AS6221T

Register description

Datasheet

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6.2.4

Sleep mode

The sleep mode is activated by setting the bit SM in the configuration register to 1. This shuts

the device down immediately and reduces the power consumption to a minimum value.

The serial interface is the only active circuitry in sleep mode in order to provide access to the

digital registers.

Entering the sleep mode will take some time (120 ms maximum) and the first conversion after

the sleep mode has been entered takes longer than the values specified in Table 4. It is

therefore recommended when entering sleep mode to trigger a single shot conversion at the

same time. After 150 ms (max), the device has then entered the sleep mode and subsequent

conversion times are as specified in Table 4.

After resetting the SM bit to 0, the device enters the continuous conversion mode.

Table 12: Sleep mode configuration

Sleep mode bit

Operation mode

0

Continuous conversion mode

1

Sleep mode

6.2.5

Interrupt mode

The interrupt mode bit defines whether the device operates in the temperature comparator

mode or the interrupt mode. This defines the operation of the ALERT output as described in

the polarity section bit.

Table 13: Interrupt mode configuration

Interrupt mode bit

Configuration mode

0

Comparator mode

1

Interrupt mode

The comparator mode is characterized that if the temperature value exceeds the THIGH value,

the alert output is changed (e.g. from high to low if the polarity bit is set to 0 and vice versa).

The alert output stays in that condition until the measured temperature drops below the defined

TLOW value.

The interrupt mode is characterized that it changes the alert output as soon as the measured

temperature crosses the THIGH or TLOW value threshold.