PS081 datasheet(41/155 Pages) AMSCO

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3-18

PSØ81

cyctime

oscillator

sel_start_osz

stretch

single_conversion / continuous

Configuration:

single_conversion = 0

Selects continuous mode. In this mode the PSØ81 is continuously

measuring. The 4 MHz oscillator is on continuously. This takes about

130 µA @ 3.0 V.

single_conversion = 1

Selects single conversion mode. In this mode the PSØ81 makes one

complete measurement and then switches off the 4 MHz oscillator for

the duration of the single conversion counter.

stretch

Configuration:

stretch = 0

off

stretch = 1

The 4 MHz oscillator is on only for the duration of a single discharge time measure

ment. The cycle time (time between subsequent discharge time measurements) is

calculated on the basis of the 10 kHz oscillator.

- not recommended -

stretch = 2 or 3

The 4 MHz oscillator is on only for the duration of a single half bridge measure-

ment (two discharge time measurements). The cycle time (time between subse-

quent half bridge time measurements) is calculated on the basis of the 10 kHz

oscillator. The time interval between the two discharge time measurement for a

halfbridge is 200 µs in case stretch = 2 or 300 µs in case stretch = 3

Stretched Mode Settings

In stretched mode there are several parameters which configure the mode, these are:

stretch[13:12] in Configreg_03

cytime[13:4] in Configreg_02

sel_start_osz[19:17] in Configreg_03

single_conversion [2] in Configreg_02

tdc_conv_cnt[23:16] in Configreg_00

Those parameters set the stretch mode. The

following 2 pictures show how the parameters are

applied, one showing the continious stretched the

other the single conversion stretched mode.

Fig. 3.21: Parameters in continious stretched mode

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