AS3709 datasheet(37/74 Pages) AMSCO

37 / 74 page

ams Datasheet, Confidential: 2013-Aug [1-02]

AS3709 – 37

Detaile d Desc rip t ion - S y st em Fu nc tions

I²C Read Access

Random, Sequential and Current Address Read are used to read

data from the slave.

Figure 48:

I²C Random Read

Random Read and Sequential Read are combined formats. The

repeated START condition is used to change the direction after

the data transfer from the master.

The word address transfer is initiated with a START condition

issued by the master while the bus is idle. The START condition

is followed by the device-write address and the word address.

In order to change the data direction a repeated START

condition is issued on the 1st SCL pulse after the acknowledge

bit of the word address transfer. After the reception of the

device-read address, the slave becomes the transmitter. In this

state the slave transmits register data located by the previous

received word address vector. The master responds to the data

byte with a not-acknowledge, and issues a STOP condition on

the bus.

Figure 49:

I²C Sequential Read

Sequential Read is the extended form of Random Read, as more

than one register-data bytes are transferred subsequently. In

difference to the Random Read, for a sequential read the

transferred register-data bytes are responded by an

acknowledge from the master. The number of data bytes

transferred in one sequence is unlimited (consider the behavior

data

AA Sr

N P

SDW

read register

WA++

data

reg_data 2

...

reg_data n

AA Sr

N P

SDW

read register

WA++

read register

WA++

read register

WA++

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