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AS7331

Functional Description

Datasheet

• PUBLIC

DS001047

• v4-00 • 2023-Mar-24

│ 26

the measurement, the A/D conversion follows immediately after the wake-up time (TSTARTSB) of about

4 µs.

Figure 20 shows the principle start and stop sequence of measurement after startup with

OSR:PD =

“0” and CREG3:SB = “1”:

CREG3 programming: B

it CREG3:SB = “1”,

OSR programming: 02h, after startup continuing with configuration mode,

OSR programming: 83h, measurement start, wake-up and conversion, return to standby

after measurement ends.

Figure 20:

Principle Start and Stop Sequence of a Measurement After Startup with OSR:PD =

“0” and

CREG3:SB = “1”

7.3.3

Examples

For both modes, CONT and SYN, it is recommended to configure a pause time, TBREAK, (register

BREAK Figure 51), to avoid disturbances during the A/D conversion caused by the I²C interface

communication. The selectable pause time using the register BREAK should be long enough, such

that all the output results are read before the next conversion starts (automatically in CONT modus or

synchronized via pin SYN in SYN modes). While the pause time (TBREAK) is running, it is possible to

save energy if the bit CREG3:SB is configured to

“1”. The wake-up time, TSTARTSB, of about 4 µs is

short, compared to the necessary time for the I²C communication protocol represented by the BREAK

Figure 21 shows the principle sequence of CONT mode;

if CREG3:SB is set to “1”, saving energy is

possible while the pause time TBREAK is activated for I²C interface communication.

STANDBY

CONFIGURATION

POWDOWN

MEASUREMENT

STANDBY

STATE

I²C activity

OSR

83h

OSR:PD ← ‚0'

CREG3:SB ← ‚1'

TSTARTPD

TSTARTSB

AS7331 数据表(PDF) 27 Page - OSRAM GmbH

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