TMP116 datasheet(12/46 Pages) TI2

12 / 46 page

Standby

15.5 ms

1 Conversion Cycle

15.5 ms

Start-Up

Start of

Conversion

Active Conversion

TMP116, TMP116N

SBOS740A – MAY 2017 – REVISED MAY 2019

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7.4 Device Functional Modes

7.4.1 Temperature Conversions

The TMP116 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 required for the intended

application.

7.4.1.1 Conversion Cycle

When the device is operating in continuous conversion mode (see the Continuous Conversion Mode (CC)

section), every conversion cycle consists of an active conversion period followed by a standby period. During

active conversion the device typically consumes 135 µA, and during the low-power standby period the device

typically consumes 1.25 µA, as indicated in Table 1. Figure 19 shows a current consumption profile of a

conversion cycle. 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

conversion or averaging cycle.

Figure 19. Conversion Cycle Timing Diagram

7.4.1.2 Averaging

Noise in the conversion result can be reduced by configuring the device to report the average of multiple

temperature conversions using the AVG[1:0] bits. When the TMP116 is configured to perform averaging, the

device executes the configured number of conversions while accumulating the results and reports the average of

all conversion results at the end of the process. As illustrated in the noise histograms of Figure 6 and Figure 7,

the temperature result output has a repeatability of approximately ±3 LSBs when there is no averaging and ±1

LSB when the device is configured to perform eight averages or higher. As illustrated in Figure 20, this

improvement in noise performance is achieved with the tradeoff of an increase in the active conversion time in a

conversion cycle, thereby increasing the average active current consumption. For example, a single active

conversion typically takes 15.5 ms so if the device is configured to report an average of eight conversions then

the active conversion time is 124 ms (15.5 ms × 8). Use Equation 1 to factor in this increase in active conversion

time to accurately calculate the average current consumption of the device. The average current consumption of

the device can be decreased by increasing the amount of time the device spends in standby period as compared

to active conversion. Under the factory EEPROM settings, the device is configured to report an average of eight

conversions with a conversion cycle time of 1 second.

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