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13 Circuit Descriptions
13-1-2 Main board Parts
1. Inverter: A conversion device that converts DC
rated voltage/current to high ones necessary for
the panel lamp.
2. DC/DC(Regulator): General term for DC to DC
converting devices.
The IP board receives 5V and outputs 1.8 or
3.3V that is supplied to the scaler
(TSUM16AL-LF).
3. Power MosFET: The IP board receives 5V and
outputs a lower voltage in DPMS mode and sup-
plies the whole 5V for the panel operating board in
normal conditions. In that case, the switching of
Power MosFET is controlled by Micom.
4. Scaler: Receives the analog R,G,B signals and
convert them to proper reso- lutions using up- or
down- scaling that are transferred to the panel in
the LDVS formats.
5. Crystal(Oscillator): Use one 14.318MHz oscilla-
tor externally to supply power to both MCU and
Scaler at the same time.
13-2
6. Scaler & EEPROM: I2C is a two-way serial bus
of two lines that supports communications across
the integrated circuits as well as between FLASH
and EEPROM.
In particular, MCU(TSUM16AL-LF) and use the
SDR direct bus for mutual communications, which
is an effective, speedy system because it allows 4
additional address/data lines com- pared to the old
serial systems.
7. Function Key: A certain keystroke generates a
certain electrical potential, which is transferred into
ADC input port of the MCU and then con- verted to
a digital value by the A/D converter of the chip. The
digital value (data) is a clue to which key is
entered.
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