Measured

Temperature

T

HIGH

T

LOW

TMP105

ALERTPIN

(ComparatorMode)

POL=0

TMP105

ALERTPIN

(InterruptMode)

POL=0

TMP105

ALERTPIN

(ComparatorMode)

POL=1

TMP105

ALERTPIN

(InterruptMode)

POL=1

Read

Read

Time

Read

TMP105

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SLLS648D

– FEBRUARY 2005 – REVISED SEPTEMBER 2011

CONFIGURATION REGISTER

The Configuration Register is an 8-bit read/write register used to store bits that control the operational modes of

the temperature sensor. Read/write operations are performed MSB first. The format of the Configuration register

for the TMP105 is shown in Table 6, followed by a breakdown of the register bits. The power-up/reset value of

the Configuration Register is all bits equal to 0.

Table 6. Configuration Register Format

BYTE

D7

D6

D5

D4

D3

D2

D1

D0

1

OS

R1

R0

F1

F0

POL

TM

SD

SHUTDOWN MODE (SD)

The Shutdown Mode of the TMP105 allows the user to save maximum power by shutting down all device

circuitry other than the serial interface, which reduces current consumption to typically 1.5

μA. Shutdown Mode is

enabled when the SD bit is 1; the device will shut down once the current conversion is completed. When SD is

equal to 0, the device will maintain a continuous conversion state.

THERMOSTAT MODE (TM)

The Thermostat Mode bit of the TMP105 indicates to the device whether to operate in Comparator Mode (TM =

0) or Interrupt Mode (TM = 1). For more information on comparator and interrupt modes, see the High and Low

Limit Registers section.

POLARITY (POL)

The Polarity Bit of the TMP105 allows the user to adjust the polarity of the ALERT pin output. If POL = 0, the

ALERT pin will be active LOW, as shown in Figure 3. For POL = 1, the ALERT pin will be active HIGH, and the

state of the ALERT pin is inverted.

Figure 3. Output Transfer Function Diagrams

Copyright

© 2005–2011, Texas Instruments Incorporated

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