AAT3603 datasheet(29/35 Pages) ANALOGICTECH

29 / 35 page

AAT3603178

Total Power Solution for Portable Applications

PRODUCT DATASHEET

3603.2008.06.1.0

www .analogictech.com

I2C Serial Interface

and Programmability

Serial Interface

Many of the features of the AAT3603 can be controlled via

the I2C serial interface. The I2C serial interface is a wide-

ly used interface where it requires a master to initiate all

the communications with the slave devices. The I2C pro-

tocol consists of 2 active wire SDA (serial data line) and

SCL (serial clock line). Both wires are open drain and

require an external pull up resistor to VCC (BAT may be

used as VCC). The SDA pin serves I/O function, and the

SCL pin controls and references the I2C bus. I2C protocol

is a bidirectional bus which allows both read and write

actions to take place, but the AAT3603 supports the write

protocol only. Since the protocol has a dedicated bit for

Read or Write access (R/W), when communicating with

AAT3603, this bit must be set to “0”.

The timing diagram in Figure 7 depicts the transmission

protocol.

START and STOP Conditions

START and STOP conditions are always generated by the

master. Prior to initiating a START condition, both the

SDA and SCL pin are idle mode (idle mode is when there

is no activity on the bus and SDA and SCL are pulled to

VCC via external resistor). As depicted in Figure 7, a

START condition is defined to be when the master pulls

the SDA line low and after a short period pulls the SCL

line low. A START condition acts as a signal to all IC’s

that something is about to be transmitted on the BUS.

A STOP condition, also shown in Figure 7, is when the

master releases the bus and SCL changes from low to

high followed by SDA low to high transition. The master

does not issue an ACKNOWLEGE and releases the SCL

and SDA pins.

ACK from slave

START

SCL

SDA

including R/W bit,

Chip Address = 0x98

STOP

ACK

Data

LSB

MSB

LSB

Chip

Address

MSB

LSB

Address

MSB

Figure 7: I2C Timing Diagram.

AAT3603 Datasheet(PDF) 29 Page - Advanced Analogic Technologies

AAT3603 Datasheet(HTML) 29 Page - Advanced Analogic Technologies

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35

Datasheet Download

Link URL