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AS73211

Functional Description

Datasheet

• PUBLIC

DS000556

• v3-01 • 2018-Feb-07

│ 27

The following example of a SYNS mode shows a correct measurement procedure but with an

unfavorable chosen application. After start of measurement with bit OSR:SS = ‚1‘ only the red marked

falling edges (see Figure 27) at pin SYN are accepted as start condition, because of the too tight

distances of the SYN edges a lot of falling edges are ignored during startup phase (TSTARTPD),

conversion time (TCONV) and pause time (TBREAK).

Figure 27:

Principle Sequence of Measurement in SYNS M

ode (OSR:PD , OSR:SS are set to ‚1‘)

Continuously occurring SYN pulses (e.g. generated by a PWM controlling in measurement mode

SYND) are ignored in Configuration state and while pause time TBREAK (see Figure 28) is activated.

It is recommended to increase the default value of register BREAK accordingly, if the time reference

result OUTCONV must be read via I²C interface. The conversion time is given by register EDGES, but

as shown in Figure 28 the real conversion time is always represented by TCONV at pin READY.

Furthermore, the output result OUTCONV can be used to get the right measurement result (see also

chapters

“Transfer Function” and “Conversion Time Measurement in SYND Mode”). Figure 28 shows

the principle sequence of measurement in SYND mode ready for wake-up after switch off Power

own state with OSR:PD = ‚0‘ and setting of OSR:SS to ‚1‘ in Configuration state, then waiting for start

via pin SYN (with exemplary settings

of EDGES = 06h and CREG3:SB = ‚1‘ for energy saving while

pause time TBREAK).

READY

SYN

MRES1 …

MRES3

start

RESULTS 1

POWDOWN

STATE

MEAS

PAUSE

POWDOWN

MEASUREMENT 1

TBREAK

I²C activity

OSR

C0h

data

fetch

TCONV

TSTARTPD

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