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LC74776 Datasheet(PDF) 3 Page - Sanyo Semicon Device |
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LC74776 Datasheet(HTML) 3 Page - Sanyo Semicon Device |
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3 / 35 page  Pin Functions No. 6018-3/35 LC74776, 74776M Pin no. Pin Function Notes 1 VSS1 Ground Ground connection (digital system ground) 2 XtalIN These pins are used either to connect the crystal and capacitors used to form an external crystal oscillator circuit to generate the internal synchronizing signals, or to input an external XtalOUT Crystal oscillator clock signal (2fsc or 4fsc). As a mask option, the XtalOUT pin can be set to function as 3 (MUTE) (MUTE input) the MUTE input pin. When this pin is set low, the video output is held at the pedestal level. (A pull-up resistor is built in and the input has hysteresis characteristics.) Switches the mode between external clock input and crystal oscillator operation. A low level 4 CTRL1 selects crystal oscillator operation and a high level selects external clock input. As a mask (CHABLK) option, the CTRL1 input pin can be set to function as the CHABLK (character . frame) output. This is a 3-value output. 5 SCL I2C clock input Clock input for the PDC/VPS data output. I2C bus. 6 OSCIN LC oscillator Connection for the external coil and capacitor for the oscillator used to generate connections the character output dot clock 7 OSCOUT Outputs the state of the external synchronizing signal presence/absence judgment. Outputs External synchronizing a high level when synchronizing signals are present. 8 SYNCJDC signal judgment output Outputs either the crystal oscillator clock if CS and RST are low, or the VCO clock if CS and RST are high. (This signal is not output after a command reset.) Enable input for the OSD serial data input. 9 CS Enable input Serial data input is enabled when this pin is low. A pull-up resistor is built in and the input has hysteresis characteristics. 10 SCLK Clock input Serial data input enable pin. A pull-up resistor is built in and the input has hysteresis characteristics. 11 SIN Data input Serial data input. A pull-up resistor is built in and the input has hysteresis characteristics. 12 VDD2 Power supply Composite video signal level adjustment power supply (analog system power supply) 13 CPOUT Charge pump output Charge pump output. Connect a low-pass filter to this pin. 14 VCOIN Oscillator control voltage input VCO oscillator control voltage input. (For data slicing) 15 VSS3 Ground Ground (VCO ground) 16 VCOR Oscillator range adjustment VCO oscillator range adjustment resistor connection 17 NC This pin must either be connected to ground or left open 18 VDD3 Power supply (+5 V) Power supply (+5 V: VCO power supply) 19 CVOUT Video signal output Composite video signal output 20 VSS2 Ground Ground (analog system ground) 21 CVIN Video signal input Composite video signal input 22 CVCR Video signal input SECAM chrominance signal input 23 VDD1 Power supply (+5 V) Power supply (+5 V: digital system power supply) 24 SYNIN Sync separator circuit input Video signal input to the internal sync separator circuit 25 SEPC Slice level output Slice level verification pin 26 SEPOUT Composite synchronizing Internal sync separator circuit composite synchronizing signal output. The signal actually signal output output can be switched by MOD0 and SEL0. The DAV signal is output in the initial state. PDC/VPS data I/O. 27 SDA I2C bus data I/O The I2C bus write address is [0111 1100]. The I2C bus read address is [0111 1101]. 28 CDLR Background color phase Background color phase adjustment resistor connection adjustment 29 RST Reset input System reset input. A pull-up resistor is built in and the input has hysteresis characteristics. 30 VDD1 Power supply (+5 V) Power supply (+5 V: digital system power supply) Note: *Both VDD1 pins must be connected to power. Crystal oscillator input switching (CHABLK) |
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