TDA4856/V6,112 NXP Semiconductors, TDA4856/V6,112 Datasheet - Page 13

• Manufacturer Part Number: TDA4856/V6,112
• Manufacturer: NXP Semiconductors

Specifications of TDA4856/V6,112

• Lead Free Status / RoHS Status: Compliant

Philips Semiconductors
Table 3 Activation of protection mode
When the protection mode is active, several pins of the
TDA4856 are forced into a defined state:
If the soft start procedure is activated via the I
these actions will be performed in a well defined sequence
(see Figs 22 and 23).
2003 Sep 30
Low supply voltage at
pin 10
Power dip, below 8.1 V
X-ray protection XRAY
(pin 2) triggered
HPLL2 (pin 30) externally
pulled to ground
HDRV (horizontal driver output) is floating
BDRV (B+ control driver output) is floating
HUNLOCK (indicates, that the frequency-to-voltage
converter is out of lock) is floating (HIGH via external
pull-up resistor)
CLBL provides a continuous blanking signal
The capacitor at HPLL2 is discharged.
I
PC monitors
2
C-bus autosync deflection controller for
ACTIVATION
increase supply voltage,
reload registers,
soft start via I
reload registers,
soft start via I
supply voltage
reload registers,
soft start via I
release pin 30
RESET
2
2
2
C-bus or via
C-bus
C-bus
2
C-bus, all of
13
Power dip recognition
In standby mode the I
acknowledge when data is sent to the control register 1AH.
This register contains the standby and soft start control bit.
If the I
acknowledge is given after the chip address and the
subaddress; an acknowledge is not given after the data.
This indicates that data can be stored into normal registers
only in soft start mode.
If the supply voltage drops below 8.1 V the deflection
controller leaves normal operation and changes to standby
mode. The microcontroller can check this state by sending
data into a register with the subaddress 0XH.
The acknowledge will only be given on the data if the IC is
active.
Due to this behaviour the start-up of the TDA4856 is
defined as follows: the first data that is transferred to the
deflection controller must be sent to the control register
with subaddress 1AH. Any other subaddress will not lead
to an acknowledge. This is a limitation in checking the
I
2
C-busses of the monitor during start-up.
2
C-bus master transmits data to another register, an
2
C-bus will only answer with an
Product specification
TDA4856