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13 Circuit Descriptions
13 Circuit Descriptions
13-1 Overall Block Structure
13-1-1 Power Tree |
1.When the AD board is in DPMS state:
1.1The IP has been designed so that it operates with a power consumption of less than 0.6W of.
1.2The Scaler consumes power up to 37mA
1.3The power to the panel is switched off
2.When the AD board is operating normally:
2.1The maximum power consumption of the panel lamps is described below (It may vary depending on the panel manufacturer)
4 x (7.5mA x 720mVrms)=4 x 5.4=21.6W
2.2The power consumption of the Panel Control board is as follows: 5V x 720mA=3.6W
2.3The power consumption of the Scaler is as follows: 3.3V x 245mA + 1.8V x 300mA = 1.35W
13-1
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 (SE567MRHLF).
3.Power MosFET: The IP board receives 5V and outputs a lower voltage in DPMS mode and supplies 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 digital TMDS and analog R,G,B signals and convert them to proper resolutions using upor downscaling that are transferred to the panel in the LDVS formats.
5.Crystal(Oscillator): Use one 14.318MHz oscillator externally to supply power to both MCU and Scaler at the same time.
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, FLASH and Scaler (SE567MRHLF) use the SDR direct bus for mutual communications, which is an effective, speedy system because it allows 4 additional address/data lines compared 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 Scaler and then converted to a digital value by the A/D converter of the chip. The digital value (data) is a clue to which key is entered. In practical, the voltage levels are set as below.
13-2
13 Circuit Descriptions
13-1-3 IP BOARD BLOCK(POWER) Parts
13-1-4 IP BOARD BLOCK( INVERTER ) Parts |
13-3 |
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