AS3675 datasheet(71/81 Pages) AMSCO

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AS3675

Datasheet - D e ta i l e d D e s c r i p t i o n

Definitions used in the serial data transfer format diagrams are listed in the following table:

Figure 36. Serial Interface Byte Write

Figure 37. Serial Interface 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 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 AS3675.

Figure 38. Serial Interface Random Read

Table 93. Serial Data Transfer Byte Definitions

Symbol

Definition

R/W (AS3675 Slave)

Note

Start Condition after Stop

1 bit

Repeated Start

1 bit

Device Address for Write

10000000b (80h).

Device Address for Read

10000001b (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

reg_data

A P

Write Register

WA++

AS3675 (= Slave) receives data

AS3675 (= Slave) transmits data

reg_data 1

reg_data 2

…

reg_datan

A P

Write Register

WA++

Write Register

WA++

Write Register

WA++

AS3675 (= Slave) receives data

AS3675 (= Slave) transmits data

A Sr

data

N P

Read Register

WA++

AS3675 (= slave) receives data

AS3675 (= slave) transmits data

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