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TDA4886 Scheda tecnica(PDF) 9 Page - NXP Semiconductors

Il numero della parte TDA4886
Spiegazioni elettronici  140 MHz video controller with I2C-bus
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Produttore elettronici  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

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1998 Nov 11
9
Philips Semiconductors
Product specification
140 MHz video controller with I2C-bus
TDA4886
7.9
I2C-bus control
The TDA4886 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:
• Control bit FPOL to logic 1
• Control bits BLH2, BLH1, DISV, DISO and PEDST to
logic 0
• 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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