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TDA7803A-QLX bảng dữ liệu(PDF) 34 Page - STMicroelectronics

tên linh kiện TDA7803A-QLX
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TDA7803A-QLX bảng dữ liệu(HTML) 34 Page - STMicroelectronics

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Functional description
TDA7803A
34/72
DS12195 Rev 7
6.9
Mute management
The transition Mute → Play can happen once the device is in amplifier mode and IB2-
D3/D4 = "1" or after it has been put in mute for one of the causes listed in Table 9. It is done
by means of a digital ramp whose time constant is programmable by IB2 D7, D6 and D5
bits.
The transition Play → Mute occurs when certain conditions are verified and it can be Digital
or Analog. An overview of all the events that might happen is reported in the Table 9.
8 V
01101011
9 V
01111001
10 V
10000110
11 V
10010100
12 V
10100010
13 V
10101111
14 V
10111101
14.4 V
11000010
15 V
11001011
16 V
11011001
17 V
11100110
18 V
11110100
19 V
11111111
Table 8. VCC value express by 8 bit with thermometric code (continued)
VCC
ADC value
Table 9. Transition play to mute strategy
Cause of transition
Play
→ Mute
When it happens
Analog
Digital
I2C instruction
When bit IB2 D4,D3 = “0” (Mute
command)
No
Yes
Timing for transition is fixed by IB2 D7, D6, D5
Low battery mute
When there is a battery dip and
the Vs goes below the auto
mute threshold (selectable by
IB2 D1)
Yes
IB2-D2 = 0: Yes
IB2-D2 = 1: Disable
If digital mute is enabled, timing for transition is
fixed by IB2 D7-D6-D5
High battery mute
When Vs ramp up above 19V
Yes
No
PLL un-lock
The PLL lock detector goes
down for some reason
Yes
Not possible because in case of un-lock, digital
core is reset so not working
Thermal mute
When Tw1 is “1”
Yes
Disabled
Tristate command
No
Yes
Timing for transition is fixed by IB2-D7, D6, D5



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