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TDA9955HL Datasheet(PDF) 10 Page - NXP Semiconductors |
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TDA9955HL Datasheet(HTML) 10 Page - NXP Semiconductors |
10 / 52 page TDA9955HL_1 © NXP B.V. 2008. All rights reserved. Product data sheet Rev. 01 — 17 March 2008 10 of 52 NXP Semiconductors TDA9955HL Triple 8-bit analog-to-digital video converter for HDTV 8.13 Video port selection Each channel (R or G or B in RGB 4 :4:4 mode, Y or CB or CR in YUV 4 : 4 : 4 mode, Yor CBCR in 4 : 2 : 2 semi-planar mode, CBYCRY in 4:2:2 ITU-R BT.656 mode) can be affected to a specified video port VPA, VPB or VPC via the I2C-bus. 8.14 Output buffers The levels of the output buffers are LV-TTL compatible. The switch of the outputs between active and high-impedance is set by the I2C-bus. 8.15 VHREF timing generator The VHREF timing generator outputs all the timing signals used by the device: gain and clamp pulses for calibration, coast signal to manage the PLL, VREF, HREF and FREF signals for SAV/EAV and other, VS and HS signals to change width and position compared with the synchronization inputs. 8.16 I2C-bus serial interface The I2C-bus serial interface allows to program the internal registers of the device. The slave address of the device is selected by pin A0. The programmed values in the registers remain valid. 8.17 Power management Only the serial interface (and the I2C-bus registers) and the activity detection are powered up in all cases even in the case when the device is set to power-down with the PD-registers. 8.18 Sync timing measurement To assist the recognition of the input format, the vertical and horizontal periods are measured based on the externally provided MCLK frequency (13.5 MHz). The width of the horizontal pulse is also measured. 9. I2C-bus interface 9.1 I2C-bus protocol The TDA9955HL is a slave I2C-bus device and the SCL pin is only an input pin. The timing and protocol for I2C-bus are standard. Bit A0 of the I2C-bus device address is externally selected by the A0 pin. The main device I2C-bus address is given in Table 3. Table 3. I2C-bus slave address Device address R/W A6 A5 A4 A3 A2 A1 A0 - 100111A0 0/1 |
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