tfa9879hn NXP Semiconductors, tfa9879hn Datasheet - Page 7

• Manufacturer Part Number: tfa9879hn
• Description: Mono Btl Class-d Audio Amplifier For Portable Applications With Digital Input
• Manufacturer: NXP Semiconductors

NXP Semiconductors
TFA9879_1
Preliminary data sheet
9.1.1 Power-up/power-down
9.1 Operating modes
The following protection circuits are built into the TFA9879:
The TFA9879 supports the following operating modes, which are controlled via the
I
The TFA9879 device control settings are detailed in
The power-up and power-down timing of the TFA9879 is illustrated in
external power supply levels, V
ranges before the operating mode is selected. Bit POWERUP in the Device control
register
OPMODE. After the turn-on delay (t
un-mute function. A soft mute function is generated when OPMODE is set to 0. The
TFA9879 should be set to Power-down mode before the power supplies are disconnected
or turned off.
2
•
•
•
•
•
•
C-bus interface:
•
•
•
OverTemperature Protection (OTP)
OverCurrent Protection (OCP)
UnderFrequency Protection (UFP)
OverFrequency Protection (OFP)
Invalid Bit-clock Protection (IBP)
DC-blocking
Power-down mode, used to switch off the device; current consumption is reduced to
a minimum; the I
Off mode, in which the class-D amplifier is switched off; the TFA9879 is completely
biased and the PWM outputs are disabled.
Amplifier mode, in which the digital inputs are used to generate a signal between
OUTA and OUTB.
(Table
21) must be set to 1 before the operating mode can be selected via bits
All information provided in this document is subject to legal disclaimers.
2
C-bus remains operational; the PWM outputs are disabled.
Rev. 01 — 8 April 2010
DDP
Mono BTL class-D audio amplifier with digital input
and V
d(on)
), the device automatically generates a soft
DDD
, should be within the specified operating
Table
21.
Figure
TFA9879
© NXP B.V. 2010. All rights reserved.
3. The
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