High Limit

Low Limit

Time

Measured

Temperature

FHx

FLx

Configuration and Temperature

Register Reads

ALERTx Pin

Global Alert Clear x Command

12

TMP107

SBOS716D – MAY 2015 – REVISED JANUARY 2020

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7.3.2 Temperature Limits and Alert

The TMP107 has two ALERTx pins (ALERT1 and ALERT2) for under- and overtemperature monitor functions.

Both pins have independent, dynamically-programmable limits. At the end of each conversion, the temperature

result is compared with the high limit and low limit registers. If the temperature is outside the limit window, the

respective ALERTx pin trips. There are two polarity bits that set the active state of the ALERTx pin. The TMP107

has two flag bits (FHx and FLx) for each alert condition to indicate in which direction the temperature has moved

outside of the limit window.

There are two operating modes used for alerts and flags: therm and alert. In therm mode, the ALERTx pins and

FHx and FLx flags are outputs of a transparent comparator. In alert mode, the ALERTx pins and FHx and FLx

flags are latched interrupts. Select between alert mode or therm mode by using the Tx/Ax (T1/A1 and T2/A2) bits

in the configuration register.

In alert mode (Tx/Ax = 0, default), the high and low limits form a temperature window. At the end of a conversion,

if the temperature result exceeds the high limit or is less than the low limit, the respective flag (either FHx or FLx)

and the ALERTx pin are asserted. If the alert outputs of multiple TMP107s are connected together, the TMP107

tripped alerts are still identifiable. To clear the ALERTx pin, issue a global alert clear x command, or read the

configuration register as shown in Figure 16. To clear the FHx or FLx flag, read the configuration register. Alert-

mode operation is shown in Figure 16.

Figure 16. ALERTx Pin Behavior in Alert Mode (POLx = 0)