Analog Devices Inc./Maxim Integrated DS3501U+T&R/H

Overview

DS3501U+T&R/H from Maxim Integrated is a 7-bit, nonvolatile digital potentiometer with integrated temperature sensor, 36-byte lookup table (LUT), and I²C interface operating up to 400kHz. It delivers 128 wiper positions, 10kΩ end-to-end resistance, and supports analog voltage range up to +15.5V on RH/RL/RW - enabling precise VCOM calibration in TFT-LCD panels.

For engineers reviewing the DS3501U+T&R/H datasheet, DS3501U+T&R/H pinout, DS3501U+T&R/H application, or DS3501U+T&R/H equivalent, key selection considerations include its temperature-compensated LUT architecture, dual-voltage operation (2.7–5.5V digital / 4.5–15.5V analog), -40°C to +100°C industrial temperature range, and pin/software compatibility with ISL95311 in Default Mode.

Technical Context

The DS3501U+T&R/H operates in three configurable modes: Default Mode (WR/IVR-controlled, ISL95311-compatible), LUT Mode (temperature-indexed wiper lookup), and LUT Adder Mode (LUTVAL + IVR summation). Its on-chip 8-bit temperature sensor outputs signed two's complement data (±5°C accuracy) with 16ms conversion time, directly addressing the 36-byte NV LUT mapped across -37°C to ≥100°C in 4°C windows with 1°C hysteresis.

Control logic uses shadowed EEPROM-SRAM registers (CR0, CR1, CR2) to manage mode selection, standby enable (CR2.0), temperature update enable (CR2.2), and address update enable (CR2.1). The I²C interface supports up to four devices on one bus via A0/A1 address pins, with fast-mode timing (400kHz SCL), 0.6µs setup/hold, and 10–20ms EEPROM write time after STOP.

Key Specifications

Pinout & Package

DS3501U+T&R/H is housed in a 10-pin µSOP package (3.0mm × 3.0mm, 0.5mm pitch), optimized for space-constrained display and optical modules. Pin functions are validated per Maxim DS3501 Rev 0 datasheet (Jan 2007).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL95311IRZ-T and AD5171BRMZ-10, DS3501U+T&R/H uniquely integrates temperature sensing, LUT-based compensation, and high-voltage analog operation - eliminating external components and firmware overhead for thermal stability in display, optical, and industrial systems.

Availability

DS3501U+T&R/H is available at Aetrix Electronics and suitable for TFT-LCD VCOM calibration, optical transceiver bias control, and industrial sensor signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for DS3501U+T&R/H 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

Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in precision analog, mixed-signal, and high-reliability ICs for industrial, communications, and consumer applications.

The DS3501U+T&R/H belongs to Maxim's high-voltage digital potentiometer product line, designed specifically for applications demanding autonomous thermal compensation, nonvolatile calibration storage, and robust operation in harsh environmental conditions.

FAQ

What is the maximum analog voltage the DS3501U+T&R/H can handle on its RH, RL, and RW pins?

The DS3501U+T&R/H supports an analog voltage range of +4.5V to +15.5V on RH, RL, and RW pins relative to GND. Absolute maximum rating is +17V on V+, with voltage across RH and RL limited to -0.5V to V+. This enables direct integration into high-voltage display bias and optical module circuits without level-shifting circuitry.

How does the DS3501U+T&R/H implement temperature compensation without external components?

The DS3501U+T&R/H implements autonomous temperature compensation using its on-chip 8-bit temperature sensor and 36-byte nonvolatile lookup table (LUT). The sensor measures die temperature every 16ms, calculates an index into the LUT, and automatically loads the corresponding wiper value - all without MCU involvement in LUT or LUT Adder Mode.

Is the DS3501U+T&R/H pin-compatible with the ISL95311 in all operating modes?

The DS3501U+T&R/H is pin and software compatible with the ISL95311 only in Default Mode (Update Mode bit = 0), where it mirrors register map, I²C timing, and wiper control behavior. In LUT and LUT Adder Modes, memory map and control register usage differ significantly - requiring firmware updates for full feature utilization.

What is the EEPROM endurance specification for the DS3501U+T&R/H's nonvolatile memory?

The DS3501U+T&R/H guarantees 200,000 write cycles for its nonvolatile memory at +25°C and 50,000 write cycles at +70°C. This endurance supports repeated field calibration updates over the product's operational lifetime, especially in applications requiring periodic recalibration due to aging or environmental exposure.

Can multiple DS3501U+T&R/H devices share the same I²C bus? How is addressing managed?

Yes, up to four DS3501U+T&R/H devices can share one I²C bus using the A0 and A1 address pins. These pins configure the two least-significant bits of the 7-bit slave address (01010A1A0X), yielding addresses 0x50–0x53. No external address translation or multiplexing is required - simplifying multi-channel calibration architectures.