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TMP112

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SBOS473F – MARCH 2009 – REVISED FEBRUARY 2018

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Copyright © 2009–2018, Texas Instruments Incorporated

7.5.2 Temperature Register

The Temperature Register of the TMP112 family is configured as a 12-bit read-only register (setting the EM bit to

0 in the configuration register; see the Extended Mode section), or as a 13-bit read-only register (setting the EM

bit to 1 in the configuration register) that stores the output of the most recent conversion. Two bytes must be

read to obtain data and are listed in Table 8 and Table 9. Byte 1 is the most significant byte (MSB), followed by

byte 2, the least significant byte (LSB). The first 12 bits (13 bits in extended mode) are used to indicate

temperature. The least significant byte does not have to be read if that information is not needed.

Table 8. Byte 1 of Temperature Register

BYTE

D7

D6

D5

D4

D3

D2

D1

D0

1

T11

T10

T9

T8

T7

T6

T5

T4

(T12)

(T11)

(T10)

(T9)

(T8)

(T7)

(T6)

(T5)

(1)

Extended mode 13-bit configuration shown in parentheses.

BYTE

D7

D6

D5

D4

D3

D2

D1

D0

2

T3

T2

T1

T0

0

0

0

0

(T4)

(T3)

(T2)

(T1)

(T0)

(0)

(0)

(1)

7.5.3 Configuration Register

The Configuration Register is a 16-bit read/write register used to store bits that control the operational modes of

the temperature sensor. Read/write operations are performed MSB first. Table 10 lists the format and power-up

and reset values of the configuration register. For compatibility, the first byte corresponds to the Configuration

Register in the TMP75 and TMP275 devices. All registers are updated byte by byte.

Table 10. Configuration and Power-Up/Reset Formats

BYTE

D7

D6

D5

D4

D3

D2

D1

D0

1

OS

R1

R0

F1

F0

POL

TM

SD

0

1

1

0

0

0

0

0

2

CR1

CR0

AL

EM

0

0

0

0

1

0

1

0

0

0

0

0

7.5.3.1 Shutdown Mode (SD)

The Shutdown mode bit saves maximum power by shutting down all device circuitry other than the serial

interface, reducing current consumption to typically less than 0.5 μA. Shutdown mode is enabled when the SD bit

= 1; the device shuts down when current conversion is completed. When SD = 0, the device maintains a

continuous conversion state.

7.5.3.2 Thermostat Mode (TM)

The Thermostat mode bit 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.

7.5.3.3 Polarity (POL)

The polarity bit allows the user to 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 illustrated in Figure 16.