TIPD188

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

TIPD188

Design files

Overview

This precision weigh-scale reference design achieves greater than 50,000 noise-free counts of resolution. Offset and offset drift errors are nearly eliminated by ac bridge excitation. This design takes advantage of the high-resolution ADS1262 delta-sigma ADC.

Features
  • >50,000 noise-free count weigh-scale solution
  • Operating temperature range: -40 ᵒC to +125 ᵒC
  • Less than 1 μV total error across temperature range
  • ADC Supply and Bridge Excitation Voltage: 5V
  • Bridge Output: 0 V to 10 mV
  • Firmware provides ADS1262 example code
  • This robust circuit reference design includes theory, complete error analysis, component selection, simulation, PCB design, example code, and measured data that correlates with the theory and simulation.

Design files & products

Design files

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

TIDUAC1A.PDF (1692 K)

Reference design overview and verified performance test data

TIDRG59.PDF (176 K)

Detailed schematic diagram for design layout and components

TIDCAM8.ZIP (2373 K)

Detailed schematic diagram for design layout and components

TIDRG60.PDF (193 K)

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

Products

Includes TI products in the design and potential alternatives.

Precision ADCs (<=10MSPS)

ADS126232-bit 38-kSPS 10-ch delta-sigma ADC with PGA and voltage reference for factory automation

Data sheet document-pdfAcrobat PDF open-in-new HTML
Precision ADCs (<=10MSPS)

ADS126332-bit 38-kSPS 10-ch delta-sigma ADC with PGA, VREF and auxiliary ADC for factory automation

Data sheet document-pdfAcrobat PDF open-in-new HTML
Analog switches & muxes

TS5A213660.75-Ω on-state resistance, 5-V, 1:1 (SPDT), 2-channel analog switch with 1.8-V input logic

Data sheet document-pdfAcrobat PDF open-in-new HTML
MSP430 microcontrollers

MSP430F552925 MHz MCU with 128KB Flash, 8KB SRAM, 12-bit ADC, comparator, DMA, UART/SPI/I2C, USB, HW multiplier

Data sheet document-pdfAcrobat PDF open-in-new HTML

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Software

Firmware

TIPD188 Firmware (Rev. A) – TIDCAN1A.ZIP (12418 K)

Technical documentation

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Type Title Date
* Design guide High-Resolution, Low-Drift, Precision Weigh-Scale Reference Design (Rev. A) Feb. 15, 2019
More literature TIPD188 Firmware (Rev. A) Aug. 15, 2018
Technical article The real secret to become a better cook. Integrate smart scale technology in kitchen appliances. Oct. 25, 2016
Technical article It's in the math: how to convert an ADC code to a voltage (part 2) Apr. 29, 2016

Related design resources

Hardware development

DEVELOPMENT KIT
MSP-EXP430F5529LP MSP430F5529 USB LaunchPad development kit

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