TIPD188

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

Design files

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.

Industrial

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Design files & products

Design files

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

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Design guide — TIPD188

TIDUAC1A.PDF (1693 KB)

Reference design overview and verified performance test data

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Bill of materials (BOM) — TIPD188

TIDRG60.PDF (194 KB)

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

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Schematic — TIPD188

TIDCAM8.ZIP (2374 KB)

Detailed schematic diagram for design layout and components

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Schematic — TIPD188

TIDRG59.PDF (177 KB)

Detailed schematic diagram for design layout and components

Products

Includes TI products in the design and potential alternatives.

Low-power MCUs

MSP430F5529 — 25 MHz MCU with 128KB Flash, 8KB SRAM, 12-bit ADC, comparator, DMA, UART/SPI/I2C, USB, HW multiplier

Data sheet: PDF | HTML

Precision ADCs

ADS1263 — 32-bit 38-kSPS 10-ch delta-sigma ADC with PGA, VREF and auxiliary ADC for factory automation

Data sheet: PDF | HTML

Precision ADCs

ADS1262 — 32-bit 38-kSPS 10-ch delta-sigma ADC with PGA and voltage reference for factory automation

Data sheet: PDF | HTML

Analog & precision switches & muxes

TS5A21366 — 5V, 1:1 (SPST), 2-channel, analog switch, 0.75Ω Ron, 1.8V compatible logic

Data sheet: PDF | HTML

Start development

Hardware development

Development kit

MSP-EXP430F5529LP — MSP430F5529 LaunchPad™ development kit for USB

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.

Supported products & hardware

Hardware development

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

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MSP-EXP430F5529LP — MSP430F5529 LaunchPad™ development kit for USB

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