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AS7331

Functional Description

Datasheet

• PUBLIC

DS001047

• v4-00 • 2023-Mar-24

│ 25

Coming from power down

state activated by OSR:PD = “1”, the AS7331 is not actively switched

on until OSR:SS is set to

“1” (together while or with OSR:DOS = 011b). This means the bit

OSR:SS is a direct start condition for the CMD and CONT modes, whereas for both SYN

modes, the falling edge at pin SYN is necessary for the startup. The programmed measurement

mode follows after startup, marked by the falling edge of the signal path at the READY pin. If

the configuration contains CREG3:SB =

“1” (as the example in Figure 19 shows), additionally

after startup time (TSTARTPD), the wake-up time (TSTARTSB) of 4 µs follows, before the

measurement starts.

Figure 19:

Principle Start of

the Measurement from OSR:PD = “1” and CREG3:SB = “1”

Figure 19 shows the principle start of

the measurement from OSR:PD = “1” and CREG3:SB = “1”:

CREG3 programming: bit CREG3:SB =

“1”,

OSR programming: C3h, start of the measurement with prior run of TSTARTPD and TSTARTSB.

The programmed energy-saving option (before or when the measurement is started or during the

measurement) is switched on after the regular end of the measurement and storing of the results

within the buffer registers. In case of an abortion of

the measurement with OSR:SS = “0” or switching

to the configuration state the energy saving option is switched on without saving any results.

7.3.2

Standby

Standby is another option for reducing the power consumption, but compared to power down, fewer

internal analog components are switched off to be able to become active again in a very short time.

The digital part of the AS7331 stays idle, but full communication via the I²C interface is granted in

configuration and measurement states. The CREG3:SB bit can only be changed in the configuration

mode. The wake-up process is possible in combination with the start condition of the configured

measurement mode. Standby is automatically deactivated by starting the CMD or CONT

measurement mod

e by setting the bit OSR:SS to “1”. In addition, for the measurement modes SYNS

and SYND, an initiated start is necessary by the falling edge of the signal at pin SYN. While starting

TSTARTSB

MEASUREMENT

CONFIGURATION

POWDOWN

STATE

I²C activity

OSR

C3h

CREG3:SB ← ‚1'

TSTARTPD

STANDBY

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