FDA803U datasheet(24/76 Pages) STMICROELECTRONICS

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Finite state machine

FDA803U

24/76

DS12497 Rev 2

6.1

Device state and address selection

Through Enable pins configuration it is possible to select different I2C addresses (up to 8) or

to configure the device in 4 different legacy ('no I2C' modes) according to table 6.

In this way, up to 8 devices can be easily used in the same application with a single I2C bus.

Moreover it is possible to work without I2C configuring the voltage range and switching

mode to be used.

When a valid combination of Enable 1/2/3/4 is recognized the device turns on all the internal

supply voltages and outputs are biased to Vcc/2.

The internal I2C registers are pre-settled in "default condition", waiting for the I2C next

instruction.

The return in the Standby condition, (all enable pins at 0), will cause the reset of the

amplifier. As defined in the finite state machine, The same event will happen if PLL is not

locked, I2S is missing or not correct, Vcc for system reset.

FDA803U can work only in I2C slave mode.

Table 6. Operation mode

Enable 1 Enable 2

Enable 3

Enable 4

Stand By

Amplifier ON address 1 = ‘1110000’

Amplifier ON address 2 = ‘1110001’

Amplifier ON address 3 = ‘1110010’

Amplifier ON address 4 = ‘1110011’

Amplifier ON address 5 = ‘1110100’

Amplifier ON address 6 = ‘1110101’

Amplifier ON address 7 = ‘1110110’

Amplifier ON address 8 = ‘1110111’

Legacy mode: low voltage mode; in-phase

Reserved

Legacy mode: standard voltage mode; in-phase

Reserved

FDA803U Datenblatt(PDF) 24 Page - STMicroelectronics