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AS7331

Functional Description

Datasheet

• PUBLIC

DS001047

• v4-00 • 2023-Mar-24

│ 23

Figure 17:

Principle Sequence for a Measurement Start in SYND Mode

The conversion time (TCONV) is determined by the duration between the edges of the start and stop of

the SYN signal. If CREG2:EN_

TM is set to “1”, the register OUTCONV contains an equivalent amount

of TCONV as counts of the internal clock. With the value of OUTCONV, the measurement results can be

calculated more precisely (see chapter 7.6).

7.3

Energy Saving Options

The usage of the energy-saving options is consistent for all measurement modes. The signal path at

pin READY always represents, independent of wake-up times or synchronizing events at pin SYN

concerning the internal clock, the real measurement process. Every measurement mode can be

terminated with OSR:SS =

“0” or changing to the configuration state at every time, whereas

uncompleted A/D conversions are not stored. In the case of both energy-saving options power down

state (POWDOWN) and standby state (STANDBY) are switched on (OSR:PD =

“1” and

CREG3:SB =

“1”). The startup times (TSTARTPD and TSTARTSB) run one after the other after power down

and standby are switched off.

7.3.1

Power Down

Power down is an option to reduce power consumption. After applying the power supply voltage

including power-on reset or after software reset, the AS7331 stays in power down state. The clock

generator and all analog parts of the device are turned off. The power consumption of the device is

close to zero. The digital part of the AS7331 stays idle, but full communication via the I²C interface is

granted in the configuration and measurement state.

STATE

READY

I²C activity

OSR

80h

start 1.

start

SYN

IDLE

PAUSE

MEASUREMENT 2

TCONV

MEASUREMENT 1

TBREAK

RESULTS 1

data

fetch

RESULT 1

MRES1 …

MRES3

IDLE

OUTCONV

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