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STV9212 Datasheet(PDF) 16 Page - STMicroelectronics |
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STV9212 Datasheet(HTML) 16 Page - STMicroelectronics |
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16 / 34 page  Functional Description STV9212 16/34 2.9.2 Cut-off and Brightness Control Outputs Outputs CO1, CO2 and CO3 provide a DC voltage controlled via bits BRIG[7:0], IBLx[7:0], IBLRG[7:0], BRIGRG[1:0] and MOD[7:0]. The principal of operation is shown in Figure 14. When bit MOD is in position AC (= 1), the output voltage is a sum of the “brightness” VbriAC, “cut-off” ViblAC and a fixed VCOmin providing a bottom limitation. The brightness adjustment is equally applied to all three CO1, CO2 and CO3 outputs. It varies depending on bits BRIG[7:0] and BRIGRG[1:0], with bits BRIGRG[1:0] controlling the range of BRIG adjustment. The cut-off adjustment is separate for each channel, having one I²C-bus field per channel: IBL1, IBL2 and IBL3. The ratio between the brightness and cut-off ranges depends on the brightness range selection. See Figure 16. When bit MOD is in position DC (= 0), the output voltage on CO3 output is a sum of the “brightness” VbriDC and a fixed VCOmin providing a pedestal. Outputs CO1 and CO2 are floating with internal Figure 15: Output Infra-black Level Figure 16: CO1, CO2 and CO3 Outputs while MOD = 1 OUT1 22 18 20 OUT2 OUT3 19 black infra-black Vib(1) Vib(2) Vib(3) Vibmin Vibmin Vibmin Vibof Vibof Vibof Vibl(1) Vibl(2) Vibl(3) DC: differential cut-off I²C: IBL1, IBL2, IBL3 DC: common cut-off/brightness AC: video amp. biasing I²C: IBOF fixed DC AC: Vibl(1,2,3) = 0V Channel 1 Channel 2 Channel 3 GNDP CO1 17 15 16 CO2 CO3 19 VCO(1) VCO(2) VCO(3) VCOmin VCOmin VCOmin VbriAC VbriAC VbriAC ViblAC(1) ViblAC(2) ViblAC(3) I²C: IBL1, IBL2, IBL3 brightness through cathods I²C: BRIG fixed DC cut-off Channel 1 Channel 2 Channel 3 GNDP |
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