Analog Devices Inc./Maxim Integrated MAX1454AUE+T

Overview

MAX1454AUE+T from Maxim Integrated is a precision analog sensor signal conditioner IC for automotive pressure and strain gauge systems. It delivers 16-bit offset/FSO calibration, 32-step PGA gain (6–2048 V/V), on-chip temperature sensing (8-bit ADC), 2K × 8-bit flash memory, and ±45V overvoltage/reverse-voltage protection. It enables true sensor interchangeability in pressure calibrators and resistive element sensors.

For engineers reviewing the MAX1454AUE+T datasheet, MAX1454AUE+T pinout, MAX1454AUE+T application, or MAX1454AUE+T equivalent, key selection criteria include its fully analog signal path (no quantization noise), single-pin DIO programming interface, 85µs step response, -40°C to +125°C AEC-Q100 Grade 1 operation, and support for both voltage- and current-mode bridge excitation.

Technical Context

The MAX1454AUE+T implements a mixed-signal architecture where sensor signals pass through a switched-capacitor PGA with input-referred offset trimming (±150 mV), then undergo digitally controlled analog compensation via four 16-bit DACs (offset, FSO, offset TC, FSO TC). Its internal 8-bit temperature ADC indexes 176-point lookup tables stored in flash memory at ~1.5°C resolution for real-time offset and FSO correction.

Calibration coefficients are loaded from 2K × 8-bit flash memory during power-up or updated dynamically via the multiplexed OUT/DIO pin using an asynchronous serial protocol (4800–38,400 bps). Fault detection monitors IN+/IN- against 20%/80% of VBDR and clips OUT/DIO to ~200 mV under fault conditions - all configurable via CONFIG2 register bit 6.

Key Specifications

Pinout & Package

MAX1454AUE+T is housed in a 16-pin TSSOP package (4.4mm × 5mm, 0.65mm pitch) with exposed pad for thermal dissipation. Pin 1 is located at top-left corner when notch faces up; pin numbering follows standard counter-clockwise convention.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar sensor signal conditioning applications.

Compared with MAX1452AUE+, MAX1454AUE+ adds dual-temperature compensation DACs and extended LUT depth for superior accuracy in mismatched thermal environments; compared with AD8555ARUZ, it integrates flash, DACs, and temperature sensing to eliminate 7+ external components and reduce calibration time by >90%.

Availability

MAX1454AUE+T is available at Aetrix Electronics and suitable for automotive pressure sensing, industrial strain gauge instrumentation, and portable calibration equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX1454AUE+T 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 high-performance analog and mixed-signal ICs for automotive, industrial, and communications markets - with emphasis on reliability, integration, and AEC-Q100 qualification.

The MAX1454 product line targets precision sensor signal conditioning in harsh environments - specifically engineered to replace multi-component discrete solutions with a single IC that delivers calibrated, temperature-compensated analog output.

FAQ

What is the maximum bridge drive current supported by the MAX1454AUE+T?

The MAX1454AUE+T supports a programmable bridge drive current from 0.1 mA to 2.5 mA. This is achieved using an internal current source with four selectable mirror ratios (CMRATIO[1:0] = 00 to 11), allowing optimization for sensor impedances ranging from 2 kΩ to 10 kΩ. The actual current depends on the selected ratio and the reference resistor (10 kΩ ±600 ppm/°C).

Does the MAX1454AUE+T require external components for basic operation?

No, the MAX1454AUE+T requires only three external passive components for full operation: a 0.1 µF capacitor from VDD to GND, a 0.1 µF capacitor from VDDX to GND, and a weak pull-up resistor (~10 kΩ) on the OUT/DIO pin for digital programming. All calibration DACs, PGA, flash memory, LDO, and temperature sensor are fully integrated - no external trim pots, references, or op-amps are needed.

How does the MAX1454AUE+T handle sensor faults during operation?

The MAX1454AUE+T continuously monitors IN+ and IN- voltages against 20% and 80% of VBDR. When either input exceeds these thresholds, an internal fault flag is asserted and the OUT/DIO pin is actively clamped to ~200 mV (typical). This behavior is enabled/disabled via CONFIG2 register bit 6 (ENFDET) and provides deterministic fail-safe output for downstream controllers without requiring additional supervision circuitry.

Can the MAX1454AUE+T perform temperature compensation when the sensor and IC are at different temperatures?

Yes - the MAX1454AUE+T supports 1st-order temperature compensation under sensor-IC thermal gradient conditions using its dedicated offset TC and FSO TC DACs. These DACs reference the bridge voltage (VBDR), causing their outputs to scale with sensor temperature via its TCR. Only two calibration temperatures are required to program linear compensation - eliminating need for co-located thermal mounting.

What flash memory endurance and retention specifications apply to the MAX1454AUE+T?

The MAX1454AUE+T features 2K × 8-bit internal flash memory rated for 10,000 program/erase cycles and 10-year data retention at +85°C. Page erase (512-byte blocks) and mass erase operations each require 32 ms; no commands are accepted during erase. Factory-programmed values at addresses 0x400 and 0x401 must not be altered, as doing so may corrupt factory trim settings essential for baseline accuracy.