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AS73211

Datasheet

• PUBLIC

DS000556

• v3-01 • 2018-Feb-07

│ 54

NDA

TA is set to ‚1‘ to show the update (see Figure 55). With the start of each I²C read operation the

content of all buffer registers is transferred to the result registers. This ensures that during the I²C

readout operation the values of the result registers do not change.

As long as an I²C-reading of the measurement result registers is in process (no I²C stop condition has

been sent), no further update of the measurement result registers concerning to newer data of the

buffer registers will happen.

The status bit NDATA is reset to ‚0‘ after reading the status register or at least one measurement

result register.

Figure 55:

Update Time of the Status Register Bits for an Accurate Measurement and Read Behavior

If the buffer registers contain new values (NDATA = ‚1‘) and then a new measurement finishes before

an I²C reading process occurs, the new measurement results is stored in the buffer registers. The

older measurement results are overwritten. The status bit LDATA as shown in Figure 56 indicates this.

The LDATA bit is only reset to ‚0‘ by reading the status register, because it allows checking for the loss

of information after multiple measurement cycles.

IDLE

MEASUREMENT 2

RESULTS 1

MEASUREMENT 1

CONFIGURATION

IDLE

TCONV

data

fetch

OSR = 83h

start (OSR:SS ← ‚1')

MRES1 …

MRES3

READY

STATE

I²C activity

RESULTS 2

TCONV

start (OSR:SS ← ‚1')

LDATA = ‚0'

NDATA = ‚0'

data

fetch

LDATA = ‚0'

NDATA = ‚1'

LDATA = ‚0'

NDATA = ‚0'

LDATA = ‚0'

NDATA = ‚1'

LDATA = ‚0'

NDATA = ‚0'

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