TMP1827 datasheet(27/68 Pages) TI

27 / 68 page

The alert status flag and IO2/ALERT pin are deasserted only when the host reads the status register or performs

a successful ALERTSEARCH command as shown in Figure 8-17.

ALERT_HIGH

ALERT_LOW

Temperature

Temperature conversions

ALERT_HIGH

ALERT_LOW

Alert Status Read

ALERT pin

ALERT_LOW+HYSTERESIS

ALERT_HIGH-HYSTERESIS

Figure 8-17. Alert Mode Timing Diagram

8.4.2.2 Comparator Mode

The device operates in comparator mode, when the ALERT_MODE is set as '1b'. In the alert mode of operation,

the alert status flag and IO2/ALERT pin are asserted when the last temperature conversion is either higher than

the temperature alert high limit or when it is lower than the temperature alert low limit register.

The alert status flag and IO2/ALERT pin are deasserted only when the result of the last temperature conversion

is less than the temperature alert high limit minus the hysteresis or above the temperature low limit plus the

hysteresis as shown in Figure 8-18. The hysteresis is selectable using the HYSTERESIS bit field in the device

configuration-2 register.

ALERT_HIGH

ALERT_LOW

Temperature

Temperature conversions

ALERT_HIGH

ALERT_LOW

Alert Status Read

ALERT pin

ALERT_LOW+HYSTERESIS

ALERT_HIGH-HYSTERESIS

Figure 8-18. Comparator Mode Timing Diagram

8.4.3 Single-Wire Interface Communication

To leverage the features effectively, the device access consists of 3 distinct phases. As shown in Figure 8-19,

any bus communication starts with a bus reset condition to which every device on the bus must respond. This is

www.ti.com

TMP1827

SBOSA15 – SEPTEMBER 2022

Submit Document Feedback

Product Folder Links: TMP1827

TMP1827 Datasheet(PDF) 27 Page - Texas Instruments