For Information Equipment MN8390-C LCD Panel Source Driver Overview The MN8390-C is for displaying an analog video signal on a TFT color liquid crystal display panel in such applications as LCD television sets and video cameras. Features Lower power consumption and reduced EMI emissions owing to digital 3.0 volt power supply and analog 5.0 volt power supply Broad dynamic range of 4.6 V (for power supply voltage of 5.0 V) Low discrepancies between output pins: ±20 mV (typ.) 240 output channels Support for striped and delta panel layouts by switching analog (R, G, B) signals Support for sequential sampling mode (with CLK1 to CLK3 inputs) Support for serial cascade connections Automatic clock suspension after reading specified amount of data Choice of shift register shift directions (right/left) Applications LCD television sets and video cameras MN8390-C For Information Equipment QC80 QB80 QA80 QC1 QB1 QA1 Block Diagram VDD2 VSS2 VBS Bias control circuit Output buffer OE 240 VA,VB, VC 3 D1 Analog multiplexer 3 Two sample-and-hold circuits VDD1 VSS1 240 CLK1, CLK2, CLK3 3 Clock generator circuit Bidirectional 240-bit shift register MOD RL STHR TEST1 TEST2 Shift register control circuit STHL For Information Equipment MN8390-C Pin Descriptions Pin No. 99 to 102 Symbol STHR 21 to 24 STHL Pin Name Shift data I/O I/O I/O Function Description These are I/O pins for the bidirectional shift register. The RL pin controls their I/O directions. RL H L 27 to 30 RL Shift direction I control STHR Input Output STHL Output Input (1) Input The pins provide input data to the shift register's first stage. The shift register reads in this data at the rising edge of the CLK1 signal. (2) Output In a cascade connection, the pins provide the data for the synchronizing output stage synchronized with the rising edge of the CLK1 signal. This pin controls the shift direction for the bidirectional shift register. RL="H" : QA1→ QB1→ QC1→ → QC80 RL="L" : QC80→ QB80→ QA80→ → QA1 42 to 45 CLK1 to 3 Clock input I 37 to 40 These pins provide the shift clock signals that the sample-and-hold circuits use to generate the data for 32 to 35 the LCD drive output pins (QA1-QC80). The following lists the relationships between these clock signals and the output pins. CLK1 RL="H": RL="L": CLK2: 70 to 73 OE Output enable I QA1 to QA80 QC1 to QC80 QB1 to QB80 CLK3 RL="H": QC1 to QC80 RL="L": QA1 to QA80 At each rising edge of this signal, the MN8390-C switches between its two sample-and-hold circuits and initiates output of new data. When the outputs reach the drive potential, the MN8390-C automatically reduces the drive power, but maintains the outputs at the drive potential. 47 to 50 D1 Analog signal swiching I This pin controls the mapping between the three analog inputs (VA, VB, and VC) and the drive outputs (QA, QB, and QC). D1 L H Input VA VB VC VA VB VC Output QA1 to QA80 QB1 to QB80 QC1 to QC80 QB1 to QB80 QC1 to QC80 QA1 to QA80 MN8390-C For Information Equipment Pin Descriptions Pin No. Symbol Pin Name I/O 93 to 97 VBS Bias adjustment I Function Description The voltage applied to this pin adjusts the output buffer bias and thus the drive capacity of the LCD drive outputs. 87 to 91 VA Analog signal 81 to 85 VB input 75 to 79 VC 147, 149 QA1 to 80 LCD drive 151 to 385 QB1 to 80 output 387, 389 QC1 to 80 I These pins accept the analog signal inputs for routing to the LCD drive outputs. O These pins yield the levels obtained by applying the sample-and-hold circuits to the analog inputs (VA, VB, and VC). 391 52 MOD 62 TEST1 Mode selection I signal input Test input Connect this pin to VSS1 for sequential sampling mode. I Connect this pin to VDD1. 61 TEST2 Test input I 63 to 68 VDD1 Power supply for — These pins supply the driving potential for the logic 9 to 18 VDD2 Power supply for — These pins supply the driving potential for the — These pins supply the ground potential for the logic — These pins supply the ground potential for the digital circuits 105 to 114 and other digital circuits. analog circuits 53 to 58 V SS1 127 to 142 V SS2 Ground for sample-and-hold and other analog circuits. digital circuits 396 to 409 Ground for analog circuits Connect this pin to VDD1. and other digital circuits. sample-and-hold and other analog circuits.