CXA2095 Sony Corporation, CXA2095 Datasheet - Page 26

• Manufacturer Part Number: CXA2095
• Description: Y/C/RGB/Sync/Deflection for Color TV
• Manufacturer: Sony Corporation

Description of Operation
1. Power-on sequence
The CXA2095S does not have an internal power-on sequence. Therefore, all IC operations are controlled by
the set microcomputer (I
1) Power-on
The IC is reset and the RGB outputs are all blanked. Hdrive starts to oscillate, but oscillation is at the
maximum frequency (16kHz or more) and is not synchronized to the input signal. Output of vertical signal
VTIM starts, VDRIVE outputs V sawtooth wave. Bus registers which are set by power-on reset are as follows.
2) Bus register data transfer
The register setting sequence differs according to the set sequence. Register settings for the following
sequence are shown as an example.
AGING1
AGING2
RON
GON
BON
PICON
VOFF
FHHI
CD-MODE = 0: Automatic selector mode of the countdown mode
AKBOFF
Set sequence
Power-on
Degauss
IC initial setting
AKB operation start
AKB loop stable
Video output
2
= 0: All white output aging mode OFF
= 0: All black output aging mode OFF
= 0: Rch video blanking ON
= 0: Gch video blanking ON
= 0: Bch video blanking ON
= 0: RGB all blanking ON
= 0: V sawtooth wave oscillation mode
= 1: H oscillator maximum frequency mode
= 0: AKB mode
C bus controller).
CXA2095S register settings
Reset status in 1) above.
Reset status in 1) above.
The CRT is degaussed in the completely darkened condition.
The IC is set to the power-on initial settings. (See the following page.)
The HDRIVE oscillator frequency goes to the standard frequency (around
15.734kHz).
PICON is set to 1 and a reference pulse is output from Rout, Gout and
Bout. Then, the IC waits for the cathode to warm up and the beam current
to start flowing.
Status register IKR is monitored.
IKR = 0: No cathode current
IKR = 1: Cathode current
Note that the time until IKR returns to 1 differs according to the initial
status of the cathode.
RON, GON and BON are set to 1 and the video signal is output from
Rout, Gout and Bout.
– 26 –
VOFF = 1 for the CXA2025S.
CXA2095S