STV9212 datasheet(18/34 Pages) STMICROELECTRONICS

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Functional Description

STV9212

18/34

2.10

Signal Waveforms

Figure 18 gives a summary of main signals waveforms.

2.11

Miscellaneous

2.11.1 Stand-by Mode

The device is set in Stand-by mode either by means of bit

PASTBY or by lowering the VCCP supply

voltage below the VCCPS threshold. Once in Stand-by mode, the device does not process the video

signal and its power consumption is significantly reduced. The I²C-bus interface remains

operational. A low level is forced on the AMPCTL output. Refer to Section 4: Electrical

Specifications for values.

2.11.2 AMPCTL Output

The AMPCTL is designed to control a video power amplifier. It provides a three-level logical signal

that depends on bits

ASTBY and ABLEN, as well as on the operating mode (stand-by / normal) of

the device. Figure 19 gives all possible states of the AMPCTL output. Refer to Section 4: Electrical

Specifications for electrical parameter values. Pin AMPCTL is of push-pull type. It must not directly

Figure 18: Signal Waveforms

ICP

BLKI

Video input

FBLK

OSD input

Video output

Black-level

Infra-black

OCP

level

IN1 (2,3)

OSD1 (2,3)

OUT1 (2,3)

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