FDA903D datasheet(29/82 Pages) STMICROELECTRONICS

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FDA903D

Muting function architecture

FDA903D uses a mixed signal approach for muting function.

Muting function is activated by different "mute command signal":



“High voltage mute”: active when Vcc enters in a voltage window over the max voltage;

the window is specified in the electrical parameters table.



“Low Battery mute”: active when Vcc enters in a voltage window under the min voltage;

the window is specified in the electrical parameters table.



“Hardware mute”: active when HWMute pin enters in the voltage window specified in

the electrical parameters table.



Thermal mute”: active when temperature enters in the temperature window over the

max temperature; the window is specified in the electrical parameters table.



“I2C Mute”: active user select mute/play I2C bits.

The mute is achieved by the combination of two separated actuators, “Analog-mute” and

“Digital-mute”.

8.1

Command dependence

Analog and digital mute actuators activation could be different based on the mute command

signal. This is described in the following table:

Table 7. Command dependence

Command signal

When?

Mute

Unmute

Low Battery mute

When Vcc enters inside

the low battery mute

window

Mixed mute. Analog &

Digital, at the same

time (1)

1. User can decide to disable Digital-Mute/Unmute using bit IB13-d6; in this case in all the conditions, (except

I2C Mute), the Mute/Unmute will be purely Analog.

Digital (1)

High Voltage mute

When Vcc enters inside

the high voltage mute

window

Mixed mute. Analog &

Digital, at the same

time (1)

Digital (1)

Thermal Mute

When temperature

enters inside thermal

mute window

Analog

Hardware Mute

When hardware pin

voltage enters inside its

mute window

Mixed mute. Analog &

Digital, at the same

time(1)

Digital (1)

I2C Mute

When I2C mute bits are

selected

Digital

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