Renesas X9317WV8Z

Overview

X9317WV8Z 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, and supports voltage divider or variable resistor configurations in precision analog trimming applications.

For engineers reviewing the X9317WV8Z datasheet, X9317WV8Z pinout, X9317WV8Z application, or X9317WV8Z equivalent, this device serves as a solid-state replacement for mechanical potentiometers where repeatable, temperature-stable, and power-up-recoverable resistance adjustment is required - especially in LCD bias control, laser diode biasing, and DC offset trim circuits.

Technical Context

The X9317WV8Z 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 temperature coefficient.

Control is executed via three dedicated digital inputs: CS (chip select), U/D (direction), and INC (edge-triggered increment). Wiper position is stored in nonvolatile memory only when CS rises while INC is high - enabling deterministic power-up behavior without unintended writes during system initialization.

Key Specifications

Pinout & Package

Package: 8-lead TSSOP (RoHS-compliant, JEDEC MO-153 AC, pkg drawing M8.173, body size 4.4 mm × 3.0 mm × 1.2 mm max).

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 X9317WV8Z uniquely combines guaranteed power-up wiper recall, ultra-low standby current (<5 µA), and a minimal 3-wire interface - making it optimal for self-contained, low-power, calibration-critical analog subsystems without host processor supervision.

Availability

X9317WV8Z is available at Aetrix Electronics and suitable for LCD bias control, laser diode biasing, and voltage regulator output trimming requiring stable component supply, long-term calibration retention, and commercial-temperature-grade reliability.

Supply support for X9317WV8Z 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 enterprise applications.

The X9317WV8Z belongs to Renesas' XDCP™ (Digitally Controlled Potentiometer) family, designed specifically for replacing mechanical trimmers in precision analog signal conditioning, bias control, and calibration-critical embedded systems.

FAQ

What is the default wiper position of the X9317WV8Z after power-up?

The X9317WV8Z restores the last wiper position stored in nonvolatile memory upon power-up - not a fixed default. If no prior store has occurred, it powers up at the position last written before initial power-down. This behavior is guaranteed by the device's architecture and requires no external initialization code. The X9317WV8Z does not reset to mid-scale or zero unless explicitly programmed to do so and stored.

Can the X9317WV8Z operate reliably at 2.7V supply voltage?

Yes, the X9317WV8Z is fully specified for operation from 2.7 V to 5.5 V, including all electrical parameters such as wiper resistance (400 Ω typical at 2.7 V), active current (≤80 µA), and timing (tCYC ≤ 2 µs). The "-2.7" suffix in ordering variants like X9317WV8Z-2.7T1 explicitly denotes qualification across this extended low-voltage range, making it suitable for battery-powered and energy-harvesting applications.

Does the X9317WV8Z require external pull-up or pull-down resistors on its control pins?

No, the X9317WV8Z does not require external biasing on CS, U/D, or INC inputs. Its VIH and VIL thresholds are defined relative to VCC (VIH ≥ 0.7×VCC, VIL ≤ 0.1×VCC), and input leakage is limited to ±10 µA. Direct connection to CMOS logic outputs is sufficient. Adding external resistors may interfere with edge-sensitive INC timing or cause unintended wiper movement during power sequencing.

How does the "make-before-break" switching affect circuit behavior during wiper movement?

The X9317WV8Z connects adjacent taps momentarily during wiper transitions, preventing open-circuit conditions that could disrupt feedback loops or cause output glitches. However, moving multiple positions rapidly can briefly reduce effective RTOTAL - for example, bridging five elements lowers resistance by ~5% transiently. For critical regulation paths, limit step size or allow tIW (≤5 µs) settling time before sampling RW voltage.

Is the X9317WV8Z pin-compatible with other members of the X9317 family?

Yes, all X9317 variants - including X9317WV8Z (TSSOP), X9317WS8Z (SOIC), and X9317WM8Z (MSOP) - share identical 8-pin pinout and electrical interface. Mechanical package dimensions differ, but PCB layout can be reused across variants with appropriate land pattern adjustments. This enables drop-in substitution for thermal, space, or assembly process optimization without schematic or firmware changes.