CXA2000 datasheet(33/48 Pages) SONY

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CXA2000Q

Description of Operation

1. Power-on sequence

The CXA2000Q does not have an internal power-on sequence. Therefore, power-on sequence is all controlled

by the set microcomputer (I2C bus controller).

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, but Vdrive is DC output. Bus registers which are set by power-on reset are as follows.

AGING

= 0: All white output aging mode OFF

RON

= 0: Rch video blanking ON

GON

= 0: Gch video blanking ON

BON

= 0: Bch video blanking ON

PICON

= 0: RGB all blanking ON

VOFF

= 1: VDRIVE output stopped mode

VFREQ

= 0: Automatic identification mode (identification starts at 50Hz)

FHHI

= 1: H oscillator maximum frequency mode

HSIZESW

= 0: Normal

CD-MODE = 0: Automatic selection mode of the countdown mode

AKBOFF

= 0: AKB mode

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.

Set sequence

CXA2000Q register settings

Power-on

Reset status in 1) above.

↓↓

Degauss

Reset status in 1) above.

The CRT is degaussed in the completely darkened condition.

↓↓

VDRIVE oscillation

The IC is set to the power-on initial settings. (See the following page.)

A sawtooth wave is output to VDRIVE and the IC waits for the vertical

deflection to stabilize. The HDRIVE oscillator frequency goes to the standard

frequency.

↓↓

AKB operation start

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.

↓↓

AKB loop stable

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.

↓↓

Video output

RON, GON and BON are set to 1 and the video signal is output from Rout,

Gout and Bout.

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