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Picostrain Applications

Lithium coin cell driven scale with 2,000 divisions

 

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 consumption: minimized

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

 

Coin Cell Driven Scale

(Click to enlarge)

 

Adding a low-power microcontroller it will be possible to build up a scale with a total power consumption of + 100 µA.

 

A CR2032 offers 160 mAh and would allow 1,600 operating hours.

 

At estimated 5 measurements per day, lasting for 3 minutes each, the battery would run for 17.5 years!