Datasheet

Measured
Temperature
T
HIGH
T
LOW
TMP105 ALERTPIN
(ComparatorMode)
POL=0
TMP105 ALERTPIN
(InterruptMode)
POL=0
TMP105 ALERTPIN
(ComparatorMode)
POL=1
TMP105 ALERTPIN
(InterruptMode)
POL=1
Read Read
Time
Read
TMP105
www.ti.com 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 1.5μA. 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
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