TDA4841 datasheet(40/60 Pages) PHILIPS

40 / 60 page

1999 Oct 25

Philips Semiconductors

Product speciﬁcation

I2C-bus autosync deﬂection controller for

PC monitors

TDA4841PS

Fig.20 I2C-bus flow for any mode.

(1) See Fig.18.

handbook, full pagewidth

MGM079

(ANY Mode)

Power-Down Mode

no acknowledge is given by IC

all register contents are random

L1 (1)

VCC < 8.1 V

VCC

a soft-down sequency followed by a

soft start sequence is generated

internally.

8.6 V

8.1 V

VCC

IC enters standby mode.

8.6 V

8.1 V

Power-down mode

Power dip of VCC < 8.6 V:

• The soft-down sequence is started first

• Then the soft-start sequence is generated internally.

Power dip of VCC < 8.1 V or VCC shut-down:

• This function is independent from the operating mode,

therefore it works under any condition

• All driver outputs are immediately disabled

• IC enters standby mode.

Standby mode detection

Execute data transmission twice to assure that there was

no data transfer error.

MGS276

yes

chip address

8CH

0XH

XXH

subaddress

data

I2C-bus transmission

Normal operation

acknowledge was

given on data?

yes

chip address

8CH

0XH

XXH

subaddress

data

I2C-bus transmission

acknowledge was

given on data?

Standby mode

Fig.21 Possible standby mode detection.

TDA4841 Datasheet(PDF) 40 Page - NXP Semiconductors

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