Renesas X9317WM8I-2.7T1

Overview

X9317WM8I-2.7T1 from Renesas Electronics is a digitally controlled potentiometer (XDCP™) with 100 wiper tap points, nonvolatile wiper position storage, and 10 kΩ end-to-end resistance. It operates from 2.7 V to 5.5 V, consumes <5 µA standby current, and uses a 3-wire up/down interface for voltage divider or variable resistor applications in precision analog trimming.

For engineers reviewing the X9317WM8I-2.7T1 datasheet, X9317WM8I-2.7T1 pinout, X9317WM8I-2.7T1 application, or X9317WM8I-2.7T1 equivalent, this device supports low-noise DC bias adjustment, laser diode bias control, and gain/offset trim where power efficiency, temperature-stable resistance, and power-up repeatability are critical.

Technical Context

The X9317WM8I-2.7T1 implements a 99-element resistor array with make-before-break wiper switching, enabling glitch-free tap transitions. Its 7-bit counter drives a decoder that selects one of 100 wiper positions, with position stored in nonvolatile memory and recalled automatically at power-up.

Control logic responds to CS (chip select), U/D (direction), and edge-triggered INC inputs. The device supports both three-terminal potentiometer (voltage divider) and two-terminal variable resistor (current control) configurations, with RH, RL, and RW terminals electrically equivalent to mechanical potentiometer terminals.

Key Specifications

Pinout & Package

Package: 8-lead MSOP (RoHS-compliant, M8.118 drawing), -40°C to +85°C operating temperature range.

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 X9317WM8I-2.7T1 provides guaranteed power-up repeatability without host intervention, lower standby current (<5 µA vs. >10 µA), and tighter ratiometric temperature coefficient (±20 ppm/°C vs. ≥100 ppm/°C), making it optimal for unattended or low-power analog calibration.

Availability

X9317WM8I-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 calibration retention, and industrial temperature operation.

Supply support for X9317WM8I-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 X9317 family is designed for precision analog trimming in space-constrained, low-power systems where mechanical potentiometer replacement, calibration repeatability, and temperature stability are essential.

FAQ

What is the operating temperature range for the X9317WM8I-2.7T1?

The X9317WM8I-2.7T1 is rated for -40°C to +85°C operation, validated across all electrical specifications including end-to-end resistance tolerance, wiper resistance, and nonvolatile memory endurance. This industrial-grade range ensures reliable performance in embedded controllers, optical modules, and industrial sensors where ambient conditions vary widely. The X9317WM8I-2.7T1 maintains ±20 ppm/°C ratiometric temperature coefficient across this full span.

How does the X9317WM8I-2.7T1 store and recall wiper position?

The X9317WM8I-2.7T1 stores wiper position in nonvolatile memory when CS transitions HIGH while INC is held HIGH. Upon power-up, the stored value is automatically loaded into the wiper counter within 5 µs, setting RW to the last-saved tap. No external controller or initialization sequence is required. This behavior is intrinsic to the X9317WM8I-2.7T1 architecture and applies regardless of supply ramp rate or sequencing, provided VCC reaches final value.

Can the X9317WM8I-2.7T1 be used as a two-terminal variable resistor?

Yes, the X9317WM8I-2.7T1 supports two-terminal operation by connecting either RH or RL to RW externally (e.g., short RH to RW for low-side variable resistance). In this mode, the device functions as a digitally adjustable rheostat with 100-step resolution and 10 kΩ maximum resistance. Wiper current rating remains ±4.4 mA, and temperature coefficients apply identically. The X9317WM8I-2.7T1 datasheet explicitly validates this configuration in Figure 4 and Applications Information.

What is the maximum wiper current rating for the X9317WM8I-2.7T1?

The X9317WM8I-2.7T1 specifies a maximum wiper current (IW) of ±4.4 mA under all operating conditions, verified across -40°C to +85°C. Exceeding this limit risks accelerated wear of the wiper switch network and may degrade long-term endurance below the rated 100,000 cycles. This rating applies independently of supply voltage (2.7 V to 5.5 V) and is measured with RH and RL biased at VCC and VSS respectively. The X9317WM8I-2.7T1's 200 Ω typical wiper resistance contributes to safe current limiting in most divider configurations.

Does the X9317WM8I-2.7T1 require a specific power-up sequence?

Yes - to prevent unintended wiper movement or spurious store operations, the X9317WM8I-2.7T1 requires CS and INC to be held HIGH before or concurrently with VCC ramp-up. The device becomes fully functional 1 ms after VCC stabilizes, but wiper position is stable within 5 µs of power-up completion. Bringing CS/INC high first ensures the control logic remains inactive until supply is valid. This sequence is mandatory for reliable X9317WM8I-2.7T1 operation and is documented in the Power-up and Down Requirements section.