7.4 Device Functional Modes

The TMP114 can be configured to operate in continuous or shutdown mode. These modes provide flexibility, to

balance the operation of the device, based on the requirement of power efficiency versus performance.

7.4.1 Continuous Conversion Mode

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

Figure 7-4 shows the device in a continuous conversion cycle. The device can perform multiple conversions in

this mode, and updates the temperature result register and Data_Ready_Flag in the alert status register at the

end of every active conversion. The active conversion time for the device is 5.5 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 44 ms.

Active conversion time

Conversion interval

Conversion interval

Start of conversion

DRDY Flag

I

I

Figure 7-4. 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 66 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.

(1)

Where

7.4.2 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 temperature conversion. Designers can use the TMP114 for battery-operated

systems and other low-power consumption applications because the device typically only consumes 0.16 µA in

Shutdown Mode.

Changing between continuous and shutdown modes will not clear any active alerts in the Alert_Status register

register and the ALERT pin will continue to be asserted until cleared by the controller. The slew rate alert will not

be triggered again in shutdown mode but will not clear until read if it is already active or a one-shot temperature

conversion is triggered.

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TMP114

SNIS214 – JUNE 2021

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