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Transducers Direct Main WebsiteproductsTDCsTDC-GP1TDC-GP2TDC-F1TDC-GPXATMDcustomMethodApplicationsPICOSTRAINPS02PSA2MethodAdvantagesPerformanceApplicationsPICOTURNPICOTURN-BMMethodLegal

Task:

Sensor:Halfbridge, 1000 Ohm SG
Sensitivity:1 mV/V (500 µ, K = 2)
Update rate:4 Hz
Resolution:2,000 scale divisions
(4 sigma/div => 312 nV rms noise)
Current consumptionminimized
Supply voltage:3 V Lithium coin cell
Application:Pocket scale
Settings:

Measurement range 2, Burst mode, Cycle time 100 µs, AVRate 5, Rdson compensation.

Current consumption:

Current into strain gage and PS02 I/O section:
19.2 µA
Current into PS02 core:
5.7 µA
Oscillators:
6.4 µA
Comparator:
50.0 µA
Totel current:
81.3 µA

Adding a low-power microcontroller it will be possible to build up a scale with a total power consumptio of + 100 µA. A CR2032 offers 160 mAh and would allow 1,600 operating hours. Estimated 5 measurements per day, lasting for 3 minutes each, the battery would run for 17.5 years.