3 power-up/power-down, 1 power-up, Tfa9812 – NXP Semiconductors TFA9812 User Manual
Page 13: Nxp semiconductors
TFA9812_2
© NXP B.V. 2009. All rights reserved.
Preliminary data sheet
Rev. 02 — 22 January 2009
13 of 66
NXP Semiconductors
TFA9812
BTL stereo Class-D audio amplifier with I
2
S input
8.3 Power-up/power-down
8.3.1 Power-up
describe the power-up timing while
shows the pin control
for initiating a power-up reset.
[1]
Mute in Legacy mode is controlled by AVOL pin.
Fig 3.
Power-up/power-down timing
external
voltage
supplies
POWERUP
pin
I
2
C
available
ENABLE
pin
PWM
outputs
t
wake
t
d(on)
t
d(mute_off)
t
d(soft_mute)
010aaa219
soft mute
setting in
I
2
C mode
AVOL pin
in Legacy
mode
Operating
mode active
Table 10.
Power-up/power-down timing
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
t
wake
wake-up
time
I
2
C control
-
4
-
ms
t
d(on)
turn-on
delay time
-
70
-
135
ms
t
d(mute_off)
mute off
delay time
-
-
-
128/f
s
s
t
d(soft_mute)
Soft mute
delay time
I
2
C control
-
-
128/f
s
s
legacy
control
-
15
-
ms