TDA4841PS datasheet(13/60 Pages) PHILIPS

13 / 60 page

1999 Oct 25

Philips Semiconductors

Product speciﬁcation

I2C-bus autosync deﬂection controller for

PC monitors

TDA4841PS

Table 3

Activation of protection mode

When the protection mode is active, several pins of the

TDA4841PS are forced into a defined state:

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

VOUT1 and VOUT2 (vertical outputs) are floating

The capacitor at HPLL2 is discharged.

If the soft start procedure is activated via the I2C-bus, all of

these actions will be performed in a well defined sequence

(see Figs 22 and 23).

ACTIVATION

RESET

Low supply voltage at

pin 10

increase supply voltage,

reload registers,

soft start via I2C-bus

Power dip, below 8.1 V

reload registers,

soft start via I2C-bus or via

supply voltage

X-ray protection XRAY

(pin 2) triggered

reload registers,

soft start via I2C-bus

HPLL2 (pin 30) externally

pulled to ground

release pin 30

Power dip recognition

In standby mode the I2C-bus will only answer with an

acknowledge when data is sent to the control register 1AH.

This register contains the standby and soft start control bit.

If the I2C-bus master transmits data to another register, an

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 TDA4841PS 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

I2C-busses of the monitor during start-up.

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