Renesas X9315UMI

Overview

X9315UMI from Intersil is a digitally controlled potentiometer (XDCP™) implementing a 31-element resistor array with 32 wiper tap positions, nonvolatile memory for power-up recall, and 3-wire serial interface (CS/U/D/INC). It operates at 5V ±10%, delivers ±20% end-to-end resistance tolerance, and supports industrial temperature range (–40°C to +85°C) in an 8-lead MSOP package. It serves as a solid-state replacement for mechanical potentiometers in precision analog trimming applications.

For engineers reviewing the X9315UMI datasheet, X9315UMI pinout, X9315UMI application, or X9315UMI equivalent, this page provides verified technical context, confirmed pin functions, real-world use scenarios in signal conditioning and bias control, and validated alternative parts with documented functional differences.

Technical Context

The X9315UMI integrates a 5-bit up/down counter, nonvolatile EEPROM storage, and a decoder-driven wiper switching network across 31 resistive elements. Wiper position is updated on negative-edge transitions of INC while CS is low, with direction controlled by U/D logic level.

It features make-before-break wiper switching, temperature-compensated resistor array (±300 ppm/°C RTOTAL drift), and ratiometric tracking (±20 ppm/°C). The device enters standby mode (5 µA max) when CS is high and stores wiper position only when CS rises while INC is high.

Key Specifications

Pinout & Package

Package: 8-lead MSOP (M8.118), body dimensions 3.0 mm × 3.0 mm × 1.0 mm, RoHS-compliant matte tin termination, JEDEC MO-187AA compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5204BRUZ10 and MCP41050-I/P, the X9315UMI uniquely combines industrial temperature rating, 50 kΩ value, nonvolatile recall, and minimal 3-wire control-making it optimal for standalone, self-initializing analog trimming where reliability and simplicity outweigh multi-channel or SPI integration needs.

Availability

X9315UMI is available at Aetrix Electronics and suitable for industrial sensor calibration, programmable power supplies, and embedded audio systems requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for X9315UMI 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 semiconductor manufacturer specializing in high-performance analog and mixed-signal ICs for power management, precision analog, and interface applications.

The X9315UMI belongs to Intersil's XDCP™ (Digitally Controlled Potentiometer) product line, designed specifically for replacing mechanical potentiometers in industrial, medical, and communications equipment where reliability, programmability, and nonvolatile setting retention are critical.

FAQ

What is the exact end-to-end resistance value and tolerance of the X9315UMI?

The X9315UMI has a nominal end-to-end resistance (RTOTAL) of 50 kΩ with a tolerance of ±20% over temperature and process variation. This value is fixed per device variant and confirmed in the Ordering Information table of FN8179 Rev.2.00. The X9315UMI does not support programmable RTOTAL values-only wiper position is adjustable. Resistance drift remains within ±300 ppm/°C across –40°C to +85°C.

Does the X9315UMI retain its wiper position after power loss?

Yes, the X9315UMI retains its last stored wiper position in nonvolatile EEPROM memory for up to 100 years and automatically recalls it on power-up. Storage occurs only when CS transitions HIGH while INC is held HIGH-a deliberate, user-controlled action. Unstored adjustments remain volatile until explicitly saved. This behavior is intrinsic to the X9315UMI's architecture and verified in the Principles of Operation section of FN8179.

What package type and lead count does the X9315UMI use?

The X9315UMI uses an 8-lead Mini Small Outline Plastic (MSOP) package per JEDEC MO-187AA, with package drawing M8.118. Its dimensions are 3.0 mm × 3.0 mm × 1.0 mm, and it features matte tin (e3) RoHS-compliant terminations. This is distinct from SOIC or PDIP variants (e.g., X9315WSI or X9315WP) and is confirmed in the Ordering Information table for X9315UMI on page 2 of FN8179 Rev.2.00.

Can the X9315UMI operate from a 3.3 V supply?

No, the X9315UMI is specified only for 5 V ±10% operation (4.5 V to 5.5 V). It is not rated for 3.3 V operation. For 2.7–5.5 V compatibility, Intersil offers the X9315UMI-2.7 variant (e.g., X9315UMIZ-2.7T1), which shares the same 50 kΩ RTOTAL and MSOP package but has extended supply range. Using the standard X9315UMI below 4.5 V violates recommended operating conditions and may cause unreliable wiper movement or memory corruption.

How many wiper positions does the X9315UMI support, and what is the resolution?

The X9315UMI supports exactly 32 wiper tap positions, corresponding to a 5-bit counter (0–31). Resolution is defined as 1/31 of RTOTAL per step (≈3.23% of full scale), with absolute linearity error bounded to ±1 MI (Minimum Increment) and relative linearity to ±0.2 MI. This resolution is fixed and inherent to the 31-resistor-element architecture-no interpolation or additional granularity is available in the X9315UMI.