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TDA4886 Scheda tecnica(PDF) 9 Page - NXP Semiconductors |
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TDA4886 Scheda tecnica(HTML) 9 Page - NXP Semiconductors |
9 / 52 page 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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