

Supply support for X9317WS8I 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 infrastructure markets.

The X9317WS8I belongs to Renesas' XDCP™ (Digitally Controlled Potentiometer) family, designed specifically for replacing mechanical trimmers in precision analog signal conditioning, bias control, and calibration-critical systems.

FAQ

What is the operating temperature range for the X9317WS8I?

The X9317WS8I is rated for industrial operation from -40°C to +85°C, as confirmed in the Ordering Information table (X9317WS8IZ and X9317WS8IZT1 variants). This range applies to all electrical specifications including end-to-end resistance tolerance, wiper resistance, and nonvolatile memory endurance. The device meets JEDEC standards for plastic SOIC packages and is qualified for use in automotive cabin electronics and industrial control modules.

Does the X9317WS8I require external components to function as a voltage divider?

No, the X9317WS8I operates as a complete three-terminal potentiometer without external components. Its internal 99-element resistor array, RH–RW–RL terminals, and integrated wiper switch network allow direct implementation of voltage dividers (e.g., Figure 3 in FN8183). Only VCC, VSS, and the three control signals (CS, U/D, INC) are needed - no decoupling capacitors or pull-ups are mandatory for basic operation.

How is wiper position stored and recalled in the X9317WS8I?

Wiper position is stored in nonvolatile memory when CS transitions from low to high while INC is held high. Upon power-up, the X9317WS8I automatically recalls the last stored value and configures RW to that tap position within 5 µs (tPU). This behavior is guaranteed across the full -40°C to +85°C range and requires no host MCU intervention, enabling "set-and-forget" calibration in field-deployed equipment.

What is the maximum wiper current rating for the X9317WS8I?

The X9317WS8I specifies a maximum wiper current (IW) of ±4.4 mA, measured with RH and RL biased between VSS and VCC. At 2.7 V supply, wiper resistance rises to ≤1000 Ω, limiting current under worst-case voltage differentials. This rating supports use in low-current bias networks (e.g., op-amp offset null, laser diode monitor paths) but excludes high-power rheostat applications.

Can the X9317WS8I be used in a two-terminal variable resistor configuration?

Yes, the X9317WS8I supports two-terminal operation by connecting either RH or RL to RW (leaving the other fixed terminal unconnected), forming a variable resistor between RW and the active fixed terminal. This configuration is explicitly validated in the datasheet (Figure 4) and used in applications like gain-setting resistors and current-limiting elements, with RTOTAL = 10 kΩ and wiper resistance contributing directly to total path resistance.