TMP117MAIDRVT datasheet(13/51 Pages) TI1

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Active conversion time

Conversion Cycle time Conversion Cycle time

tStandby timet

Start of conversion

(Affected by averaging)

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

Conversion Cycle Time

TMP117

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SNOSD82B – JUNE 2018 – REVISED MARCH 2019

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7.4 Device Functional Modes

The TMP117 can be configured to operate in various conversion modes by using the MOD[1:0] bits. These

modes provide flexibility to operate the device in the most power efficient way necessary for the intended

application.

7.4.1 Continuous Conversion Mode

When the MOD[1:0] bits are set to 00 or 10 in the configuration register , the device operates in continuous

conversion mode. The device continuously performs temperature conversions in this mode, as shown in

Figure 16, and updates the temperature result register at the end of every active conversion. 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.

Every conversion cycle consists of an active conversion period followed by a standby period. The device typically

consumes 135 µA during active conversion and only 1.25 µA during the low-power standby period. Figure 16

shows a current consumption profile of a conversion cycle while in continuous current mode. The duration of the

active conversion period and standby period can be configured using the CONV[2:0] and AVG[1:0] bits in the

configuration register, thereby allowing the average current consumption of the device to be optimized based on

the application requirements. Changing the conversion cycle period also affects the temperature result update

rate because the temperature result register is updated at the end of every active conversion.

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

(1)

Figure 16. Conversion Cycle Timing Diagram

7.4.2 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. Engineers can

use the TMP117 for battery-operated systems and other low-power consumption applications because the device

typically only consumes 250 nA in SD mode.

TMP117MAIDRVT Datasheet(PDF) 13 Page - Texas Instruments