TC35679FSG-002

2018-01-17

23

4.5. I

2C Interface

4.5.1.

Features

TC35679 has the following main features for a serial memory interface.



Operation voltage:

1.8 to 3.6 V



I2C interface



Operation mode:

I2C bus master



Serial clock (I2C-SCL) frequency:

Standard mode (Max 100 kHz), Fast mode (Min 100 kHz to Max 400 kHz)



Output mode:

Open-drain output, CMOS output



Device address format:

7 bits address (10 bits address is not supported)

I2C interface can operate at 1.8 to 3.6 V depending on VDDIO, however, because the power supply pin is shared with I2C interface

and the other hardware interfaces, I2C interface cannot operate at a different voltage from the others.

4.5.2.

Connection Example

Figure 4-14 shows a connection example of a serial EEPROM using I2C bus interface of the open-drain mode. External pull-up

resistors (Rext) are necessary for both serial clock line and serial data line.

Figure 4-15 shows another connection example where I2C bus is in the CMOS output mode. Only the serial data line needs Rext

because this line can be driven by neither TC35679 nor a serial EEPROM.

Figure 4-14 Connection example for serial EEPROM with I

2

C-bus interface (Open-drain output)

Figure 4-15 Connection example for serial EEPROM with I

2

C-bus interface (CMOS output)

TC35679

Serial clock

Serial data read, write

Serial

EEPROM

Rext

VDDIO

Serial

EEPROM

TC35679

Serial clock

Serial data read, write

Serial

EEPROM

Rext

Rext

VDDIO

VDDIO

Serial

EEPROM