TDF8599 NXP Semiconductors, TDF8599 Datasheet - Page 7

• Manufacturer Part Number: TDF8599
• Description: I2C-bus controlled dual channel 43 W/2 W single channel 85 W/1 W class-D power amplifier
• Manufacturer: NXP Semiconductors

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NXP Semiconductors
TDF8599_1
Product data sheet
8.2 Mode selection
The TDF8599 includes integrated common circuits for all channels such as the oscillator,
all reference sources, mode functionality and a digital timing manager. In addition, the
built-in protection includes thermal foldback, temperature, overcurrent and overvoltage
(load dump).
The TDF8599 operates in either I
DC load detection, frequency hopping and extended configurability are provided together
with enhanced diagnostic information.
The mode pins EN and SEL_MUTE enable mute state, I
mode switching.
Pin SEL_MUTE is used to mute and demute the device and must be connected to an
external capacitor. This capacitor generates a time constant which is used to ensure
smooth fade-in and fade-out of the input signal.
When pin EN is LOW, the TDF8599 is off and the supply current is at its lowest value
(typically 2 A). When off, the TDF8599 is completely deactivated and will not react to
I
A resistor connected between pin ADS and ground determines if the TDF8599 is in
I
leaving the connection between pin ADS and pin GND open. In I
HIGH, the TDF8599 is in Standby mode and will wait for further commands.
Non-I
the default TDF8599 state is Mute mode. The amplifiers switch idle (50 % duty cycle) and
the audio signal is suppressed at the output. In addition, the capacitor (C
to half the supply voltage. To enter Operating mode, pin SEL_MUTE must be released
(see
I
Switches S1 and S2 are illustrated in
2
2
2
Fig 4.
C-bus commands. The TDF8599 is enabled when pin EN is HIGH.
C-bus mode or in non-I
C-bus mode and non-I
Figure
2
a. non-I
C-bus mode is selected by connecting pin ADS to pin GND. In non-I
3.3 V
Mode selection
4) and capacitor (C
S2
2
S1
C-bus mode
SEL_MUTE
Rev. 01 — 13 November 2008
C ON
EN
2
2
C-bus mode control are described in
C-bus mode (see
TDF8599
001aai769
ON
2
) charged by an internal pull-up.
C-bus mode or non-I
Figure
Class-D power amplifier with load diagnostics
Section
4.
b. I
9). I
3.3 V
2
2
2
C-bus mode
C-bus mode. In I
2
C-bus mode is selected by
C-bus mode and Operating
S2
C ON
SEL_MUTE
Table 4
2
C-bus mode with pin EN
EN
and
TDF8599
© NXP B.V. 2008. All rights reserved.
TDF8599
SVRR
2
C-bus mode,
2
Table
001aai770
C-bus mode,
) is charged
5.
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