STTS424E02BDA6E datasheet(7/51 Pages) STMICROELECTRONICS

Part #	STTS424E02BDA6E

Description	Memory module temperature sensor with a 2 Kb SPD EEPROM

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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STTS424E02

Serial communications

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2

Serial communications

The STTS424E02 has a simple 2-wire SMBus™/I2C-compatible digital serial interface

which allows the user to access both the 2 Kbit serial EEPROM and the data in the

temperature register at any time. It communicates via the serial interface with a master

controller which operates at speeds of up to 400 kHz. It also gives the user easy access to

all of the STTS424E02 registers in order to customize device operation.

2.1

Device type identifier (DTI) code

The JEDEC temperature sensor and EEPROM each have their own unique I2C address,

which ensures that there are no compatibility or data translation issues. This is due to the

fact that each of the devices have their own 4-bit DTI code, while the remaining three bits

are configurable. This enables the EEPROM and thermal sensors to provide their own

individual data via their unique addresses and still not interfere with each others’ operation

in any way. The DTI codes are:

●

'0011' for the TS, and

●

'1010' for addressing the EEPROM memory array, and

●

‘0110’ to access the software write protection settings of the EEPROM.

Note:

The EEPROM in the STTS424E02 package has its WC pin internally tied to the VSS

(Ground) pad inside the package while the A0, A1, and A2 pins in the logic diagram (see

Figure 1 on page 8) correspond to the chip enable pins E0, E1 and E2 of EEPROM.

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