AS3668 datasheet(25/60 Pages) AMSCO

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AS3668

Data Sheet - D e t a i l e d D e s c r i p t i o n

Figure 34. Reading n Bytes from AS3668

8.6.3

I²C Device Address Selection

The AS3668 features two I²C slave addresses without having a dedicated address selection pin. The selection of the I²C address is done with

the interconnection of AS3668 to the bus lines shown in Figure 35 below. The serial interface logic inside AS3668 is able to distinguish between

a direct I2C connection to the master or a second option where data and clock line are crossed. Therefore it is only possible to address a

maximum of two AS3668 slaves on one I²C bus.

Figure 35. I²C Address Selection Application Diagram

The I²C addresses for the devices in the different connection modes can be found in Table 22.

8.7 Operating Modes

Due to the reason that AS3668 has no dedicated enable or power - on pin the device is basically controlled with the I²C signal lines SDA and

SCL. If the voltages on these pins are less than VPOR_PERI for > tPOR_DEB and GPIO/AUDIO_IN input is low, the AS3668 is in shut down

mode with a minimized current consumption of IVBAT = 1 A (typ.). All blocks inside AS3668 are basically switched off except the power up reset

circuit is always active.

Table 22. I²C Addresses for AS3668

DEVICE Number

7 bit I²C address

8 Bit read address

8 Bit write address

1(default)

0x42

0x85

0x84

0x43

0x87

0x86

From Master to Slave

From Slave to Master

First Data Byte

Second Data Byte

Slave Address

Not Acknowledge

from Master

Acknowledge

from Master

Acknowledge

from AS3668

R/W

AS3668 Registers

Autoincrement

Memory Word

Address

n Bytes

Autoincrement

to next address

Stop reading

DEVICE 1

DEVICE 2

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