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LM1276 データシート(PDF) 8 Page - Texas Instruments |
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LM1276 データシート(HTML) 8 Page - Texas Instruments |
8 / 56 page OBSOLETE LM1276 SNOSAB9B – MAY 2005 – REVISED APRIL 2013 www.ti.com Hexadecimal and Binary Notation Hexadecimal numbers appear frequently throughout this document, representing slave and register addresses, and register values. These appear in the format “0x...”. For example, the slave address for writing the registers of the LM1276 is hexadecimal BA, written as 0xBA. On the other hand, binary values, where the individual bit values are shown, are indicated by a trailing “b”. For example, 0xBA is equal to 10111010b. A subset of bits within a register is referred to by the bit numbers in brackets following the register value. For example, the OSD contrast bits are the fourth, fifth, and sixth bits of register 0x8538. Since the first bit is bit 0, the OSD contrast register is 0x8538[5:3]. Register Test Settings Table 1 shows the definitions of the Test Settings 1–8 referred to in the specifications sections. Each test setting is a combination of five hexadecimal register values, Contrast, Gain (Blue, Red, Green) and DC offset. Table 1. Test Settings Test Settings Control No. of Bits 1 2 3 4 5 6 7 8 Contrast 7 0x7F (Max) 0x00 0x7F 0x7F 0x40 0x7F 0x7F 0x7F Min (Max) (Max) (50.4%) (Max) (Max) (Max) B, R, G 7 0x7F 0x7F 0x7F Set VO to 2 0x7F 0x40 0x00 0x7F (Max) Gain (Max) (Max) (Max) VP-P (Max) (50.4%) (Min) DC Offset 3 0x00 (Min) 0x05 0x07 0x05 0x05 0x05 0x05 0x05 (Max) OSD VS Video Intensity The OSD amplitude has been increased over the LM1237 level. During monitor alignment the three gain registers are used to achieve the desired front of screen color balance. This also causes the OSD channels to be adjusted accordingly, since these are inserted into the video channels prior to the gain attenuators. This provides the means to fine-tune the intensity of the OSD relative to the video as follows. If a typical starting point for the alignment is to have the gains at maximum (0x7F) and the contrast at 0x55, the resultant OSD intensity will be higher than if the starting point is with the gains at 0x55 and the contrast at maximum (0x7F). This tradeoff allows the fine-tuning of the final OSD intensity relative to the video. In addition, the OSD contrast register, 0x85C8[5:3], provides 8 major increments of intensity. Together, these allow setting the OSD intensity to the most pleasing level. ESD Protection The LM1276 features a 3.0 kV ESD protection level (see (1) and (2)). This is provided by special internal circuitry, which activates when the voltage at any pin goes beyond the supply rails by a preset amount. This protection is applied to all the pins, including SDA and SCL. (1) Human body model, 100 pF discharged through a 1.5 k Ω resistor. (2) Machine Model ESD test is covered by specification EIAJ IC-121-1981. A 200 pF cap is charged to the specific voltage, then discharged directly into the IC with no external series resistor (resistance of discharge path must be under 50 Ω). 8 Submit Documentation Feedback Copyright © 2005–2013, Texas Instruments Incorporated Product Folder Links: LM1276 |
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