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S1D2512X01-A0B0 Datasheet(PDF) 24 Page - Samsung semiconductor

Part # S1D2512X01-A0B0
Description  DEFLECTION PROCESSOR FOR MULTISYNC MONITORS
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Manufacturer  SAMSUNG [Samsung semiconductor]
Direct Link  http://www.samsung.com/Products/Semiconductor
Logo SAMSUNG - Samsung semiconductor

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S1D2512X01
DEFLECTION PROCESSOR FOR MULTISYNC MONITORS
23
Read Mode
During read mode the second byte transmits the reply information.
The reply byte contains horizontal and vertical lock/unlock status, the XRAY activated or not, the horizontal and
vertical polarity detection. It also contains the Synchro detection status which is used by the MCU to assign sync
priority.
A stop condition always stops all the activities of the bus decoder and switches to high impedance both the data
and the clock line (SDA and SCL) .
See I2C sub address and control tables.
Sync processor
The internal sync processor allows the S1D2512X01 to accept any kind of input Synchro signals:
Separated horizontal & vertical TTL-compatible sync signals,
Composite horizontal & vertical TTL-compatible sync signals.
Sync identification Status
The MCU can read (address read mode: 8D) the status register via the I2C bus, and then select the sync priority
depending on this status.
Among other data this register indicates the presence of sync pulses on H/HVIN, VSYNCIN and (when 12V is
supplied) whether a Vext has been extracted from H/HVIN. Both horizontal and vertical sync are detected even if
only 5V is supplied.
In order to choose the right sync priority the MCU may proceed as follows (see I2C address Table):
Refresh the status register,
Wait at least for 20ms(max. vertical period),
Read this status register,
Sync priority choice should be:
Of course, when choice is made, one can refresh the sync detections and verify that extracted Vsync is present
and that no sync change occurred.
The Sync processor is also giving sync polarity information.
IC status
The IC can inform the MCU about the 1st horizontal PLL and vertical section status(locked or not), and about the
XARY protection (activated or not). Resetting the XRAY internal latch can be done either by decreasing the Vcc or
VDD supply or directly resetting it via the I
2C interface.
Vext Det
H/V Det
V Det
Sync Priority Subaddress 03 (D8)
Comment Sync Type
No
Yes
Yes
1
Separated H & V
Yes
Yes
No
0
Composite TTL H & V


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