AS3412 datasheet(49/84 Pages) AMSCO

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ams Datasheet

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[v1-00] 2016-Apr-06

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AS3412 − Detailed Description

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 65:

Sequential Read

Sequential Read: This figure shows the read sequence for a sequential read command.

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

than one register-data bytes are transferred subsequently.

Different from the Random Read, for a sequential read, the

transferred register-data bytes are responded with 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 then generate the STOP condition.

Figure 66:

Current Address Read

Current Address Read: This figure shows the I²C read sequence.

A Sr

reg_data 1

reg_data 2

...

reg_data n

RA++

reg_data n

data

reg_data 2

...

RA++

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