7.3 Feature Description

7.3.1 Power Up

After power-up or general-call reset, the TMP144 immediately starts a conversion as shown in Figure 7-1. The

complete in the temperature result register.

Startup

Start of

Conversion

Figure 7-1. Conversion Start

7.3.2 Digital Temperature Output

The TMP144 by default provides a 12-bit digital output for each temperature conversion, which is stored in the

temperature result register. The host application needs to read two bytes to obtain the data. Additionally, the

application may program the ETM bit in the configuration register to get a 13-bit digital output. Table 7-1

summarizes the temperature output format. One LSB equals 0.0625 °C resolution.

Table 7-1. Temperature Data Format

TEMPERATURE (°C)

DIGITAL OUTPUT (ETM = 0)

DIGITAL OUTPUT (ETM = 1)

BINARY (T11-T0)

HEX

BINARY (T12-T0)

HEX

+150

0111 1111 1111

7FF

0 1001 0110 0000

0960

+127.9375

0111 1111 1111

7FF

0 0111 1111 1111

07FF

+125

0111 1101 0000

7D0

0 0111 1101 0000

07D0

+100

0110 0100 0000

640

0 0110 0100 0000

0640

+80

0101 0000 0000

500

0 0101 0000 0000

0500

+75

0100 1011 0000

4B0

0 0100 1011 0000

04B0

+50

0011 0010 0000

320

0 0011 0010 0000

0320

+25

0001 1001 0000

190

0 0001 1001 0000

0190

+0.0625

0000 0000 0001

001

0 0000 0000 0001

0001

0

0000 0000 0000

000

0 0000 0000 0000

0000

-0.0625

1111 1111 1111

FFF

1 1111 1111 1111

1FFF

-25

1110 0111 0000

E70

1 1110 0111 0000

1E70

-40

1101 1000 0000

D80

1 1101 1000 0000

1D80

7.3.3 Timeout Function

A timeout mechanism is implemented on the TMP144 to allow for re-synchronization of the SMAART Wire™

interface if synchronization between the host and the TMP144 is lost for 28 ms (typical). If the timeout period

expires between the calibration byte and the command byte, between the command byte and a data byte, or

between any data bytes, the TMP144 resets the SMAART Wire™ interface circuitry and waits for the baud rate

calibration command to restart. Every time a byte is transmitted on the SMAART Wire™ interface, this timeout

period restarts.

www.ti.com

TMP144

SBOS891A – OCTOBER 2018 – REVISED FEBRUARY 2021

Copyright © 2021 Texas Instruments Incorporated

Submit Document Feedback

9

Product Folder Links: TMP144