Delay

26 ms

26 ms

Startup

Start of

Conversion

Delay is set by CR1 and CR0

Figure 3. Schematic Diagram of Continuous Conversion

Detailed Description

Device Functional Modes

Continuous Conversion Mode

The default working mode of TMP112B is continuous conversion mode, and the typical conversion time is 26ms.

During continuous conversion mode, the ADC performs continuous temperature conversions and stores each results

to the temperature register, overwriting the result from the previous conversion. The conversion rate bits, CR1 and

CR0, configure the TMP112B for conversion rates of 0.25Hz, 1Hz, 4Hz, or 8Hz. The conversion rate can

be changed by configuring CR1 and CR0, the TMP112B makes a conversion and then powers down

and waits for the appropriate delay set by CR1 and CR0, as shown in Figure 3. Table 1 lists the settings for CR1

and CR0.

Table 1. Conversion Rate Settings

CR1

CR0

CONVERSION RATE

0

0

0.25Hz

0

1

1Hz

1

0

4Hz（default）

1

1

8Hz

Extended Mode

The temperature measurement range of TMP112B is -40°C to +125°C in normal temperature

measurement mode. By setting the EM bit in the configuration register to1, the TMP112B can enter the

extended temperature measurement mode. Extended mode (EM = 1) allows measurement of temperatures above

128°C by configuring the temperature register and the temperature limit registers for 13-bit data format.

The read-only temperature register in TMP112B uses two bytes to store the temperature measurement

results, as shown in Table 8 and Table 9. Byte 1 is the MSB, byte 2 is the LSB, and the upper 12 bits (13 bits in

extended mode) are used to indicate the temperature. It is not necessary to read the LSB when the temperature

information of the LSB is not required.

The data format of the TMP112B temperature measurement results is listed in Table 2 and Table 3, where

1LSB = 0.0625°C, and negative numbers are expressed in binary two's complement format. When powered on or

reset, the temperature register of the TMP112B will be set to 00h until the next temperature conversion is

complete. Unused bits in the temperature register always read as 0 (not shown in the table below).

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