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AS7331

Functional Description

Datasheet

• PUBLIC

DS001047

• v4-00 • 2023-Mar-24

│ 22

Figure 16:

Principle Sequence for a Measurement Start in SYNS Mode, OSR:DOS = 011b and

OSR:SS = “1”

7.2.4

Synchronous Measurement Start and End Mode

– SYND

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

device is waiting in the 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 pass within the conversion time. The value of register EDGES determines the

number of edges (see Figure 17 and chapter 8.2.7). Figure 17 shows the principle sequence for a

measurement to start in SYND mode. While waiting in the Measurement state is shown as IDLE, after

OSR:SS is set to “1” (see Figure 45) the AS7331 waits for signal SYN to start. The conversion time is

set to 06h in register EDGES, during the pause time (TBREAK), and 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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