Renesas X9317WS8I-2.7T1

Overview

X9317WS8I-2.7T1 from Renesas Electronics is a digitally controlled potentiometer (XDCP™) with 100 wiper tap points, nonvolatile wiper position storage, and 2.7V to 5.5V supply operation. It implements a 99-element resistor array with temperature-compensated end-to-end resistance (±20% tolerance), low standby current (<5 µA), and operates as either a three-terminal voltage divider or two-terminal variable resistor - used in precision DC bias adjustment and laser diode bias control.

For engineers reviewing the X9317WS8I-2.7T1 datasheet, X9317WS8I-2.7T1 pinout, X9317WS8I-2.7T1 application, or X9317WS8I-2.7T1 equivalent, key selection criteria include its 10 kΩ end-to-end resistance, -40°C to +85°C industrial temperature range, SOIC-8 package, 3-wire up/down interface timing (tCYC = 2 µs), and nonvolatile store/reload behavior on power-up.

Technical Context

The X9317WS8I-2.7T1 integrates a 7-bit up/down counter, decoder, and nonvolatile memory to control wiper position across 99 resistive elements. Its "make-before-break" switching ensures glitch-free transitions during wiper movement, and the wiper terminal exhibits 200 Ω typical series resistance at 5 V and up to 1000 Ω at 2.7 V.

Operation relies on three digital inputs: CS (chip select, active-low), U/D (direction control), and INC (negative-edge-triggered increment). A HIGH-to-LOW transition on INC while CS is LOW moves the wiper; storing the position requires CS rising while INC is HIGH - initiating a 5–10 ms nonvolatile write cycle.

Key Specifications

Pinout & Package

Package: 8-lead narrow-body SOIC (RoHS-compliant, JEDEC MS-012, pkg drawing M8.15E), 4.90 mm × 3.90 mm × 1.75 mm max height.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5171BRMZ-10 and MCP41010-I/P, the X9317WS8I-2.7T1 delivers autonomous power-up operation without host intervention, simpler GPIO-based control, and guaranteed industrial temperature support - making it optimal for unattended or safety-critical analog trimming where deterministic startup behavior is essential.

Availability

X9317WS8I-2.7T1 is available at Aetrix Electronics and suitable for LCD bias control, laser diode bias control, and voltage regulator output control requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for X9317WS8I-2.7T1 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 X9317WS8I-2.7T1 belongs to Renesas' XDCP™ family of digitally controlled potentiometers, designed specifically for replacing mechanical trimmers in high-reliability, maintenance-free analog adjustment applications across industrial and communications equipment.

FAQ

What is the default wiper position of the X9317WS8I-2.7T1 after power-up?

The X9317WS8I-2.7T1 powers up with the wiper position recalled from nonvolatile memory - not a fixed default. If no prior store has occurred, the wiper initializes to the last stored value from the most recent successful NV write cycle. This behavior ensures repeatable startup conditions without requiring host initialization, a key advantage over volatile digital potentiometers like the MCP41010-I/P.

Does the X9317WS8I-2.7T1 support operation at 2.7 V supply, and how does it affect wiper resistance?

Yes, the X9317WS8I-2.7T1 is fully specified for 2.7 V to 5.5 V operation. At 2.7 V, wiper resistance increases to ≤1000 Ω (vs. ≤400 Ω at 5 V), which must be accounted for in low-impedance feedback paths. The device maintains full functionality - including 100-tap resolution, nonvolatile store, and timing specifications - across the entire voltage range.

How is nonvolatile storage triggered on the X9317WS8I-2.7T1, and what is the timing requirement?

Nonvolatile storage on the X9317WS8I-2.7T1 is triggered by a rising edge on CS while INC is held HIGH. This initiates a 5–10 ms internal write cycle (tWR), during which the current wiper position is latched into EEPROM. The device enters standby mode upon completion. No external command or clock is needed - the action is purely edge- and level-sensitive.

Can the X9317WS8I-2.7T1 be used in a two-terminal variable resistor configuration, and what are the design implications?

Yes, the X9317WS8I-2.7T1 supports two-terminal operation by connecting RH and RW (or RL and RW) as the variable element. In this mode, total resistance ranges from near-zero (wiper at terminal) to 10 kΩ (wiper at opposite end). Designers must consider wiper resistance (up to 1000 Ω at 2.7 V) as part of the effective series resistance, especially in current-sensing or low-voltage-drop applications.

What is the absolute linearity specification of the X9317WS8I-2.7T1, and how does it impact precision trimming?

The X9317WS8I-2.7T1 has ±1 MI absolute linearity, where 1 MI = (V(RH) − V(RL))/99. Over a 3.3 V span, this translates to ±33 mV maximum deviation from ideal voltage division - enabling accurate DC offset and gain trimming in 12-bit systems. Relative linearity of ±0.2 MI further ensures smooth step-to-step transitions critical for closed-loop calibration stability.