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AS6221

Datasheet

• PUBLIC

DS000751

• v3-00 • 2022-Feb-28

│ 18

6.2.7

Consecutive Faults

A fault condition persists if the measured temperature either exceeds the configured value in register

THIGH or falls below the defined value in register TLOW. As a result, the ALERT pin 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.

Figure 21:

Consecutive Faults Bit Settings

Consecutive Fault Bits

Consecutive Faults (N)

Bit 13

Bit 12

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 Sleep

Mode 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.

Figure 22:

Single Shot Conversion Bit Settings

Single Shot Bit

Conversion

No conversion ongoing/ conversion finished

Start single shot conversion / conversion ongoing

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