TMP117 datasheet(12/45 Pages) TI1

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Shutdown

15.5 ms

(One-Shot Conversion)

(Active Current Consumption Active Conversion Time) + (Standby Current Consumption Standby Time)

Conversion Cycle Time

TMP117

SNOSD82 – JUNE 2018

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Device Functional Modes (continued)

Use Equation 1 to calculate the average current consumption of the device in continuous mode.

(1)

7.4.1.3 Continuous Conversion Mode (CC)

When the MOD[1:0] bits are set to 00 in the configuration register , the device operates in continuous conversion

mode. The device continuously performs temperature conversions in this mode, as shown in Figure 14, and

updates the temperature result register at the end of every conversion. As described in the Conversion Cycle

section, every conversion cycle consists of an active conversion period followed by a standby period whose

duration can be configured using the CONV and AVG bits in the configuration register based on the temperature

accuracy, power consumption, and temperature update rate trade-offs of the application that the device is used

in. At the end of a conversion, the Data_Ready flag in the configuration register is set. The user can read the

configuration register or the temperature result register to clear the Data_Ready flag. Therefore, the Data_Ready

flag can be used to determine when the conversion completes so that an external controller can synchronize

reading the result register with conversion result updates. The user can set the DR/nAlert_EN bit in the

configuration register to monitor the state of the Data_Ready flag on the ALERT pin.

7.4.1.4 Shutdown Mode (SD)

When the MOD[1:0] bits are set to 01 in the configuration register, the device instantly aborts the currently

running conversion and enters a low-power shutdown mode. In this mode, the device powers down all active

circuitry and can be used in conjunction with the OS mode to perform temperature conversions. In SD mode, the

device typically consumes only 250 nA, which makes the TMP117 suitable for battery-operated systems and

other low-power consumption applications.

7.4.1.5 One-Shot Mode (OS)

When MOD[1:0] bits are set to 11 in the configuration register to run a single conversion, referred to as a one-

shot conversion. After the device completes a one-shot conversion, the device returns to the low-power

shutdown mode. A one-shot conversion cycle only consists of active conversion time and no standby period,

unlike CC mode. 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 flag in the configuration register is set.

The Data_Ready flag can thus be used to determine when the conversion completes. The user can perform an

I2C read on the configuration register or temperature result register to clear the Data_Ready flag. The user can

also set the DR/nAlert_EN bit in the configuration register to monitor the state of the Data_Ready flag on the

ALERT pin.

Figure 16. One-Shot Timing Diagram

7.4.2 Therm and Alert Functions

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, the

TMP117 compares the converted temperature result to the values stored in the low limit register and high limit

described in this section.

TMP117 Datasheet(PDF) 12 Page - Texas Instruments

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