AS3415 datasheet(61/102 Pages) AMSCO

61 / 102 page

ams Datasheet, Confidential: 2014-Jun-13 [v1-30]

AS3415/AS3435 – 61

Detaile d Desc rip t ion

Figure 78:

Page Write

Byte Write and Page Write formats are used to write data to the

slave. The transmission begins with the START condition, which

is generated by the master when the bus is in IDLE state (the

bus is free). The device-write address is followed by the word

address. After the word address any number of data bytes can

be sent to the slave. The word address is incremented internally,

in order to write subsequent data bytes to subsequent address

locations.

For reading data from the slave device, the master has to change

the transfer direction. This can be done either with a repeated

START condition followed by the device-read address, or simply

with a new transmission START followed by the device-read

address, when the bus is in IDLE state. The device-read address

is always followed by the 1st register byte transmitted from the

slave. In Read Mode any number of subsequent register bytes

can be read from the slave. The word address is incremented

internally.

Figure 79:

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.

reg_data 1

write register

WA++

reg_data 2

write register

WA++

reg_data n

write register

WA++

...

read register

WA++

data

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