TMP112 datasheet(9/25 Pages) TI

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CONFIGURATION REGISTER

CONVERSION RATE

EXTENDED MODE (EM)

Startup

Startof

Conversion

Delay

(1)

26ms

ALERT (AL Bit)

SHUTDOWN MODE (SD)

THERMOSTAT MODE (TM)

TMP112

www.ti.com ......................................................................................................................................................... SBOS473B – MARCH 2009 – REVISED JUNE 2009

The Configuration Register is a 16-bit read/write

The conversion rate bits, CR1 and CR0, configure the

TMP112 for conversion rates of 8Hz, 4Hz, 1Hz, or

modes

the

temperature

sensor.

Read/write

0.25Hz. The default rate is 4Hz. The TMP112 has a

operations are performed MSB first. The format and

typical conversion time of 26ms. To achieve different

power-up/reset values of the Configuration Register

conversion rates, the TMP112 makes a conversion

are shown in Table 7. For compatibility, the first byte

and then powers down and waits for the appropriate

corresponds to the Configuration Register in the

delay set by CR1 and CR0. Table 8 shows the

TMP75 and TMP275. All registers are updated byte

settings for CR1 and CR0.

by byte.

Table 8. Conversion Rate Settings

Table 7. Configuration and Power-Up/Reset

CR1

CR0

CONVERSION RATE

Formats

0.25Hz

BYTE

1Hz

POL

4Hz (default)

8Hz

CR1

CR0

After a power-up or general-call reset, the TMP112

immediately

starts

conversion,

shown

Figure 12. The first result is available after 26ms

(typical).

The

active

quiescent

current

during

The Extended mode bit configures the device for

conversion is 40

µA (typical at +27°C). The quiescent

Normal mode operation (EM = 0) or Extended mode

current during delay is 2.2

µA (typical at +27°C).

operation

(EM

1).

Normal

mode,

the

Temperature

and

high-

and

low-limit

registers use a 12-bit data format. Normal mode is

used to make the TMP112 compatible with the

TMP75.

Extended mode (EM = 1) allows measurement of

temperatures

above

+128°C

configuring

the

Temperature

and

high-

and

low-limit

registers, for 13-bit data format.

(1) Delay is set by CR1 and CR0.

Figure 12. Conversion Start

The AL bit is a read-only function. Reading the AL bit

provides information about the comparator mode

status. The state of the POL bit inverts the polarity of

data returned from the AL bit. For POL = 0, the AL bit

reads as '1' until the temperature equals or exceeds

The Shutdown mode bit saves maximum power by

THIGH for the programmed number of consecutive

shutting down all device circuitry other than the serial

faults, causing the AL bit to read as '0'. The AL bit

interface, reducing current consumption to typically

continues to read as '0' until the temperature falls

less than 0.5

µA. Shutdown mode is enabled when

below

TLOW

for

the

programmed

number

the SD bit = '1'; the device shuts down when current

consecutive faults, when it again reads as '1'. The

conversion is completed. When SD = '0', the device

status of the TM bit does not affect the status of the

maintains a continuous conversion state.

AL bit.

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.

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