50

60

70

80

90

100

THERM2

THERM Limit

THERM Limit - Hysteresis

THERM

110

120

130

140

150

Temperature Conversion Complete

Time

Measured

Temperature

THERM2 Limit

THERM2 Limit - Hysteresis

50

60

70

80

90

100

ALERT

THERM Limit

THERM Limit - Hysteresis

High Temperature Limit

THERM

110

120

130

140

150

Temperature Conversion Complete

Time

Measured

Temperature

ALERT output

serviced by master

TMP451-Q1

SLOS877 – OCTOBER 2014

www.ti.com

7.3.6

ALERT and THERM Functions

The operation of the ALERT (pin 6) and THERM (pin 4) interrupts is shown in Figure 13. The operation of the

THERM (pin 4) and THERM2 (pin 6) interrupts is shown in Figure 14.

Figure 13. ALERT and THERM Interrupt Operation

Figure 14. THERM and THERM2 Interrupt Operation

The hysteresis value is stored in the THERM hysteresis register. The value of the CONAL[2:0] bits in the

consecutive ALERT register determines the number of limit violations before the ALERT pin is tripped. The

default value is 000b and corresponds to one violation, 001b programs two consecutive violations, 011b

programs three consecutive violations, and 111b programs four consecutive violations. This provides additional

filtering for the ALERT pin state.

12

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