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AS7331 数据表(PDF) 29 Page - OSRAM GmbH

部件名 AS7331
功能描述  Spectral UVA/B/C Sensor
PDF  72 Pages
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制造商  OSRAM [OSRAM GmbH]
网页  http://www.osram.com
标志 OSRAM - OSRAM GmbH

AS7331 数据表(HTML) 29 Page - OSRAM GmbH

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AS7331
Functional Description
Datasheet
• PUBLIC
DS001047
• v4-00 • 2023-Mar-24
71
│ 28
It is also possible to use the power down state in combination with SYNS mode. The falling edge at
pin SYN immediately starts the conversion after power down ends shown by the signal at pin READY.
That kind of measurement is only useful in case the distance between falling edges at pin SYN is
more than the conversion time, pause time, and startup time altogether. Figure 23 shows the principle
sequence of measurement in SYNS mode being ready
(bits OSR:PD = “1” and OSR:SS = “1”) and
waiting for the falling edge at pin SYN to startup.
Figure 23:
Principle Sequence of Measurement in SYNS Mode
By additionally activating s
tandby (bit CREG3:SB = “1”), a maximum amount of energy can be saved,
because the operational readiness is not given until shortly before A/D conversion starts. When
starting reading process of the results (pause time), the device is also saving energy in the standby
state (see Figure 24). Figure 24 shows the principle sequence of measurement in SYNS mode being
ready with OSR:PD = “1” (as in Figure 23), but with bit CREG3:SB = “1” to save a maximum amount of
energy as explained above.
Figure 24:
Principle Sequence of Measurement in SYNS
Mode Being Ready with OSR:PD = “1”
MEASUREMENT
PAUSE
POWDOWN
POWDOWN
MEASUREMENT 1
STATE
MRES1 …
MRES3
READY
I²C activity
data
fetch
RESULTS 1
OSR
C0h
SYN
TCONV
start
start
TBREAK
TSTARTPD
TSTARTPD
SBY
S
MEASUREMENT 1
S
POWDOWN
STATE
MRES1 …
MRES3
READY
I²C activity
OSR
C0h
SYN
start
MEASUREMENT
PAUSE
POWDOWN
data
fetch
RESULTS 1
start
TBREAK
TCONV
TSTARTPD
TSTARTSB
TSTARTPD
TSTARTSB
STANDBY
STANDBY



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