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AS73211

Functional Description

Datasheet

• PUBLIC

DS000556

• v3-01 • 2018-Feb-07

│ 20

Figure 18:

Principle Sequence for a Measurement Start in SYNS Mode,

OSR:DOS = 011b and OSR:SS = ‚1‘

7.8

Synchronous Measurement Start and End Mode

– SYND

In this mode, the signal at pin SYN controls the start and stop of a measurement completely. When

the device is waiting in Measurement state and OSR:SS is set to ‚1‘ the first falling edge at pin SYN

starts the measurement. Each following falling edge of signal SYN, which occurs within the conversion

time, can continue or stop the measurement. The content of the register EDGES determines, which

edge is the stopping one. That means the measurement will not stop until a certain number of falling

edges at pin SYN passed within the conversion time. The value of register EDGES determines the

number of edges (see Figure 19

and chapter “Register - EDGES”). Figure 19 shows the principle

sequence for a measurement start in SYND mode. While waiting in Measurement state is shown as

IDLE, after OSR:SS is set to ‚1‘ (see Figure 45) the AS73211 waits for signal SYN to start. The

conversion time is set to 06h in register EDGES, during the pause time TBREAK falling edges at pin

SYN are ignored.

IDLE

STATE

MRES1 …

MRES3

READY

I²C activity

SYN

IDLE

start

MEASURMENT 2

PAUSE

MEASUREMENT 1

data

fetch

RESULTS 1

TCONV

start

TBREAK

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