YGV639 Datasheet, PDF (10/34 Pages) YAMAHA CORPORATION – Video Controller 1 with Enhanced Functions

YGV639
■ Description of Pin Function
Power Supply
Digital Power Supply Pins
VDD33, VDDIN, VSS (Power Supply)
The power supply pins for the internal digital circuit. Supply 3.3V to VDD33 and VDDIN pins. Supply the
ground level to VSS pins.
It is recommended to decouple VDD33 and VDDIN with respect to the ground through a high-frequency
ceramic capacitor. The decoupling capacitor should be positioned between VDD33 and VSS, VDDIN and
VSS as close to the device as possible so that the wiring length becomes the shortest.
Power Supply Pin for PLL
PLLVDD (Power Supply)
This is the analog power supply pin for VCO of the built-in PLL. Connect VOUT18 pin to PLLVDD pin.
Connect a decoupling capacitor between this PLLVDD and the VSS (Pin 43).
Power Supply Pins for Analog Front End
AVDD1, AVDD2, AVSS (Power Supply)
This is the analog power supply pin for the built-in Analog Front End. Supply 3.3V to AVDD1 and
AVDD2 pins. Supply the ground level to AVSS pins. These power supplies should be separated from the
other power supplies. It is recommended that this pin should be decoupled by a high-frequency ceramic
capacitor to the analog ground. A decoupling capacitor should be positioned between AVDD1 (pin 37) and
AVSS (pin 34), AVDD2 (pin 38) and AVSS (pin 42) as close to the device as possible so that the wiring
length becomes shortest.
Inside the LSI, AVDD1 is connected to an AD converter and AVDD2 is connected to a clamping circuit or
a reference voltage circuit. AVDD1 generates about 27 MHz switching noise. Therefore, it is recommended
to take measures, such as insertion of different ferrite beads to AVDD1 and AVDD2, so that noise may not
input to AVDD2 through AVDD1.
Power Supply Pin for CPU Interface
VDD5 (Power Supply)
This is the power supply pin for the level shifter of CPU interface. It is possible to input 3.3V to 5V
according to CPU interface voltage. Connect a decoupling capacitor between this pin (VDD5) and VSS pin.
System Reset
Reset Pin
RESET_N (Schmitt Trigger Input)
This is the power-on reset input pin. The reset signal must be input for a given time after power on. This
pin is low active. The pin uses a schmitt trigger type buffer
10