Measured

Temperature

T

HIGH

T

LOW

Device ALERT Pin

(Compara tor Mode)

POL =0

Device ALERT Pin

(Interrupt Mode)

POL =0

Device ALERT Pin

(Compara tor Mode)

POL =1

Device ALERT Pin

(Interrupt Mode)

POL =1

Read

Read

Time

Read

TMP175-Q1, TMP75-Q1

SBOS759 – NOVEMBER 2015

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7.5.3.1 Polarity (POL)

The Polarity bit of the TMP175-Q1 lets the user adjust the polarity of the ALERT pin output. If the POL bit is set

to 0 (default), the ALERT pin becomes active low. When the POL bit is set to 1, the ALERT pin becomes active

high and the state of the ALERT pin is inverted. The operation of the ALERT pin in various modes is shown in

Figure 12.

Figure 12. Output Transfer Function Diagrams

7.5.3.2 Fault Queue (F1/F0)

A fault condition is defined as when the measured temperature exceeds the user-defined limits set in the THIGH

and TLOW registers. Additionally, the number of fault conditions required to generate an alert can be programmed

using the fault queue. The fault queue is provided to prevent a false alert resulting from environmental noise. The

fault queue requires consecutive fault measurements in order to trigger the Alert function. Table 9 defines the

number of measured faults that can be programmed to trigger an Alert condition in the device. For the THIGH and

TLOW register format and byte order, see the High- and Low-Limit Registers section.

Table 9. Fault Settings of the TMP175-Q1 and TMP75-Q1

F1

F0

CONSECUTIVE FAULTS

0

0

1

0

1

2

1

0

4

1

1

6

18

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