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TDA4886A Datasheet(PDF) 9 Page - NXP Semiconductors

Part No. TDA4886A
Description  140 MHz video controller with I2C-bus
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
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 9 page
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1998 Dec 04
9
Philips Semiconductors
Product speciļ¬cation
140 MHz video controller with I2C-bus
TDA4886A
7.9
I2C-bus control
The TDA4886A contains an I2C-bus receiver for several
control functions:
1. Contrast control with 6-bit DAC
2. Brightness control with 6-bit DAC
3. OSD contrast control with 4-bit DAC
4. Gain control for each channel with 6-bit DAC
5. Internal feedback reference and external reference
voltage control for each channel with 8-bit DAC
6. Control register with control bits BLH2, BLH1, FPOL,
DISV, DISO and PEDST.
After power-up and after internal power-on reset of the
I2C-bus the registers are set to the following values:
ā€¢ Control bit FPOL to logic 1
ā€¢ Control bits BLH2, BLH1, DISV, DISO and PEDST to
logic 0
ā€¢ All other alignment registers to logic 0 (minimum value
for control registers).
7.10
I2C-bus data buffer
1. Buffered mode
Adjustments via the I2C-bus are synchronized with
vertical blanking pulse at CLI.
a) Most significant bit (MSB) of subaddresses is set to
logic 1.
b) Only one I2C-bus transmission in buffered mode is
accepted before the start of the vertical blanking
pulse. Following transmission trials will get no
acknowledge.
c) Received data is stored in one internal 8-bit buffer.
d) Adjustments will take effect with detection of the
first vertical blanking pulse after the end of
according I2C-bus transmission.
e) Waiting for vertical blanking pulse in buffered mode
can be interrupted by power-on reset.
f) Auto-increment is impossible.
g) Buffered mode should be used for user
adjustments such as contrast, OSD contrast and
brightness while picture on monitor is visible.
2. Direct mode
Adjustments via the I2C-bus take effect immediately.
a) Most significant bit (MSB) of subaddresses is set to
logic 0.
b) Number of I2C-bus transmissions in direct mode is
unlimited.
c) Adjustments take effect directly at the end of each
I2C-bus transmission.
d) Direct mode can be used for all adjustments but
large changes of control values may appear as
visual disturbances in the picture on the monitor.
e) Auto-increment is possible.
f) Vertical blanking pulse is not necessary.




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