TDA4857 datasheet(32/56 Pages) PHILIPS

32 / 56 page

2000 Jan 31

Philips Semiconductors

Product speciﬁcation

I2C-bus autosync deﬂection controller for

PC monitors

TDA4857PS

Table 4

List of I2C-bus 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 internal protection circuit.

CONTROL

BIT

FUNCTION

SAD

(HEX)

D7 D6 D5 D4 D3 D2 D1 D0

BLKDIS

0: vertical, protection and horizontal unlock blanking

available on pins CLBL and HUNLOCK

######D0

1: only vertical and protection blanking available on

pins CLBL and HUNLOCK

HBC

0: HPINBAL (parabola) waveform enabled

#####D1 #

1: HPINBAL (parabola) waveform disabled

HPC

0: HPARAL (sawtooth) waveform enabled

####D2 #

1: HPARAL (sawtooth) waveform disabled

AGCDIS

0: AGC in vertical oscillator active

###D3 ###

1: AGC in vertical oscillator inhibited

VSC

0: VLIN and HCOR adjustments enabled

D4 ####

1: VLIN and HCOR adjustments forced to centre value

MOD

0: horizontal and vertical moire cancellation enabled

D5 #####

1: horizontal and vertical moire cancellation disabled

FHMULT

0: EW output independent of horizontal frequency

######X

1: EW output tracks with horizontal frequency

VOVSCN

0: vertical size 100%

#####D2 X

1: vertical size 116.8% for VGA350

CLAMP

0: trailing edge for horizontal clamp

####D3 #

1: leading edge for horizontal clamp

VBLK

0: vertical blanking = 260

µs

###D4 ##X

1: vertical blanking = 340

µs

VLC

0: VLINBAL adjustment enabled

D5 ###X

1: VLINBAL adjustment forced to centre value

VPC

0: VPOS and HTRAP adjustments enabled

D6 ####X

1: VPOS and HTRAP adjustments forced to centre value

ACD

0: ASCOR disconnected from PLL2

D7 #####X

1: ASCOR internally connected with PLL2

STDBY(3)

0: internal power supply enabled

XXXXXX#

1: internal power supply disabled

SOFTST(3)

0: soft start not released (pin HPLL2 pulled to ground)

XXXXXXD1 #

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

TDA4857 Datasheet(PDF) 32 Page - NXP Semiconductors

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