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AS73211

Functional Description

Datasheet

• PUBLIC

DS000556

• v3-01 • 2018-Feb-07

│ 23

OSR programming: 80h, start of

the measurement as stated in the device’s configuration.

Coming from Power Down state activated by OSR:PD = ‚1‘ the AS73211 is active switched on

not unti

l OSR:SS is set to ‚1‘ (together while or with OSR:DOS = 011b). That means the bit

OSR:SS is a direct start condition for the CMD and CONT modes whereas for both SYN modes

also the falling edge at pin SYN is necessary for the startup. The programmed measurement

mode follows after startup marked by the falling edge of the signal path at pin READY. If the

configuration even contains CREG3:SB = ‚1‘ (as the example of Figure 21shows), additionally

after startup time TSTARTPD the wake-up time TSTARTSB of 4µs follows before the

measurement starts.

Figure 21:

Principle Start of the M

easurement from OSR:PD = ‚1‘ and CREG3:SB = ‚1‘

Figure 21 shows the principle start of the measurement from

OSR:PD = ‚1‘ and CREG3:SB = ‚1‘:

CREG3 p

rogramming: bit CREG3:SB = ‚1‘,

OSR programming: C3h, start of the measurement with prior run of TSTARTPD and

TSTARTS.

The programmed energy saving option (before or when measurement is started or while the

measurement runs) is switched on after the regular end of the measurement and storing of the results

within the buffer registe

rs. In case of an abortion of the measurement with OSR:SS = ‚0‘ or switching

to Configuration state the energy saving option is switched on without saving any results.

7.11

Standby

Standby is another option for reducing the power consumption, but compared to Power Down less

internal analog components are switched off to be able to get back active in a very short time. The

digital part of the AS73211 stays idle, but a full communication via the I²C interface is granted in

Configuration state and Measurement state as well. The bit CREG3:SB can only be changed in

Configuration mode. The wake-up process is possible in combination with the start condition of the

configured Measurement mode. Standby is automatically deactivated by starting the CMD or CONT

TSTARTSB

MEASUREMENT

CONFIGURATION

POWDOWN

STATE

I²C activity

OSR

C3h

CREG3:SB ← ‚1'

TSTARTPD

STANDBY

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