Renesas X9317WV8I

Overview

X9317WV8I 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 three-terminal voltage divider or two-terminal variable resistor for precision analog trimming in DC bias, gain/offset, and regulator output control circuits operating from 2.7V to 5.5V.

For engineers reviewing the X9317WV8I datasheet, X9317WV8I pinout, X9317WV8I application, or X9317WV8I equivalent, key selection criteria include its ±20% end-to-end resistance tolerance, 200Ω typical wiper resistance at 5V, -40°C to +85°C industrial temperature range, 100-year data retention, and TSSOP-8 RoHS-compliant package.

Technical Context

The X9317WV8I integrates a 7-bit up/down counter, decoder, and nonvolatile memory to control wiper position across 100 discrete taps. Its "make-before-break" switching ensures continuity during wiper transitions, while the resistor array exhibits ±300 ppm/°C total resistance temperature coefficient and ±20 ppm/°C ratiometric coefficient.

Control is implemented via CS (chip select), U/D (direction), and edge-triggered INC inputs. Wiper position is stored in nonvolatile memory only when CS rises while INC is high - a dedicated store command distinct from normal operation - enabling deterministic power-up recall without unintended writes.

Key Specifications

Pinout & Package

Package: 8-lead TSSOP (RoHS-compliant, JEDEC MO-153 AC, M8.173 drawing), 4.4mm × 3.0mm body, 0.65mm pitch, 1.20mm max height.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5243BRMZ10 and MCP4018T-E/OT, the X9317WV8I uniquely guarantees deterministic power-up behavior via nonvolatile storage, delivers tighter ±20% resistance tolerance for absolute voltage accuracy, and uses a minimal 3-wire interface compatible with GPIO-only microcontrollers - making it optimal for industrial systems requiring field-adjustable, self-restoring analog calibration.

Availability

X9317WV8I is available at Aetrix Electronics and suitable for LCD bias control, laser diode biasing, voltage regulator programming, and precision DC offset trimming requiring stable component supply across extended industrial temperature ranges and long production lifecycles.

Supply support for X9317WV8I 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 X9317 family was designed specifically for high-reliability analog trimming in industrial and telecom equipment, emphasizing nonvolatile persistence, temperature-stable ratiometric performance, and robust 3-wire control simplicity.

FAQ

What is the guaranteed power-up behavior of the X9317WV8I?

The X9317WV8I automatically recalls the last wiper position stored in nonvolatile memory upon power-up, ensuring repeatable analog settings without host intervention. This behavior is guaranteed across its -40°C to +85°C operating range and requires no external initialization sequence. The X9317WV8I achieves this via integrated EEPROM-like memory with 100-year data retention, making it ideal for unattended industrial systems where consistent startup conditions are mandatory.

Does the X9317WV8I require external decoupling capacitors?

Yes, the X9317WV8I requires a 0.1µF ceramic capacitor placed between VCC and VSS within 1cm of the package to suppress high-frequency noise and ensure stable wiper operation during INC transitions. This decoupling is critical because internal switching transients can couple into the resistor array without proper local bypassing, causing temporary RW voltage glitches that affect precision analog outputs. The X9317WV8I datasheet specifies this requirement in the Power-up and Down Requirements section.

Can the X9317WV8I be used in a two-terminal variable resistor configuration?

Yes, the X9317WV8I supports two-terminal operation by connecting either RH or RL to RW, effectively using the wiper and one fixed terminal as a programmable resistor. In this mode, the device provides 100 discrete resistance values from near-zero (tap 0 or 99) to 10kΩ ±20%, with wiper resistance adding ~200Ω in series. This configuration is commonly used for gain-setting in transimpedance amplifiers or current-limiting in LED drivers, and the X9317WV8I's make-before-break switching prevents open-circuit faults during adjustment.

What is the maximum allowable voltage across RH and RL terminals of the X9317WV8I?

The X9317WV8I specifies an absolute maximum voltage of +6V across RH and RL terminals with respect to VSS. However, for reliable operation within datasheet limits, the voltage difference between RH and RL must not exceed the supply voltage VCC (2.7V to 5.5V), as the internal resistor array is powered solely from VCC/VSS. Exceeding VCC risks forward-biasing protection diodes and degrading long-term reliability. This constraint is explicitly defined in the Absolute Maximum Ratings table of the X9317WV8I datasheet.

How does the X9317WV8I handle wiper movement during rapid INC toggling?

When INC is toggled rapidly, the X9317WV8I's internal 7-bit counter increments or decrements synchronously with each negative edge, and the decoder activates corresponding wiper switches with a typical 1µs delay (tIW). During multi-step movement, "make-before-break" switching briefly connects adjacent taps to RW, temporarily reducing effective resistance. The X9317WV8I datasheet warns that moving >5 taps consecutively may cause transient RTOTAL reduction - a design consideration for time-critical analog loops where momentary impedance collapse must be avoided.