Startup

Startof

Conversion

Delay

(1)

26ms

26ms

NOTE:(1)ThevalueofA0andA1aredeterminedbytheADD0pin.

Frame1SMBusALERTResponseAddressByte

Frame2SlaveAddressFrom Device

StartBy

Master

ACKBy

Device

From

Device

NACKBy

Master

StopBy

Master

1

9

1

9

SDA

SCL

ALERT

0

0

0

1

1

0

0

R/W

1

0

0

1

A1

A0

Status

TMP102

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SBOS397F – AUGUST 2007 – REVISED DECEMBER 2015

Figure 10. Timing Diagram for SMBus Alert

7.4 Device Functional Modes

7.4.1 Continuos-Conversion Mode

The default mode of the TMP102 device is continuos conversion mode. During continuos-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

TMP102 device for conversion rates of 0.25 Hz, 1 Hz, 4 Hz, or 8 Hz. The default rate is 4 Hz. The TMP102

device has a typical conversion time of 26 ms. To achieve different conversion rates, the TMP102 device makes

a conversion and then powers down to wait 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 power-up or general-call reset, the TMP102 immediately starts a conversion, as shown in Figure 11. 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 11. 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 high- and low-limit registers use a 12-bit data format.

Normal mode is used to make the TMP102 device compatible with the TMP75 device.

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

Register, and high- and low-limit registers for 13-bit data format.

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