Texas Instruments TMP112EVM, User Manual

Page: 15 / 25

www.ti.com
TMP112EVM Software Overview
5.2.5 Shutdown Mode
The TMP112 has a built-in shutdown mode that allows the device to stop consuming power. The
shutdown mode selection box (shown in
Figure 16 ) can also be used to clear the Alert pin when the
interrupt mode (refer to Section 5.2.7 ) is selected. Note that the TMP112EVM cannot perform temperature
conversions while in shutdown mode.
Figure 16. Active and Shutdown Mode
5.2.6 Extended Mode
The TMP112EVM has two modes for storing converted temperature data (extended mode and normal
mode), as shown in
Figure 17 . Normal mode provides the temperature, T
LOW
, and T
HIGH
registers 12 bits of
accuracy. By changing to extended mode, the user increases to 13 bits of accuracy and adjusts the full-
scale value of the three registers from 120°C to 150°C. Note that adding an additional bit of accuracy also
changes the current T
HIGH
and T
LOW
values; these values must then be reset to the user's original, intended
values after adjusting the extended mode drop-down box.
Figure 17. Extended and Normal Mode
5.2.7 Thermostat Mode
Thermostat mode, in the Configuration box, allows the user to designate how the TMP112 Alert pin
behaves when the temperature register exceeds the T
HIGH
register. When the TMP112EVM software is in
comparator mode, the Alert pin triggers if the temperature measured by the TMP112 exceeds the T
HIGH
register for the set amount of faults, as described in the Fault Queue (see Section 5.2.9 ). When the Alert
pin is triggered, it remains triggered until the temperature measured by the TMP112 falls below the T
LOW
register value for the set amount of faults.
When the TMP112EVM software is in interrupt mode, the Alert pin does not automatically clear after
falling below the T
LOW
register limit. Instead, the user must either select the Read All Reg button or put the
device into shutdown mode, as described in Section 5.2.5 . After the Read All Reg button is selected, or
after the device is put into shutdown mode, the Alert pin clears when the measured temperature drops
down below the T
LOW
register. Figure 18 shows the thermostat mode dialog.
Figure 18. Comparator and Interrupt Mode
15 SBOU144 – August 2014 TMP112EVM Evaluation Board and Software Tutorial
Submit Documentation Feedback
Copyright © 2014, Texas Instruments Incorporated