MP4680 datasheet(8/28 Pages) PHILIPS

8 / 28 page

1996 Oct 25

Philips Semiconductors

Product speciﬁcation

Video processor with automatic cut-off

and white level control

TDA4680

AUTO-INCREMENT

The auto-increment format enables quick slave receiver

initialization by one transmission, when the I2C-bus control

bit BREN = 0 (see control register bits of Table 1).

If BREN = 1 auto-increment is not possible.

If the auto-increment format is selected, the MAD byte is

followed by a SAD byte and by the data bytes of

consecutive sub-addresses (Fig.6).

All sub-addresses from 00H to 0FH are automatically

incremented, the sub-address counter wraps round from

0FH to 00H. Reserved sub-addresses 0BH, 0EH and 0FH

are treated as legal but have no effect. Sub-addresses

outside the range 00H and 0FH are not acknowledged by

the device and neither auto-increment nor any other

internal operation takes place (for versions V1 to V5

sub-addresses outside the range 00H and 0FH are

acknowledged but neither auto-increment nor any other

internal operation takes place).

Sub-addresses are stored in the TDA4680 to address the

following parameters and functions (see Table 1):

• Brightness adjust

• Saturation adjust

• Contrast adjust

• Hue control voltage

• RGB gain adjust

• RGB reference voltage levels

• Peak drive limiting adjust

• Control register functions.

The data bytes D7 to D0 (see Table 1) provide the data of

the parameters and functions for video processing.

CONTROL REGISTER 1

VBWx (Vertical Blanking Window):

x = 0, 1 or 2. VBWx selects the vertical blanking interval

and positions the measurement lines for cut-off and

white level control.

The actual lines in the vertical blanking interval after the

start of the vertical pulses selected as measurement lines

for cut-off and white level control are shown in Table 2.

The standards marked with (*) are for progressive line

scan at double line frequency (2fL), i.e. approximately

31 kHz.

NMEN (NTSC Matrix Enable):

0 = PAL/SECAM matrix

1 = NTSC matrix.

WPEN (White Pulse Enable):

0 = white measuring pulse disabled

1 = white measuring pulse enabled.

BREN (Buffer Register Enable):

0 = new data is executed as soon as it is received

1 = data is stored in buffer registers and is transferred to

the data registers during the next vertical blanking

interval.

The I2C-bus transceiver does not accept any new data

until this data is transferred into the data registers.

DELOF (Delay Off) delays the leading edge of clamping

pulses:

0 = delay enabled

1 = delay disabled.

SC5 (SandCastle 5 V):

0 = 3-level sandcastle pulse

1 = 2-level (5 V) sandcastle pulse.

CONTROL REGISTER 2

FSON2 (Fast Switch 2 ON)

FSDIS2 (Fast Switch 2 Disable)

FSON1 (Fast Switch 1 ON)

FSDIS1 (Fast Switch 1 Disable)

The RGB input signals are selected by FSON2 and

FSON1 or FSW2 and FSW1:

• FSON2 has priority over FSON1

• FSW2 has priority over FSW1

• FSDIS1 and FSDIS2 disable FSW1 and FSW2

(see Table 3).

BCOF (Black level Control Off):

0 = automatic cut-off control enabled

1 = automatic cut-off control disabled; RGB outputs are

clamped to fixed DC levels.

FSBL (Full Screen Black Level):

0 = normal mode

1 = full screen black level (cut-off measurement level

during full field).

FSWL (Full Screen White Level):

0 = normal mode

1 = full screen white level (white measurement level

during full field).

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