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S1D2512X01-A0B0 Datasheet(PDF) 23 Page - Samsung semiconductor |
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S1D2512X01-A0B0 Datasheet(HTML) 23 Page - Samsung semiconductor |
23 / 36 page ![]() DEFLECTION PROCESSOR FOR MULTISYNC MONITORS S1D2512X01 22 OPERATING DESCRIPTION GENERAL CONSIDERATIONS Power Supply The typical values of the power supply voltages Vcc and VDD are respectively 12V and 5V. Optimum operation is obtained if Vcc and VDD are maintained in the limits: 10.8 to 13.2V and 4.5 to 5.5V. In order to avoid erratic operation of the circuit during the transient phase of Vcc and VDD switching on, or switching off, the value of Vcc and VDD are monitored and the outputs of the circuit are inhibited if Vcc is less than 7.5V typically. In the same manner, VDD is monitored and internal set-up is made until VDD reaches 4V (see I 2C control table for power on reset). In order to have a very good power supply rejection, the circuit is internally supplied by several internal voltage references (the typical value is 8V). Two of these voltage references are externally accessible, one for the vertical part and one for the horizontal part. If needed, these voltage references can be used (until Iload is less than 5mA). Furthermore it is necessary to filter the voltage references by the use of external capacitor connected to ground, in order to minimize the noise and consequently the “jitter” on vertical and horizontal output signals. I2C Control S1D2512X01 belongs to the I2C controlled device family, instead of being controlled by DC voltage on dedicated control pins, each adjustment can be realized through the I2C interface. The I2C bus is a serial bus with a clock and a data input. The general function and the bus protocol are specified in the Phillips-bus data sheets. The interface (data and clock) is TTL-level compatible. The internal threshold levels of the input comparator are 2.2V on rising edge and 0.8V on falling edge (when VDD is 5V). Spikes of up to 50ns are filtered by an integrator and maximum clock speed is limited to 400kHz. The data line (SDA) can be used in a bidirectional way that means in read-mode the IC clocks out a reply information (1byte) to the micro-processor. The bus protocol prescribes always a full-byte transmission. The first byte after the start condition is used to transmit the IC-address (hexa 8C for write, 8D for read). Write Mode In write mode the second byte sent contains the sub address of the selected function to adjust (or controls to affect) and the third byte the corresponding data byte. It is possible to send more than one data byte to the IC. If after the third byte no stop or start condition is detected, the circuit increments automatically the momentary sub address in the sub address counter by one (auto-increment mode). So it is possible to transmit immediately the next data bytes without sending the IC address or sub address. It can be useful so as to reinitialize the whole controls very quickly (flash manner). This procedure can be finished by a stop condition. The circuit has 16 adjustment capabilities: 3 for horizontal part, 4 for vertical one, 2 for E/W correction, 2 for the dynamic horizontal phase control, 1 for moire option, 3 for horizontal and vertical dynamic focus and 1 for B+ reference adjustment. 17 bits are also dedicated to several controls (on/off, horizontal forced frequency, sync priority, detection refresh and XRAY reset). |
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