Figure 1 is a generic block diagram for a weighing scale. It is not the representation of what Cypress has. Yes, PSoC3 and PSoC5 devices have 20 bit DelSig ADC with which we can achieve 18 up to ENOB. Can you please guide us where did you find this value of precision?
A good overview of design considerations for a weigh scale. Notice though that Figure 1 is showing a 24-bit ADC whereas the DelSig peripheral is up to 20-bits. Also, the article states that "such ADCs (with internal gain amps) can provide about 18 effective numbers of bits" though generally commercial applications would require 16. The Cypress website states the DelSig peripheral gives a precision of up to 0.003% which if I figured right is 15-bits.
What are the engineering and design challenges in creating successful IoT devices? These devices are usually small, resource-constrained electronics designed to sense, collect, send, and/or interpret data. Some of the devices need to be smart enough to act upon data in real time, 24/7. Are the design challenges the same as with embedded systems, but with a little developer- and IT-skills added in? What do engineers need to know? Rick Merritt talks with two experts about the tools and best options for designing IoT devices in 2016. Specifically the guests will discuss sensors, security, and lessons from IoT deployments.