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[v1-03] 2015-Aug-10

AS3715 − Detailed Description – System Functions

I²C Read Access

Random, Sequential and Current Address Read are used to read

data from the slave.

Figure 79:

I²C Random Read

I²C Random Read: Shows the format of an I²C random read access.

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 80:

I²C Sequential Read

I²C Sequential Read: Shows the format of an I²C sequential read access.

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

of the word-address counter). To terminate the transmission the

master has to send a not-acknowledge following the last data

byte and generate the STOP condition subsequently.

A Sr

A data N

RA++

A Sr

A data 1 A data 2 A

...

data n

RA++

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