TIPD188
High-Resolution, Low-Drift, Precision Weigh-Scale Reference Design with AC Bridge Excitation
TIPD188
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)
ADS1262 — 32-bit 38-kSPS 10-ch delta-sigma ADC with PGA and voltage reference for factory automation
Data sheetPrecision ADCs (<=10MSPS)
ADS1263 — 32-bit 38-kSPS 10-ch delta-sigma ADC with PGA, VREF and auxiliary ADC for factory automation
Data sheetAnalog switches & muxes
TS5A21366 — 0.75-Ω on-state resistance, 5-V, 1:1 (SPDT), 2-channel analog switch with 1.8-V input logic
Data sheetMSP430 microcontrollers
MSP430F5529 — 25 MHz MCU with 128KB Flash, 8KB SRAM, 12-bit ADC, comparator, DMA, UART/SPI/I2C, USB, HW multiplier
Data sheetStart development
Technical documentation
= Top documentation selected by TI
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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
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