THC7984 Datasheet, PDF (7/45 Pages) THine Electronics, Inc. – 10-bit 3-channel Video Signal Digitizer

THC7984_Rev.2.0_E
(4) Automatic Sync Processing Mode (Manual Setting Modes are also available)
- Auto Output Mode (All outputs are enabled when input signal is active)
- Input Port Auto Select (Selects the port whose input signal is active)
- Input Sync Type Auto Select (HSYNC Input, VSYNC Input)
- HSYNC, VSYNC Input Polarity Auto Select
- HSYNC, VSYNC Output Polarity Auto Select
- VSYNC Output Timing Auto Setting
- PLL COAST Timing Auto Setting
Power Control
- The THC7984 can be set to stand-by mode by a register or RST-pin.
- In stand-by mode, most of the analog circuits are powered down for low power dissipation.
- In stand-by mode, the sync detection and measurement are available nonetheless because SOG Slicer, Sync Processor,
and 2-wire serial interface are still power-on.
- The THC7984 is set to stand-by mode when RST-pin is set to High. If unused, RST-pin must be pull-down to ground
with a resistor.
Reset
- The logic circuit of the chip is reset when power is applied with RST-pin asserted Low (Power-on Reset) .
- The reset can be also triggered by RST-pin (Manual Reset) . The reset is triggered when RST-pin falls from High to
Low, that means the reset is triggered whenever the THC7984 gets out of stand-by mode by RST-pin.
- Reset after power-up is necessary to access the serial interface. Please power-up with RST-pin asserted Low or make
RST-pin High then Low after power-up. If unused, RST-pin must be pull-down to ground with a resistor.
- The registers are set to the default values by the reset and the chip becomes stand-by mode and output disable (Hi-Z) .
For normal operation, the registers must be set to power-on and output enable by the serial interface.
- For Manual Reset, keep RST-pin Low more than 20 us after the transition from High to Low.
RST (Reset Signal)
Min. 100ns
VIH
VIL
* Reset Timing
Min. 20us
Device Address
- The LSB of 7-bit device address of serial interface (A0) is obtained from VSOUT/A0-pin at the reset.
Pull-down to ground with a resistor (10 kΩ) , then Device Address is set to 1001100
Pull-up to VDD with a resistor (10 kΩ) , then Device Address is set to 1001101
- The pull-up resistor must be connected to VDD.
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THine Electronics, Inc.