Renesas X9315WMIZ

Overview

X9315WMIZ from Intersil is a digitally controlled potentiometer (XDCP™) implementing a 31-element resistor array with 32 wiper tap points, nonvolatile wiper position storage, and 3-wire serial interface (CS/U/D/INC). It operates at 2.7V to 5.5V, delivers ±20% end-to-end resistance tolerance, and supports industrial temperature range (–40°C to +85°C) in an 8-lead MSOP package. It functions as a solid-state replacement for mechanical potentiometers in precision analog trimming applications.

For engineers reviewing the X9315WMIZ datasheet, X9315WMIZ pinout, X9315WMIZ application, or X9315WMIZ equivalent, this page provides verified technical context, exact pin roles, confirmed RTOTAL = 10kΩ, wiper resistance ≤400Ω at 5V, noise performance of –120 dBV, and validated alternatives for analog signal conditioning, power supply feedback, and sensor calibration circuits.

Technical Context

The X9315WMIZ uses a 5-bit up/down counter driving a decoder that selects one of 32 wiper positions across a monolithic 31-resistor ladder. Wiper movement follows make-before-break switching, preventing open-circuit transients during tap transitions. The device stores wiper position in nonvolatile EEPROM upon CS↑ while INC = HIGH, enabling automatic recall at power-up.

It supports two primary configurations: three-terminal voltage divider (RH/VH–RW/VW–RL/VL) and two-terminal variable resistor (RH/VH–RW/VW or RW/VW–RL/VL). Terminal voltages are rail-to-rail (0 to VCC), and wiper series resistance is 200Ω typical at VCC = 5V - critical for minimizing loading error in high-impedance feedback paths.

Key Specifications

Pinout & Package

Package: 8-lead MSOP (Pb-free), JEDEC MO-187AA compliant, dimensions 3.0mm × 3.0mm × 0.85mm (M8.118).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5175BRMZ-10 and MCP41010-I/P, the X9315WMIZ offers deterministic power-up behavior via nonvolatile storage, lower tempco for stable gain, and simpler 3-wire control - making it optimal for unattended industrial systems requiring guaranteed startup state and long-term calibration integrity.

Availability

X9315WMIZ is available at Aetrix Electronics and suitable for power supply feedback trimming, sensor offset calibration, audio volume control, and programmable gain amplifier applications requiring stable component supply, RoHS-compliant packaging, and industrial temperature support.

Supply support for X9315WMIZ 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

Intersil Corporation (now part of Renesas Electronics) is a U.S.-based semiconductor company specializing in precision analog, power management, and interface ICs for industrial, communications, and computing markets.

The X9315WMIZ belongs to Intersil's XDCP™ (eXternally Digitally Controlled Potentiometer) family, designed specifically for replacing mechanical potentiometers in analog signal conditioning, power regulation, and sensor interface circuits where reliability, programmability, and nonvolatile setting retention are essential.

FAQ

What is the maximum wiper current rating for the X9315WMIZ?

The X9315WMIZ has a maximum wiper current rating of ±3.75mA under recommended operating conditions. This limit ensures safe operation without exceeding the 10mW maximum power rating or causing irreversible resistance drift. Exceeding this current may degrade wiper contact integrity over time, especially during frequent position changes. The X9315WMIZ wiper resistance of ≤400Ω at 5V further constrains usable voltage differential across the wiper terminals.

Does the X9315WMIZ retain its wiper position after power cycling?

Yes, the X9315WMIZ automatically recalls its last stored wiper position from nonvolatile memory upon power-up. This behavior is guaranteed because the device writes the current counter value to EEPROM whenever CS transitions HIGH while INC is held HIGH - a process requiring 5–10ms. Once stored, the position remains intact for up to 100 years, making the X9315WMIZ suitable for applications requiring deterministic startup states without MCU intervention.

Can the X9315WMIZ operate from a 3.3V supply?

Yes, the X9315WMIZ supports VCC from 2.7V to 5.5V, fully covering 3.3V nominal supplies. At 3.3V, its active current remains ≤80µA, standby current ≤5µA, and wiper resistance increases to ≤1000Ω (per datasheet specifications). All logic thresholds scale proportionally, so standard 3.3V CMOS GPIOs can directly drive CS, U/D, and INC without level shifting - simplifying integration with modern microcontrollers.

What is the meaning of "make-before-break" switching in the X9315WMIZ?

"Make-before-break" means the X9315WMIZ briefly connects two adjacent tap points to the wiper terminal during position transitions, preventing momentary open-circuit conditions. This avoids glitches in op-amp feedback loops or unintended signal interruptions in analog paths. However, it also causes a temporary reduction in effective RTOTAL when moving multiple steps rapidly - a design consideration reflected in the tIW (INC to VW change) specification of 1–5µs.

How does the X9315WMIZ differ from the X9315WMIZ-2.7 variant?

The X9315WMIZ-2.7 variant is explicitly characterized for VCC = 2.7V to 5.5V operation, whereas the standard X9315WMIZ is specified for 5V ±10% (4.5V–5.5V). Both share identical 10kΩ RTOTAL, 32-tap architecture, MSOP-8 package, and –40°C to +85°C temperature range. The -2.7 suffix indicates extended low-voltage validation - confirming reliable operation down to 2.7V, including timing margins and wiper resistance behavior - making it preferable for battery-powered systems with aging cells.