AS3689 datasheet(59/72 Pages) AMSOSRAM

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AS3689

austriami crosyst ems

Datasheet, Confidential

www.austriamicrosystems.com (mlg, ptr)

Revision 1.0.2 / 20070115

57 - 70

Table 26 – Serial Data Transfer Byte Definitions

Symbol

Definition

R/W (AS3689 Slave)

Notes

Start Condition after Stop

1 bit

Repeated Start

1 bit

Device Address for Write

10000010b (80h).

Device Address for Read

10000011b (81h)

Word Address

8 bits

Acknowledge

1 bit

Not Acknowledge

1 bit

reg_data

8 bits

data (n)

1 bit

Stop Condition

8 bits

WA++

Increment Word Address Internally

During Acknowledge

Figure 33 – Serial Interface Byte Write

reg_data

A P

Write Register

WA++

AS3689 (= Slave) receives data

AS3689 (= Slave) transmits data

Figure 34 – Serial Interface Page Write

reg_data 1

reg_data 2

…

reg_data n

A P

Write Register

WA++

Write Register

WA++

Write Register

WA++

AS3689 (= Slave) receives data

AS3689 (= Slave) transmits data

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 on 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.

The following diagrams show the serial read formats supported by the AS3689.

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