TMP114 datasheet(19/50 Pages) TI

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8.5 Programming

8.5.1 Temperature Data Format

Temperature data is represented by a 16-bit two's complement word with a Least Significant Bit (LSB) equal to

0.0078125 °C. The temperature output of the TMP114 has a range of -256 °C to 255 °C.

Table 8-1. 16-Bit Temperature Data Format

Temperature

Digital Output

Binary

Hex

+125 °C

0011 1110 1000 0000

3E80

+25 °C

0000 1100 1000 0000

0C80

+0.0078125 °C

0000 0000 0000 0001

0001

0 °C

0000 0000 0000 0000

0000

−0.0078125 °C

1111 1111 1111 1111

FFFF

−25 °C

1111 0011 1000 0000

F380

−40 °C

1110 1100 0000 0000

EC00

8.5.2 I2C and SMBus Interface

The TMP114 has a standard bidirectional I2C interface that is controlled by a controller device in order to

be configured or read the status of this device. Each target on the I2C bus has a specific device address

to differentiate between other target devices that are on the same I2C bus. Many target devices require

configuration upon start-up to set the behavior of the device. This is typically done when the controller accesses

internal register maps of the target, which have unique register addresses. A device can have one or multiple

registers where data is stored, written, or read. The TMP114 includes 50-ns glitch suppression filters, allowing

the device to coexist on an I3C mixed bus. The TMP114 supports transmission data rates up to 1 MHz.

The physical I2C interface consists of the serial clock (SCL) and serial data (SDA) lines. Both SDA and SCL

lines must be connected to a supply through a pullup resistor. The size of the pullup resistor is determined by

the amount of capacitance on the I2C lines and the communication frequency. For further details, see the I2C

Pullup Resistor Calculation application report. Data transfer may be initiated only when the bus is idle. A bus is

considered idle if both SDA and SCL lines are high after a STOP condition (see Figure 8-7 and Figure 8-8).

The following is the general procedure for a controller to access a target device:

1. If a controller wants to send data to a target:

• Controller-transmitter sends a START condition and addresses the target-receiver.

• Controller-transmitter sends the requested register to write target-receiver.

• Controller-transmitter sends data to target-receiver.

• Controller-transmitter terminates the transfer with a STOP condition.

2. If a controller wants to receive or read data from a target:

• Controller-receiver sends a START condition and addresses the target-transmitter.

• Controller-receiver sends the requested register to read to target-transmitter.

• Controller-receiver receives data from the target-transmitter.

• Controller-receiver terminates the transfer with a STOP condition.

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TMP114

SNIS214A – JUNE 2021 – REVISED SEPTEMBER 2021

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