Startup

Startof

Conversion

Delay

(1)

26ms

26ms

17

TMP112

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SBOS473F – MARCH 2009 – REVISED FEBRUARY 2018

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7.4 Device Functional Modes

7.4.1 Continuos-Conversion Mode

The default mode of the TMP112 family is continuos conversion mode. During continuous-conversion mode, the

ADC performs continuos 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

TMP112 family for conversion rates of 0.25 Hz, 1 Hz, 4 Hz, or 8 Hz. The default rate is 4 Hz. The TMP112 family

has a typical conversion time of 26 ms. To achieve different conversion rates, the TMP112 family makes a

conversion and then powers down and waits for the appropriate delay set by CR1 and CR0. Table 5 lists the

settings for CR1 and CR0.

Table 5. Conversion Rate Settings

CR1

CR0

CONVERSION RATE

0

0

0.25 Hz

0

1

1 Hz

1

0

4 Hz (default)

1

1

8 Hz

After a power-up or general-call reset, the TMP112 family immediately begins a conversion as shown in

Figure 14. The first result is available after 26 ms (typical). The active quiescent current during conversion is 40

μA (typical at +27°C). The quiescent current during delay is 2.2 μA (typical at +27°C).

(1) Delay is set by CR1 and CR0.

Figure 14. Conversion Start

7.4.2 Extended Mode (EM)

The extended mode bit configures the device for normal mode operation (EM = 0) or extended mode operation

(EM = 1). In normal mode, the temperature register and the high and low limit registers use a 12-bit data format.

Normal mode is used to make the TMP112 family compatible with the TMP75 device.

Extended mode (EM = 1) allows measurement of temperatures above 128°C by configuring the temperature

register and the high and low limit registers for 13-bit data format.

7.4.3 One-Shot/Conversion Ready Mode (OS)

The TMP112 family features a one-shot temperature-measurement mode. When the device is in shutdown

mode, writing a 1 to the OS bit begins a single temperature conversion. During the conversion, the OS bit reads

0. The device returns to the SHUTDOWN state at the completion of the single conversion. After the conversion,

the OS bit reads 1. This feature is useful for reducing power consumption in the TMP112 family when continuous

temperature monitoring is not required.

As a result of the short conversion time, the TMP112 family can achieve a higher conversion rate. A single

conversion typically occurs for 26 ms and a read can occur in less than 20 μs. When using one-shot mode, 30 or

more conversions per second are possible.

7.4.4 Thermostat Mode (TM)

The thermostat mode bit indicates to the device whether to operate in comparator mode (TM = 0 ) or interrupt

mode (TM = 1).