Renesas X9317UP

Overview

X9317UP from Renesas Electronics is a digitally controlled potentiometer (XDCP™) implementing a 99-element resistor array with 100 discrete wiper tap positions, nonvolatile wiper position storage, and 3-wire up/down serial interface. It functions as a solid-state replacement for mechanical potentiometers in precision analog trimming circuits operating from 2.7V to 5.5V supply, with ±20% end-to-end resistance tolerance and <5µA standby current.

For engineers reviewing the X9317UP datasheet, X9317UP pinout, X9317UP application, or X9317UP equivalent, this device supports voltage divider and variable resistor configurations in DC bias adjustment, laser diode bias control, gain/offset trim, and LCD bias circuits - requiring confirmation of RH/RW/RL terminal roles, wiper resistance (200–400Ω), and nonvolatile store timing (5–10ms).

Technical Context

The X9317UP integrates a 7-bit up/down counter, decoder, and nonvolatile memory to control wiper position across 100 taps. Its "make-before-break" switching ensures continuity during wiper transitions, while temperature-compensated resistor elements deliver ±300 ppm/°C total resistance drift and ±20 ppm/°C ratiometric stability.

Control relies on three dedicated digital inputs: CS (chip select, active-low), U/D (direction), and INC (negative-edge-triggered increment). Wiper position is stored to nonvolatile memory only when CS rises while INC is high, enabling power-up recall without external configuration.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5204BRUZ10 and MCP41010-I/P, the X9317UP offers unique single-channel simplicity, guaranteed power-up wiper recall without host intervention, and a minimal 3-wire interface - making it optimal for cost-sensitive, single-trim applications where deterministic startup behavior is essential.

Availability

X9317UP is available at Aetrix Electronics and suitable for LCD bias control, laser diode bias adjustment, gain/offset trim, and voltage regulator output programming requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for X9317UP 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 Corporation is a global semiconductor leader delivering microcontrollers, analog power, and SoC solutions for automotive, industrial, and infrastructure markets.

The X9317UP belongs to Renesas' XDCP™ (eXternally Digitally Controlled Potentiometer) family, engineered specifically for high-reliability analog trimming in space-constrained, low-power embedded systems where mechanical potentiometer wear and calibration drift are unacceptable.

FAQ

What is the supply voltage range supported by the X9317UP?

The X9317UP operates from 2.7V to 5.5V, covering both 3.3V and 5V system rails. This range is explicitly specified in the Absolute Maximum Ratings and Potentiometer Specifications sections of the FN8183 datasheet. The device maintains full functionality-including wiper movement, nonvolatile store, and linearity-across this entire voltage window under industrial temperature conditions (–40°C to +85°C). Operation outside this range may cause undefined behavior or damage.

Does the X9317UP retain its wiper position after power cycling?

Yes, the X9317UP stores the last wiper position in nonvolatile memory and automatically recalls it upon power-up. This behavior is guaranteed by the integrated EEPROM-like memory block, which retains data for 100 years and withstands 100,000 write cycles. The recall occurs within 5µs after VCC stabilizes, ensuring deterministic startup without host MCU involvement - a key differentiator from volatile digital potentiometers like the MCP41010-I/P.

How does the 3-wire interface of the X9317UP differ from SPI or I²C protocols?

The X9317UP uses a proprietary 3-wire up/down interface (CS, U/D, INC) instead of SPI or I²C. It requires no clock or data lines: wiper position is incremented or decremented on each negative edge of INC, with direction controlled by the static U/D logic level. This eliminates protocol overhead, reduces MCU GPIO count, and avoids timing constraints associated with serial clock edges - simplifying firmware and improving robustness in electrically noisy environments.

What is the maximum wiper current rating for the X9317UP?

The X9317UP specifies a maximum wiper current (IW) of ±4.4mA, measured as the current flowing through the RW terminal. This limit applies regardless of whether the device is used as a three-terminal potentiometer or two-terminal variable resistor. Exceeding this value risks altering wiper resistance or degrading long-term reliability. For higher current applications, external buffering (e.g., op-amp follower) is recommended to isolate the X9317UP from load demands.

Can the X9317UP be used in a two-terminal variable resistor configuration?

Yes, the X9317UP supports two-terminal operation by connecting either RH or RL to RW (shorting one fixed terminal to the wiper), effectively creating an adjustable resistance between RW and the remaining terminal. In this mode, the usable resistance range is 0Ω to RTOTAL (50kΩ), with wiper resistance (200–400Ω) contributing to minimum on-resistance. This configuration is validated in Figure 4 of the FN8183 datasheet and commonly applied in laser diode bias and current-source trimming.