TMP117 datasheet(13/49 Pages) TI1

13 / 49 page

Shutdown

15.5 ms

(One-Shot Conversion)

TMP117

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SNOSD82A – JUNE 2018 – REVISED OCTOBER 2018

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Device Functional Modes (continued)

7.4.3 One-Shot Mode (OS)

When MOD[1:0] bits are set to 11 in the configuration register, the TMP117 will run a temperature conversion

referred to as a one-shot conversion. After the device completes a one-shot conversion, the device goes to the

low-power shutdown mode. A one-shot conversion cycle, unlike the continuous conversion mode, only consists

of the active conversion time and no standby period. Thus, the duration of a one-shot conversion is only affected

by the AVG bit settings. The CONV bits do not affect the duration of a one-shot conversion. Figure 16 shows a

timing diagram for this mode with an AVG setting of 00. At the end of a one-shot conversion, the Data_Ready

and ALERT flag in the configuration register is set. The Data_Ready flag can be used to determine when the

conversion completes. The user can perform an I2C read on the configuration register or temperature result

monitor the state of the Data_Ready flag on the ALERT pin.

One-shot mode cannot be programmed to a default start-up mode. If the EEPROM is programmed to be in one-

shot mode on start-up, it will default to shutdown mode instead.

Figure 16. One-Shot Timing Diagram With AVG[1:0] = 00

7.4.4 Therm and Alert Modes

The built-in therm and alert functions of the TMP117 can alert the user if the temperature has crossed a certain

temperature limit or if the device is within a certain temperature range. At the end of every conversion, including

averaging, the TMP117 compares the converted temperature result to the values stored in the low limit register

and high limit register. The device then either sets or clears the corresponding status flags in the configuration

TMP117 Datasheet(PDF) 13 Page - Texas Instruments