TMP114 datasheet(17/50 Pages) TI

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8.4 Device Functional Modes

The TMP114 can be configured to operate in continuous or shutdown mode. This flexibility enables designers to

balance the requirements of power efficiency and performance.

8.4.1 Continuous Conversion Mode

When the Mode bit is set to 0b in the configuration register, the device operates in continuous conversion mode.

Figure 8-4 shows the device in a continuous conversion cycle. In this mode, the device can perform multiple

conversions and updates the temperature result register and Data_Ready_Flag in the alert status register at

the end of every active conversion. The typical active conversion time for the device is 6.4 ms with averaging

disabled. When averaging is enabled, the device will convert 8 consecutive times at the beginning of every

conversion period for a typical time of 51.2 ms.

Active conversion time

Conversion interval

(TCONV)

Conversion interval

tStandby timet

(TSTDBY)

Start of conversion

(TACT)

DRDY Flag

2C Temperature Read or

2C Alert Status Read

Figure 8-4. Continuous Conversion Cycle Timing Diagram

The Conv_Period[1:0] bits in the configuration register control the rate at which the conversions are performed.

The device typically consumes 68 µA during conversion and 0.26 µA during the low power standby period. By

decreasing the rate at which the conversions are performed, the application can benefit from reduced average

current consumption in continuous mode.

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

Average Current = ((IACT × tACTIVE) + (IStandby × tStandby)) / tConv_Period

(1)

Where

• tACTIVE = Active Conversion Time

• tConv_Period = Conversion Period

• tStandby = Standby time between conversions calculate as tConv_Period – tACTIVE

8.4.2 Shutdown Mode

When the Mode bit is set to 1b in the Configuration register, the device immediately enters the low-power

shutdown mode. If the TMP114 is performing a temperature conversion, the device will stop the conversion and

discard the partial result. In this mode, the device powers down all active circuitry and can be used in conjunction

with the One_Shot bit to perform One-Shot temperature conversions. Shutdown mode enables designers to

extend battery life as the typical power consumption is only 0.16uA in this mode of operation.

Changing between continuous and shutdown modes will not clear any active. The slew rate alert will not be

triggered again in shutdown mode, but previous active alerts will not clear until the alert register is read or a

one-shot temperature conversion is triggered.

www.ti.com

TMP114

SNIS214A – JUNE 2021 – REVISED SEPTEMBER 2021

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