TMP110 datasheet(15/44 Pages) TI

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7.3.4 NIST Traceability

The TMP113 offers 3 Unique ID registers (48-bit) to support NIST traceability. These unique IDs can be used to

provide an audit trail to standards provided by the National Institute of Standards and Technology (NIST), a US

Commerce Department agency.

Reading the Unique ID registers requires a specific procedure to retrieve the content from the memory. The

procedure is as follows:

1. Place the device in Shutdown Mode by setting bit 8 of Register 01h (Configuration register) to 1b.

2. Write 0x0000 to desired Unique ID pointer address (0Ch, 0Dh, 0Eh, or 0Fh).

3. Read Unique ID from the same pointer address.

4. Repeat step #2 above for each pointer address as desired.

Note address 0Fh is expected to be read 0x0000 for this device and is reserved for future use. In addition, for

high speed mode, the user must wait 25µs after step-3 and before communicating.

7.4 Device Functional Modes

The TMP113 can be configured to operate in continuous or one-shot (shutdown) mode. This flexibility enables

designers to balance the requirements of power efficiency and performance.

7.4.1 Continuous-Conversion Mode

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

mode. Figure 7-3 shows the device in a continuous conversion cycle. In this mode, the device performs

conversion at fixed periods and updates the temperature result register at the end of every conversion, The

typical active conversion time is 11ms.

Start of

conversion

Ac ve conversion me

(tACT)

Standby Time

(tSTANDBY)

Conversion Period

(tConv_Period)

Figure 7-3. Continuous Conversion Cycle Timing Diagram

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

performed. The device typically consumes 55µA during conversion and 0.85µA during the low power standby

time. By decreasing the rate at which 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 = ((IDD_ACTIVE × tACT) + (IDD_SB × tSTANDBY)) / tConv_Period

(1)

Where

• tACT = Active conversion time

• tConv_Period = Conversion Period

• tSTANDBY = Standby time between conversions calculated as tConv_Period - tACT

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TMP113

SBOSAJ5 – DECEMBER 2024

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