Analog Devices Inc./Maxim Integrated DS3502U+T&R/C

Overview

DS3502U+T&R/C from Maxim Integrated is a 7-bit nonvolatile digital potentiometer with I²C interface, 10kΩ end-to-end resistance, ±4 ppm/°C ratiometric tempco, and 15.5V analog voltage range-designed for precision VCOM calibration in TFT-LCD panels where stable high-voltage wiper control and EEPROM-retained settings are required.

For engineers reviewing the DS3502U+T&R/C datasheet, DS3502U+T&R/C pinout, DS3502U+T&R/C application, or DS3502U+T&R/C equivalent, key selection criteria include its 128-tap resolution, dual supply operation (2.5–5.5V digital / 4.5–15.5V analog), -40°C to +100°C industrial temperature range, and support for up to four devices on one I²C bus via A0/A1 address pins.

Technical Context

The DS3502U+T&R/C implements a resistor ladder with 127 series segments between RH and RL pins, controlled by a 7-bit wiper register (WR) that directly sets RW terminal voltage in a ratiometric divider configuration. Its nonvolatile memory stores both wiper position and initial power-up value (IVR), with automatic recall at power-on when VCC exceeds 1.2V.

I²C communication operates at up to 400kHz fast-mode timing, with address decoding based on A0/A1 logic levels yielding slave addresses 50h–53h. The MODE bit in Control Register 02h enables volatile-only writes to WR (MODE=1) or simultaneous WR/IVR updates (MODE=0), decoupling SRAM adjustment from EEPROM endurance cycles.

Key Specifications

Pinout & Package

DS3502U+T&R/C is housed in a 10-pin µSOP package (3.0mm × 3.0mm, 0.5mm pitch) with exposed pad for thermal performance and RoHS compliance (+ suffix). Pin functions are validated per Maxim's official pin description table and functional diagram.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5170BRMZ-10 and MCP45HV51-103E/MS, the DS3502U+T&R/C uniquely combines native 15.5V analog operation, EEPROM-retained wiper state, and I²C address flexibility-making it the only option qualified for direct, maintenance-free VCOM calibration in high-reliability TFT-LCD modules.

Availability

DS3502U+T&R/C is available at Aetrix Electronics and suitable for TFT-LCD VCOM calibration, industrial instrumentation gain trim, and mechanical potentiometer replacement requiring stable component supply, tape-and-reel packaging for automated assembly, and guaranteed long-term availability.

Supply support for DS3502U+T&R/C 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) designs precision analog and mixed-signal ICs for industrial, communications, and consumer applications, with emphasis on high-reliability, low-power, and integrated functionality.

The DS3502U+T&R/C belongs to Maxim's high-voltage digital potentiometer product line, engineered specifically for display bias control and precision analog trimming where nonvolatile storage, wide voltage range, and I²C configurability are mandatory.

FAQ

What is the maximum analog voltage the DS3502U+T&R/C can handle on its RH, RL, and RW pins?

The DS3502U+T&R/C supports an analog voltage range of -0.5V to +15.5V on RH, RL, and RW pins relative to GND, with V+ required to be ≥4.5V and ≥VCC. This enables direct connection to TFT-LCD VCOM rails without external level-shifting circuitry, and the device maintains specified performance across its full -40°C to +100°C operating temperature range.

Does the DS3502U+T&R/C retain its wiper setting after power cycling?

Yes, the DS3502U+T&R/C retains its wiper setting after power cycling using on-chip EEPROM. At power-up, the Initial Value Register (IVR) contents are automatically loaded into the Wiper Register (WR), restoring the last stored position. The EEPROM is rated for 200,000 write cycles at +25°C and guarantees data retention for 40 years under normal operating conditions.

How many DS3502U+T&R/C devices can share the same I²C bus?

Up to four DS3502U+T&R/C devices can share the same I²C bus using the A0 and A1 address select pins, which configure the two least-significant bits of the 7-bit slave address (01010xx). This yields unique addresses 50h, 51h, 52h, and 53h-enabling multi-channel VCOM calibration in large-format displays without bus contention.

What is the purpose of the separate V+ and VCC supply pins on the DS3502U+T&R/C?

V+ supplies the analog section (RH, RL, RW) and must be ≥4.5V and ≤15.5V, while VCC powers the digital logic (I²C interface, registers) and operates from 2.5V to 5.5V. This dual-supply architecture isolates high-voltage analog operation from low-voltage digital control-preventing noise coupling and enabling independent optimization of each domain's power integrity.

Can the DS3502U+T&R/C be used in automotive display applications?

Yes, the DS3502U+T&R/C is suitable for automotive display applications due to its -40°C to +100°C operating temperature range, 15.5V analog voltage capability matching typical VCOM rail requirements, and robust I²C interface with built-in pulse-width suppression. While not AEC-Q200 certified as a complete device, its µSOP package and electrical specifications align with Tier-1 automotive display module design practices.