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RT5509 数据表(PDF) 15 Page - Richtek Technology Corporation

部件名 RT5509
功能描述  Speaker Amplifier with Speaker Protection
Download  58 Pages
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制造商  RICHTEK [Richtek Technology Corporation]
网页  http://www.richtek.com
标志 RICHTEK - Richtek Technology Corporation

RT5509 数据表(HTML) 15 Page - Richtek Technology Corporation

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RT5509
Copyright © 2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation
DS5509-00
August
2017
www.richtek.com
15
Mode Transition
The state machine of mode transition is shown in
Figure 6.
“Mute” mode is not shown in this figure since
it can be considered as the sub-mode of the normal
Operating mode, only with zero input signal.
The “Off” mode is usually used only in the power down
sequence, and is depicted in the next sub-clause.
After power on, the control bit will always be reset to
PWDN mode.
PWDN
OP
FAULT
SUSP
VDDD, VBAT valid = 1
PWDN = 0 (I
2
C)
BCK valid ?
BCK valid = 1
BCK valid = 0
Fault ?
OTP/OCP/OVP/UVP = 1
OTP/OCP/OVP/UVP = 0
Fault ?
OTP/OCP/OVP/UVP = 0
OTP/OCP/OVP/UVP = 1
PWDN = 1 (I
2
C)
OTP/OCP/OVP/UVP = 1
OTP/OCP/OVP/UVP = 0
(Check every 200ms)
PWDN = 1 (I
2
C)
PWDN = 1 (I
2
C)
Figure 6. Mode Transition
Power ON Sequence
The power on sequence is shown in Figure 7. After
power is valid, two groups of control signals should be
set, without specific order requirement between these
two groups :
1. I2C : PWDN, AMPE, SPKE should be programmed.
These three bits can be programmed by single
command since they are at the same byte address.
2. I2C : I2SDIS, I2SDF, I2SFS set for reference clock
selection for PLL.
I2S : BCK should be valid on the specified interface.
If the PWDN is set to 0 before the BCK valid, it will go
to SUSP mode automatically. The output of amplifier
will be valid after entering OP mode, signal ramp up will
always be implemented when the mode transits from
PWDN or SUSP mode to OP mode.
Power OFF Sequence
The power off sequence is shown in Figure 8. PWDN
mode should be set before the power supplies
disconnected. To avoid pop or click, the amplifier
should be turned off by setting AMPE = 0 before power
down. Soft muting will also be enabled automatically if
AMPDS bit is set to 1, which further ensures a pop-free
procedure.


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