TMP116 datasheet(17/46 Pages) TI2

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TMP116, TMP116N

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SBOS740A – MAY 2017 – REVISED MAY 2019

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7.5 Programming

7.5.1 EEPROM Programming

7.5.1.1 EEPROM Overview

The device consists of a user-programmable EEPROM that can be used for two purposes:

•

Storing the reset values of configuration register and alert registers

•

Four 16-bit locations for general-purpose use; see the EEPROM[4:1] registers

On reset, the device goes through a reset sequence that loads the values programmed in the EEPROM into the

respective register map locations. This process takes approximately 1.5 ms. When the reset sequence is

completed the device starts operating in accordance to the configuration parameters that are loaded from the

EEPROM. Any I2C writes performed during this initial period to the registers are ignored. I2C read transactions

can still be performed with the device during the reset period. While the reset sequence is being executed, the

EEPROM_Busy status flag in the EEPROM unlock register is cleared.

During production, the EEPROM in the TMP116 is programmed with reset values as shown in Table 3. The

Programming the EEPROM section describes how to change these values. Additionally, during production a

unique ID is programmed in the general-purpose EEPROM locations. This unique ID is used to support NIST

traceability. The TMP116 units are 100% tested on a production setup that is NIST traceable and verified with

equipment that is calibrated to ISO/IEC 17025 accredited standards. Only reprogram the general-purpose

EEPROM[4:1] locations if NIST traceability is not desired.

7.5.1.2 Programming the EEPROM

To prevent accidental programming, the EEPROM is locked by default. When locked, any I2C writes to the

Figure 25 illustrates a flow chart describing the EEPROM programming sequence. To program the EEPROM,

first unlock the EEPROM by setting the EUN bit in the EEPROM unlock register. After the EEPROM is unlocked,

any subsequent I2C writes to the register map locations program a corresponding non-volatile memory location in

the EEPROM. Programming a single location typically takes 7 ms to complete and consumes 230 µA. Do not

perform any I2C writes until programming is completed. During programming, the EEPROM_busy flag is set.

Read this flag to monitor if the programming is complete. After programming the desired data, issue a general-

call reset command to trigger a software reset. The programmed data from the EEPROM are then loaded to the

corresponding register map locations as part of the reset sequence. This command also clears the EUN bit and

automatically locks the EEPROM to prevent any further accidental programming. The application must avoid

temperature conversions when the EEPROM is unlocked.

TMP116 датащи(PDF) 17 Page - Texas Instruments