AS7331 datasheet(28/72 Pages) OSRAM

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AS7331

Functional Description

Datasheet

• PUBLIC

DS001047

• v4-00 • 2023-Mar-24

│ 27

Figure 21:

Principle Sequence of CONT Mode

– if CREG3:SB is Set to “1”

Another example shows, that after the end of a conversion in CMD mode the AS7331 returns to power

down and/or standby state depending on the bits OSR:PD and CREG

3:SB. In case of both bits are “0”

while the measurement state the device would return to idle, waiting for the next measurement to start.

Figure 22 shows the principle sequence whereas measurement starts in CMD mode with power down

and standby switched on (device is already in measurement state):

CREG3 programming: B

it CREG3:SB = “1” was set in Configuration state (not shown),

OSR programming: C0h, “startup” and “wake-up” before conversion starts,

“Automatically” OSR programming: 43h, the end of conversion resets bit OSR:SS, to

power down.

Figure 22:

Principle Sequence Whereas Measurement is Started in CMD Mode with Power Down, Standby

Switched On

STANDBY

MRES1 …

MRES3

READY

STATE

I²C activity

MEASUREMENT 1

data

fetch

RESULTS 1

RESULTS 2

data

fetch

TBREAK

MEASUREMENT 2

MEASUREMENT 3

TCONV

OSR

83h

TSTARTSB

STANDBY

PAUSE

STANDBY

PAUSE

RESULTS

POWDOWN

MEASUREMENT

TCONV

MRES1 …

MRES3

READY

STATE

I²C activity

start (OSR:SS ← ’1')

TSTARTPD

TSTARTSB

data

fetch

clear (OSR:SS ← ’0')

STANDBY

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