STTS2004 datasheet(12/58 Pages) STMICROELECTRONICS

12 / 58 page

Serial communications

STTS2004

12/58

DocID024229 Rev 3

2.2

Pin descriptions

2.2.1

A0, A1, A2

A2, A1, and A0 are selectable address pins for the 3 LSBs of the I2C interface address.

These inputs must be tied to VDD or GND as shown in Figure 3 to provide 8 unique address

selections. These pins are internally connected to the A2, A1, A0 (slave address inputs) of

the EEPROM.

Figure 3. Device select code

2.2.2

VSS (ground)

This is the reference for the power supply. It must be connected to system ground.

2.2.3

SDA (open drain)

This is the serial data input/output pin. SDA(out) is an open drain output that may be wire-

OR’ed with other open drain or open collector signals on the bus. A pull-up resistor must be

connected from Serial Data (SDA) to VDD. Figure 20 indicates how the value of the pull-up

resistor can be calculated.

2.2.4

SCL

This is the serial clock input pin.

2.2.5

EVENT (open drain)

This output pin is open drain and active-low. A pull-up resistor must be connected to this pin.

2.2.6

VDD (power)

This is the supply voltage pin, and ranges from 2.2 V to 3.6 V.

VDD

STTS2004

GND

A(n)

STTS2004 Datenblatt(PDF) 12 Page - STMicroelectronics