TDA4841 datasheet(35/60 Pages) PHILIPS

35 / 60 page

1999 Oct 25

Philips Semiconductors

Product speciﬁcation

I2C-bus autosync deﬂection controller for

PC monitors

TDA4841PS

List of I2C-bus controlled switches

I2C-bus data can be transmitted in direct or buffered mode and is defined by the MSB of the register subaddress:

• SAD1 is the register subaddress to be used for transmissions in direct mode

• SAD2 is the register subaddress to be used for transmissions in buffered mode.

Table 5

Controlled switches; notes 1 and 2

Notes

1. X = don’t care.

2. # = this bit is occupied by another function. If the register is addressed, the bit values for both functions must be

transferred.

3. Bits STDBY and SOFTST can be reset by the internal protection circuit.

CONTROL

BIT

FUNCTION

SAD1

(HEX)

SAD2

(HEX)

D7 D6 D5 D4 D3 D2 D1 D0

BLKDIS

0: vertical, protection and horizontal unlock

blanking available on pins CLBL and HUNLOCK

######

1: only vertical and protection blanking available

on pins CLBL and HUNLOCK

AGCDIS

0: AGC in vertical oscillator active

######

1: AGC in vertical oscillator inhibited

FHMULT

0: EW output independent of horizontal

frequency

#######

1: EW output tracks with horizontal frequency

VSC

0: VLIN, HCORT and HCORB adjustments

enabled

######

1: VLIN, HCORT and HCORB adjustments

forced to centre value

MOD

0: horizontal and vertical moire cancellation

enabled

#######

1: horizontal and vertical moire cancellation

disabled

VOVSCN

0: vertical size 100%

######

1: vertical size 116.8% for VGA350

CLAMP

0: trailing edge for horizontal clamp

######

1: leading edge for horizontal clamp

VBLK

0: vertical blanking = 260

µs

#######

1: vertical blanking = 340

µs

ACD

0: ASCOR disconnected from PLL2

######

1: ASCOR internally connected with PLL2

STDBY(3)

0: internal power supply enabled

XXXXX

1: internal power supply disabled

SOFTST(3)

0: soft start not released (pin HPLL2 pulled to

ground)

XXXXX

1: soft start is released (power-up via pin HPLL2)

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