AS3668_07 datasheet(25/59 Pages) AMSCO

25 / 59 page

www.ams.com/AS3668

Revision 1.13

25 - 59

AS3668

Data Sheet - Detailed Description

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 = 1μA (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

A/A

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

AS3668 Datasheet(PDF) 25 Page - ams AG

AS3668 Datasheet(HTML) 25 Page - ams AG

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59

Datasheet Download

Link URL