Analog Devices Inc./Maxim Integrated DS1847B-010+T&R

Overview

DS1847B-010+T&R from Maxim Integrated is a dual temperature-controlled nonvolatile variable resistor IC featuring two 10kΩ, 256-position linear taper resistors with integrated 13-bit digital temperature sensor. It operates from 3.0V to 5.5V, supports 2-wire (I²C-compatible) interface, and stores resistor settings in EEPROM for temperature-compensated biasing in analog control circuits. Used in laser diode bias calibration and precision sensor signal conditioning.

For engineers reviewing the DS1847B-010+T&R datasheet, DS1847B-010+T&R pinout, DS1847B-010+T&R application, or DS1847B-010+T&R equivalent, key selection criteria include dual 10kΩ NV resistor matching, -40°C to +95°C operating range, 2°C temperature resolution, write-protect functionality, and 16-ball CSBGA packaging with lead-free tape-and-reel delivery.

Technical Context

The DS1847B-010+T&R implements a temperature-addressed look-up table architecture where each resistor's 256 positions map to discrete 2°C increments across -40°C to +95°C. Resistor values are updated automatically based on real-time 13-bit 2's complement temperature readings from the on-chip sensor, with hysteresis applied at transitions.

It functions as a slave device on a 2-wire bus supporting both standard (100kHz) and fast (400kHz) modes. Addressing uses A0–A2 pins (or internal register), while WP enables hardware write protection of EEPROM, configuration registers, and LUTs without blocking temperature updates.

Key Specifications

Pinout & Package

Package: 16-ball CSBGA (4mm × 4mm), lead-free, tape-and-reel delivery (T&R). Pinout validated per Maxim DS1847 datasheet Rev. 0, pages 2–3.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual NV resistor applications.

Compared with DS1847E-010+T&R, the DS1847B-010+T&R offers superior thermal coupling and smaller footprint but requires CSBGA reflow expertise; versus MAX5477ETA+, it delivers autonomous temperature compensation without firmware overhead or external sensor routing.

Availability

DS1847B-010+T&R is available at Aetrix Electronics and suitable for laser diode bias control, industrial sensor signal conditioning, optical transceiver tuning, and automotive cabin temperature compensation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for DS1847B-010+T&R 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, mixed-signal, and digital ICs for industrial, communications, computing, and consumer applications.

The DS1847B-010+T&R belongs to Maxim's temperature-aware programmable resistor product line, engineered specifically for closed-loop analog calibration in space-constrained, thermally dynamic systems.

FAQ

What is the function of the WP pin on the DS1847B-010+T&R?

The WP (Write Protect) pin on the DS1847B-010+T&R is an active-low input that disables writes to EEPROM, configuration registers, and look-up tables when held high (logic 1). Internally pulled up, it must be driven low to enable programming. Critically, WP does not inhibit automatic temperature/resistor updates - the device continues compensating bias points even when write-protected. This ensures safe field deployment after factory calibration.

Does the DS1847B-010+T&R support both 3.3V and 5V I²C buses?

Yes, the DS1847B-010+T&R supports 3.3V and 5V supply operation (3.0V–5.5V), and its open-drain SDA/SCL pins are compatible with standard I²C voltage levels. Input logic thresholds scale with VCC (VIH ≥ 0.7VCC, VIL ≤ 0.3VCC), so it interoperates reliably with 3.3V microcontrollers and 5V legacy controllers without level shifters - provided pull-up resistors match the bus voltage.

How is temperature resolution achieved in the DS1847B-010+T&R?

The DS1847B-010+T&R achieves 2°C temperature resolution via its address-mapped look-up table: memory location 00h corresponds to -40°C, 01h to -38°C, and so on up to 47h at +95°C. The internal temperature sensor outputs a 13-bit value updated every 10ms, and the device uses this reading to index into the LUT - selecting the nearest 2°C bin. Hysteresis prevents oscillation at transition boundaries.

Can both resistors in the DS1847B-010+T&R be programmed independently?

Yes, the DS1847B-010+T&R contains two physically separate 10kΩ resistors (R0 and R1), each controlled by its own 72×8-bit EEPROM look-up table (LUT1 and LUT2). The Table Select Byte (E0h) allows independent read/write access to either LUT. This enables asymmetric compensation - for example, setting R0 for laser bias and R1 for thermistor reference scaling - without cross-interference.

What is the maximum operating temperature for programming the DS1847B-010+T&R?

The DS1847B-010+T&R specifies a programming temperature range of 0°C to +70°C, distinct from its wider operating range (-40°C to +95°C). EEPROM writes and LUT modifications must occur within this window to ensure data integrity and endurance. Attempting writes outside 0°C–70°C may result in incomplete programming or reduced write-cycle lifetime; factory calibration is performed within this spec.