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TDA4688 Folha de dados(PDF) 8 Page - NXP Semiconductors |
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TDA4688 Folha de dados(HTML) 8 Page - NXP Semiconductors |
8 / 24 page 1997 Jun 23 8 Philips Semiconductors Product specification Video processor with automatic cut-off control TDA4688 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 subaddresses (see Fig.5). All subaddresses from 00H to 0FH are automatically incremented, the subaddress counter wraps round from 0FH to 00H. Reserved subaddresses 07H, 08H, 09H, 0BH and 0FH are treated as legal but have no effect. Subaddresses outside the range 00H and 0FH are not acknowledged by the device. Subaddresses are stored in the TDA4688 to address the following parameters and functions (see Table 1): • Brightness adjust • Saturation adjust • Contrast adjust • Hue control voltage • RGB gain adjust • 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 NMEN (NTSC Matrix Enable): 0 = PAL/SECAM matrix 1 = NTSC matrix. 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 receiver does not accept any new data until this data is transferred into the data registers. 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 2). 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. CONTROL REGISTER 3 MOD2 (output clamp MODe2): 0 = inactive 1 = output clamping, but brightness inactive. When MOD2 = 1 and BCOF = 1 output clamp is enabled and brightness adjust is disabled (for clamping purposes of following RGB receivers). (BCOF = 0) AND (MOD2 = 1); from the description given above the influence on the clamping stage is contradictory. Consequently, there is no purpose to this combination and it makes no sense to switch this combination. When the supply voltage has dropped below approximately 6.0 V (usually occurs when the TV receiver is switched on or the supply voltage is interrupted) all data and function bits are set to 01H. |
Nº de peça semelhante - TDA4688 |
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Descrição semelhante - TDA4688 |
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