PS081 datasheet(42/155 Pages) AMSCO

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3-19

PSØ81

tdc_conv_cnt

cyctime

The cyctime-parameter defines the time waited for the next discharging. By the parameter stretch,

the time between 2 discharging cycles can be defined. The parameter sel_start_osz defines what

time the oscillator is started before the discharging cycles are coming.

Fig. 3.22: Stretched in Single Conversion

Basically in Single Conversion Stretched mode the parameters remain the same. But tdc_conv_cnt

defines additionally the time between measurement sequences.

3.5.4

Mode Selection Criteria

Table 3.1 Mode Selection criteria

Applications

Mode

Parameters

Description

Highest resolution with no

current limitation

Standard mode for all ap-

plications with > 500 µA

current capability

Continuous

mode

single_conversion = 0

stretch = 0

Continuously measuring,

4 MHz oscillator on all the

time

High resolution but lower

current

Stretched

continuous

mode

single_conversion = 0

stretch = 2 or 3

cycle time =

cytime*100µs

Continuously measuring. 4

MHz oscillator on only during

the discharge time measure-

ment.

Lowest current consumption

Mechanically stable applica-

tions like pressure sensors

Single

conversion

mode

single_conversion = 1

stretch = 0

option with lowest current

consumption, undersampling

-> no suppression of me-

chanical vibrations

High resolution but low cur-

rent,

e.g. battery driven legal-

for-trade scales with 3000

divisions

Stretched

mode

single_conversion = 0

stretch = 2

cycle time =

cytime*100µs

option with low current con-

sumption and oversampling

for suppression of mechani-

cal vibrations.

High resolution but lowest

current,

e.g. solar scales

Stretched

single

conversion

mode

single_conversion = 1

stretch = 2 or 3

cycle time =

cytime*100µs

option with very low current

consumption and overs-

ampling for suppression of

mechanical vibrations.

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