8

ALERT / INT output

The STTS22H ALERT / INT output is open drain and requires a pull-up resistor. The ALERT / INT pin is asserted

(low) whenever the temperature is equal to or exceeds the high limit or is below the low limit. Once asserted, the

output will remain asserted until the STTS22H receives an SMBus Alert Response Address (ARA) from the host

and acknowledges with its slave address. The output will be deasserted when the ARA is acknowledged, or the

STATUS register (05h) is read by the I²C interface. If the triggering condition is still true, the output will be

reasserted at the next temperature conversion. The following figure shows how the ALERT / INT output works.

Temperature

Time

ALERT / INT

SMBus ARA acknowledged

Temperature high limit

Temperature low limit

STTS22H

ALERT / INT output

DS12606 - Rev 4

page 17/29