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AS73211

Functional Description

Datasheet

• PUBLIC

DS000556

• v3-01 • 2018-Feb-07

│ 24

measurement mode 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 the

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

4µs.

Figure 22 shows the principle start and stop sequence of a measurement after startup with OSR:PD =

‚0‘ and CREG3:SB = ‚1:

CREG3 programming: bit 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 22:

Principle Start and Stop Sequence of a Measurement After S

tartup with OSR:PD = ‚0‘ and

CREG3:SB = ‚1‘

7.12

Examples

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

BREAK of Figure 52) to avoid disturbances during the A/D conversion caused by I²C interface

communication. The selectable pause time using register BREAK should be long enough, that all

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 4µs is

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

BREAK.

Figure 23 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

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