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AS7331 数据表(PDF) 22 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) 22 Page - OSRAM GmbH

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AS7331
Functional Description
Datasheet
• PUBLIC
DS001047
• v4-00 • 2023-Mar-24
71
│ 21
Figure 15:
Principle Sequence for a Measurement Start in CMD Mode Coming From Configuration State
7.2.3
Synchronous Measurement Mode
– SYNS
In this measurement mode, the input pin, SYN, acts as a trigger event for the start of A/D conversion.
The falling edge at the SYN pin starts the measurement. The conversion time (TCONV) is determined by
the content of the register CREG1:TIME (see Figure 48). The READY pin signalizes the progress of
conversion (see Figure 16), its rising edge shows the end of conversion and its available valid results.
The data fetch should be performed between the rising edge of signal READY and the next falling
edge of signal SYN, in order to allow distortion-free measurements. SYN pulses during the
programmed pause time TBREAK are ignored to avoid a start of the measurement during a running data
fetch. The bit OSR:SS also takes effect in the SYNS mode, because the start of the measurement is
only possible with OSR
:SS = “1”.
Figure 16 shows the principle sequence for a measurement to start in SYNS mode, OSR:DOS = 011b
and OS
R:SS = “1” already set and waiting in Measurement state is shown as IDLE.
IDLE
MEASUREMENT 2
RESULTS 1
MEASUREMENT 1
CONFIGURATION
IDLE
TCONV
MRES1
MRES3
READY
STATE
I²C activity
RESULTS 2
TCONV
data
fetch
LDATA = "0"
NDATA = "0"
LDATA = "0"
NDATA = "1"
LDATA = "1"
NDATA = "1"
LDATA = "0"
NDATA = "0"
OSR = 83h
start (OSR:SS
"1")
start (OSR:SS
"1")



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