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AS7331

Functional Description

Datasheet

• PUBLIC

DS001047

• v4-00 • 2023-Mar-24

│ 46

Figure 41:

Address(1)

[hex]

Access in Configuration State

Access in Measurement State

Write

Read

Write (1 Byte)

Read (2 Bytes)

OSR

OSR + STATUS

–

TEMP

–

AGEN

–

MRES1 (A)

–

MRES2 (B)

–

MRES3 (C)

–

OUTCONV_L(2)

CREG1

–

OUTCONV_H(2)

CREG2

–

CREG3

–

BREAK

–

EDGES

–

OPTREG

–

(1)

The 4 MSB bits of the register address are ignored.

(2)

OUTCONV is only available in SYND measurement mode with bit

CREG2:EN_TM = “1”. The least significant byte

comes first.

7.8.6

I²C General Procedure to Start with the AS7331

After applying the power supply voltage, the AS7331 is in the configuration state, but in the power

down mode. The user can now set up the device for the application by writing the control registers.

The success of the configuration can be proven by reading the control registers.

Before starting a measurement, the state must be changed to the Measurement state. The last three

bits (DOS) of the register OSR should be loaded with 011b. Now a conversion can be started with the

measurement mode, which is selected by CREG3:MMODE. A falling slope of the output pin READY

indicates the start. The rising edge at pin READY signals the end of conversion, and the measurement

results can be read via I²C communication.

If a new configuration should be implemented, the device’s state needs to be changed to the

configuration state. Therefore the value 010b should be written into the bits OSR:DOS. This operation

resets all measurement result registers to 00h, while the configuration registers keep their actual

values. Afterward, the new configuration can be done.

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