PS081 datasheet(39/155 Pages) AMSCO

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PSØ81

on only for the sequence. This mode offers the lowest current consumption and is best choice for

body scales.

Pure Single Conversion Mode should be used only in mechanically stable systems like body scales,

because it implies undersampling. The consequence of undersampling is that mechanical oscillations

of the weighing system will end up in unstable data.

3.5.3

Stretched Mode

Streched Mode combines the advantage of a few measurements (to save current) and a reasonable

distribution of these measurements for avoiding undersampling. Hence, the discharge cycles are

stretched in a way that the total number is not increased but the distribution is improved.

3.5.3.1

Stretched Continuous Mode

Figure 3.18 Stretched continuous mode

Stretched Conitnuous Mode combines stretched mode and continuous mode. There are longer inter-

vals between the discharge time measurements for the half bridges. The oscillator is activated only

for each half bridge measurement.

This mode is used in applications that target high resolution at low current (< 500 µA). It also has

a good frequency response (e.g. load cell vibrations) on the input signal. The response can easily be

calculated by the Nyquist theorem. This mode together with a good software anti-vibration filter gives

best vibration suppression at lowest current. This mode is recommended e.g. for battery driven solar

kitchen scales.

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