STV2000 datasheet(29/38 Pages) STMICROELECTRONICS

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STV2000

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OPERATING DESCRIPTION (continued)

C STAND-BY MODE AND PROTECTIONS

1. GENERAL CONSIDERATIONS

1.1 POR (Power On Reset) - Subadress 11- D8

POR is activated on 5 V with default values for

each adjustment and in addition video off (see

1.3). It can be activated via the I2C command.

1.2 Supply Voltage Threshold.

Two built-in thresholds (see figure 21) are used to

enter the following modes:

•

PDI mode:

– Activated for Vcc < 8.5V

– Video off (see 1.13)

•

PD2 mode:

– Activated for Vcc < 6.9V

– Video off (see 1.13)

–HOUT and VOUT disabled

1.3 Video Off (I2C control) - Subadress 00 - D8

Activates blanking of the 3 video output stages.

During this time the outputs are switched to

ground level, regardless of the presence of Hsync

or Hflyback. Activation time is inferior to 1

µs.

This also activates the blanking output generating

a positive going signal at pin 24 as long as “video

off” is activated.

1.4 Vertical Output Off

This command will switch off output VAMP. The

vertical output swing is reduced to 0V.

During power saver mode, the total vertical section

is disabled.

1.5 Power Saver On - Subadress 11 - D7

This I2C command activates the PD1 and PD2

mode regardless of the scanning Vcc value. Inter-

nal scanning and pre-amp voltage are off. During

“power saver” mode, the device power consump-

tion will be reduced to below 20mA for all supply

pins. Vdd, I2C interface and DAC data are not af-

fected by this command.

1.6 X-Ray, Set Operation - Subadress 09 - D8

When ABL voltage is below 1 V threshold, Xray

latch will be activated. This I2C command will reset

the Xray latch. Activation time below 100ms.

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