STA320

4/37

3

UNLESS OTHERWISE SPECIFIED)

Table 6. GENERAL INTERFACE ELECTRICAL CHARACTERISTICS

Note 1: The leakage currents are generally very small, < 1na. The values given here are maximum after an electrostatic stress on the pin.

Note 2: Human Body Model

Table 7. DC ELECTRICAL CHARACTERISTICS: 3.3V BUFFERS

port SDA_OUT (Slave to Master).

This protocol defines any device that sends data on to the bus as a transmitter and any device that reads the

data as a receiver.

The device that controls the data transfer is known as the master and the other as the slave. The master always

starts the transfer and provides the serial clock for synchronization. The STA320 is always a slave device in all

of its communications. It supported up to 400KB/sec rate (fast-mode bit rate).

4.1 COMMUNICATION PROTOCOL

4.1.1 Data Transition or change

Data changes on the SDA line must only occur when the SCL clock is low. SDA transition while the clock is

high is used to identify a START or STOP condition.

4.1.2 Start Condition

START is identified by a high to low transition of the data bus SDA signal while the clock signal SCL is stable

in the high state. A START condition must precede any command for data transfer.

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

Note

Low Level Input no pull-up

1

µA1

High Level Input no pull-down

2

µA1

Tristate output leakage without

pullup/down

2

µA1

Electrostatic Protection

Leakage < 1

µA2000

V

2

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

Low Level Input Voltage

0.8

V

High Level Input Voltage

2.0

V

Low Level Threshold

Input Falling

0.8

1.35

V

High Level Threshold

Input Rising

1.3

2.0

V

Schmitt Trigger Hysteresis

0.3

0.8

V

Low Level Output

IoI = 100uA

0.2

V

High Level Output

Ioh = -100uA

Ioh = -2mA

VDD3-0.2

2.4

V

V