AS6221T

Register description

Datasheet

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indicates the fault condition if a defined number of consecutive temperature readings meets

this fault condition. The number of consecutive faults are defined with two bits (12 and 11) and

prevent a false alert if environmental temperature noise is present. The register configuration is

shown in the following table.

Table 15: Consecutive fault bit settings

Consecutive fault bits

Consecutive faults (N)

Bit 12

Bit 11

0

0

1

0

1

2

1

0

3

1

1

4

6.2.8

Single shot conversion

The device features a single shot measurement mode if the device is in sleep mode (SM=1).

By setting the “Single Shot-bit” to 1, a single temperature conversion is started and the SS-bit

can be read as 1 during the active conversion operation. Once the conversion is completed,

the device enters the sleep mode again and the SS-bit is set to 0. The single shot conversion

allows very low power consumption since a temperature conversion is executed on demand

only. This allows a user defined timing of the temperature conversions to be executed and is

used if the consecutive operation mode is not required.

The first conversion triggered in this mode has a longer conversion time. In the section 6.2.4 it

is detailed together with the recommendation to trigger the first conversion simultaneously with

entering the sleep mode.

As the device exhibits a very short conversion time, the effective conversion rate can be

increased by setting the single shot bit repetitively after a conversion has finished. However, it

has to be ensured that the additional power is limited, otherwise self-heating effects have to be

considered.

Table 16: Single shot conversion bit settings

Single shot bit

Conversion

0

No conversion ongoing/ conversion finished

1

Start single shot conversion / conversion ongoing