TDA4857PS Datasheet, PDF (32/56 Pages) NXP Semiconductors – I2C-bus autosync deflection controller for PC monitors

Philips Semiconductors
I²C-bus autosync deflection controller for
PC monitors
Product specification
TDA4857PS
Table 4 List of I²C-bus controlled switches; notes 1 and 2
CONTROL
BIT
FUNCTION
SAD
REGISTER ASSIGNMENT
(HEX) _{D7 D6 D5 D4 D3 D2 D1 D0}
BLKDIS
0: vertical, protection and horizontal unlock blanking
available on pins CLBL and HUNLOCK
01 X # # # # # # D0
1: only vertical and protection blanking available on
pins CLBL and HUNLOCK
HBC
0: HPINBAL (parabola) waveform enabled
01 X # # # # # D1 #
1: HPINBAL (parabola) waveform disabled
HPC
0: HPARAL (sawtooth) waveform enabled
01 X # # # # D2 # #
1: HPARAL (sawtooth) waveform disabled
AGCDIS 0: AGC in vertical oscillator active
01 X # # # D3 # # #
1: AGC in vertical oscillator inhibited
VSC
0: VLIN and HCOR adjustments enabled
01 X # # D4 # # # #
1: VLIN and HCOR adjustments forced to centre value
MOD
0: horizontal and vertical moire cancellation enabled
01 X # D5 # # # # #
1: horizontal and vertical moire cancellation disabled
FHMULT 0: EW output independent of horizontal frequency
0B # # # # # # X D0
1: EW output tracks with horizontal frequency
VOVSCN 0: vertical size 100%
0B # # # # # D2 X #
1: vertical size 116.8% for VGA350
CLAMP 0: trailing edge for horizontal clamp
0B # # # # D3 # X #
1: leading edge for horizontal clamp
VBLK
0: vertical blanking = 260 µs
1: vertical blanking = 340 µs
0B # # # D4 # # X #
VLC
0: VLINBAL adjustment enabled
0B # # D5 # # # X #
1: VLINBAL adjustment forced to centre value
VPC
0: VPOS and HTRAP adjustments enabled
0B # D6 # # # # X #
1: VPOS and HTRAP adjustments forced to centre value
ACD
0: ASCOR disconnected from PLL2
0B D7 # # # # # X #
1: ASCOR internally connected with PLL2
STDBY⁽³⁾ 0: internal power supply enabled
0D X X X X X X # D0
1: internal power supply disabled
SOFTST⁽³⁾ 0: soft start not released (pin HPLL2 pulled to ground)
0D X X X X X X D1 #
1: soft start is released (power-up via pin HPLL2)
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.
2000 Jan 31
32