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STV2000 数据表(PDF) 28 Page - STMicroelectronics

部件名 STV2000
功能描述  I2C SINGLE FREQUENCY DEFLECTION PROCESSOR AND 70 MHz RGB PREAMPLIFIER
PDF  38 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

STV2000 数据表(HTML) 28 Page - STMicroelectronics

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OPERATING DESCRIPTION (continued)
1.7 Cutoff DAC Output
Three Cutoff DACs (8 bits) with output buffers are
incorporated to drive the external cutoff circuit.
Output voltage range is from 0.5 V to 4.5 V.
1.8 Blanking Generator
A vertical blanking pulse is generated
(see Figure 20). The output level is a positive go-
ing pulse of 8V. The vertical blanking is started by
the vertical sync pulse and the duration is deter-
mined by counting 22 horizontal periods. If there is
no vertical sync pulse the vertical blanking start
coincides with the beginning of the vertical capac-
itor discharge time.
The blanking output generates a superimposed
variable DC voltage. The 6-bit adjustment range is
1 V to 4.5 V. This is used to allow brightness con-
trol through G1. Additionally, this pin is used for
spot killer suppression. The 0.8 V of Vcc threshold
will trigger the output into a high level state result-
ing from the Vcc decay.
Figure 20. VBDC (Pin 24) Output Voltage Waveform
1.9 DAC Output
This is a 7-bit DAC with 1 output pin. An output
buffer is used to enhance load capability with an
Imax(source) of 2 mA.
Table 1:
Logic Table
Note 1 NA= Not applicable.
Note 2 I2C video=on will be reset by I2CDPMS/Low Vcc.
22 H lines
DC level controlled by
8V
6-bit DAC
4.5 V
1.0 V
Conditio ns
Hout
Vout
Video-off
Low Power
Vcc at 0 to 6.9 V (PD2 mode)
no
no
video-off
NA (1)
Vcc at 6.9 V to 8.5 V (PD1 mode)
yes
yes
video-off
NA(1)
I2C DPMS bit=1, (default=0)
no
no
video-off
yes
Hlock/unlock detection = unlock
yes
yes
video-off
no
Video ABL input pin < 1 V
no
no
video-off
no
5V POR orI2C POR=1, (default=0)
yes
yes
video-off
no
I2C Hout on/off, (default=1=on)
on/off
yes
on/off
no
I2C Vout on/off, (default=1=on)
yes
on/off
on/off
no
I2C Video on/off, (default=0=video-off)
yes
yes
on/off
no
Vcc at >8.5 V
yes
yes
video-on (2)
NA (1)
Vcc at >8.5 V, I
2C video=1=on
yes
yes
video-on (2)
no
6



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