STV9211 datasheet(20/37 Pages) STMICROELECTRONICS

20 / 37 page

Functional description

STV9211

20/37

2.19

Specific application conditions

Functioning with VCCP below 8 V

To simplify the application, it is possible to supply the power VCCP with 5 V (instead of 8 V nominal)

at the expense of output swing voltage.The CRT Heater voltage (6.2V Typ.) is used very often to

supply VCCP..

Functioning without blanking pulse

If no blanking pulse is applied to the STV9211, it is necessary to ensure the OCL pulse generation

(which sets the infra-black level) by setting the Register 8, bit7=1 (OCL = BPCP).

To ensure the device correct behavior in the worst possible conditions, the brightness Register must

be set to 0.

Soft blanking

It is possible to blank the video signal by setting the Register 9, bit1=1 and Register 8, bit 6=1.

In this mode the output voltage is set to Vib (see

Figure 14). This mode is used for example when

changing the timing resolution of the video, in order to suppress the video during this transient

period.

Figure 14: Soft blanking

Feature

Soft Blanking

Channel

3 channels

simultaneously

name & address

Case #1: Normal operation

Case #2: Soft Blanking mode

(*) Register 8, bit6 must be set to 1 too

Black level

Infra-black

STV9211 Datasheet(PDF) 20 Page - STMicroelectronics