TIDA-00765

1g Resolution over 15kg Range Sub-100nVpp Noise Front-End Reference Design

TIDA-00765

Design files

Overview

TIDA-00765 is a less than 100nVpp analog front end for resistive strain gauge bridge load cell-based weight and vibration measurement. It is ideally suited for appliances, which require high-resolution due to large dynamic range or have considerable weight offset. In the face of significant levels of switching supply noise and rapid temperature changes, drift and interference are common issues in harsh environments. The design’s high integration, AC excitation, and robust filtering suppress drift and interference to ensure consistent performance in tough environments.

Features
  • Captures outputs of both multiple and single resistive strain gauge-based load cell bridges simultaneously
  • Consistent <100nVpp low-noise performance
  • <5-μV total error from 0ᵒC to 85ᵒC
  • AC excitation robustly eliminates drift introduced by parasitic thermocouples and other causes
  • Highly robust to >500mVpp 100-kHz switching-supply noise
  • Captures vibrations up to 500 Hz with sample rate ≤2 kSps

A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDUBL0A.PDF (2475 K)

Reference design overview and verified performance test data

TIDRL52.PDF (690 K)

Detailed schematic diagram for design layout and components

TIDRL53.PDF (63 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDRL54.PDF (250 K)

Detailed overview of design layout for component placement

TIDRL56.ZIP (3319 K)

Files used for 3D models or 2D drawings of IC components

TIDCC12.ZIP (434 K)

Design file that contains information on physical board layer of design PCB

TIDRL55.PDF (1764 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Precision ADCs (<=10MSPS)

ADS122024-bit, 2-kSPS, four-channel, low-power, delta-sigma ADC with PGA, VREF, SPI and two IDACs

Data sheet: PDF | HTML
Analog switches & muxes

TS5A213660.75-Ω on-state resistance, 5-V, 1:1 (SPST), two-channel analog switch with 1.8-V input logic

Data sheet: PDF | HTML
Digital temperature sensors

LMT010.5°C Accurate 2-pin Temperature Sensor with a Pulse Train Interface

Data sheet: PDF | HTML
ESD & surge protection ICs

TPD4E1U06Quad 0.8-pF, 5.5-V, ±15-kV ESD protection diode in SOT-23 & SC70 packages

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

LP5907250-mA, low-noise, high-PSRR, ultra-low-dropout voltage regulator with low IQ and enable

Data sheet: PDF | HTML
MSP430 microcontrollers

MSP430G255316 MHz MCU with 16KB Flash, 512B SRAM, comparator, UART/SPI/I2C, timer

Data sheet: PDF
N-channel MOSFETs

CSD13381F412-V, N channel NexFET™ power MOSFET, single LGA 1 mm x 0.6mm, 180 mOhm, gate ESD protection

Data sheet: PDF | HTML
P-channel MOSFETs

CSD23381F4-12-V, P channel NexFET™ power MOSFET, single LGA 0.6 mm x 1 mm, 175 mOhm, gate ESD protection

Data sheet: PDF | HTML

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Software

Firmware

TIDA-00765 Firmware — TIDCC13.ZIP (4256 K)

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Technical documentation

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Type Title Date
* Design guide High-Resolution Low-Noise Front-End Weight Vibration Measurement Design Guide (Rev. A) Jun. 14, 2016
Technical article The real secret to become a better cook. Integrate smart scale technology in kitchen appliances. Oct. 25, 2016
More literature TIDA-00765 Firmware Apr. 01, 2016

Related design resources

Hardware development

EVALUATION BOARD
ADS1220EVM ADS1220 evaluation module MSP-EXP430G2 MSP430G2 LaunchPad™ development kit

Reference designs

REFERENCE DESIGN
TIPD188 High-Resolution, Low-Drift, Precision Weigh-Scale Reference Design with AC Bridge Excitation

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