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ISL24006IRZ-T7 Datenblatt(PDF) 6 Page - Intersil Corporation |
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ISL24006IRZ-T7 Datenblatt(HTML) 6 Page - Intersil Corporation |
6 / 10 page 6 FN6110.1 September 9, 2005 General Description The ISL24006 provides a versatile method of providing the reference voltages that are used in setting the transfer characteristics of LCD display panels. The V/T (Voltage/Transmission) curve of the LCD panel requires that a correction is applied to make it linear. However, if the panel is to be used in more than one application, the final curve may differ for different applications. By using the ISL24006, the V/T curve can be changed to optimize its characteristics according to the required application of the display product. Each of the 14 reference voltage outputs can be set with a 8- bit resolution. The first half of the output buffers, OUT1 to OUT7 can be operated from VREFU_L to VREFU_H. The second half OUT8 to OUT14 can swing from VREFL_L to VREFL_H. It is also possible to use the ISL24006 for applications other than LCDs where multiple voltage references are required that can be set to 8-bit accuracy. Digital Interface The ISL24006 uses a simple two-wire I2C interface to program all 14 outputs. The bus line SCLK is the clock signal line and bus SDA is the bi-directional data information signal line. The ISL24006 can support a clock rate up to 400kHz. An external pull up typically 1k Ω resistor is required for each bus line. Start and Stop Condition A Start condition is a high to low transition on the serial data line (SDA) line while the serial clock line (SCLK) holds high. The Stop condition is a low to high transition on the SDA line while SCLK is high. The master device always generates Start and Stop conditions. The bus is considered to be busy after the Start condition and to be free at a certain time interval after the Stop condition. The two bus lines must be high when the buses are not in use. The I2C Timing Diagram 2 (Figure 2) shows the format. Data Validity The data on the SDA line must be stable (clearly defined as HI or LO) during the HI period of the clock signal. SDA transition can only change when the clock signal on the SCLK line is LO. FIGURE 2. I2C TIMING DIAGRAM 2 Byte Format Every byte put along the SDA line must be eight bits long. The number of bytes that can be transmitted between a Start and Stop condition is unrestricted. Data is always transferred with the most significant bit (MSB) first. Acknowledge Each byte is followed by an acknowledge bit. When a master device is sending data (WRITE) the master puts a resistive high level on the SDA line during the acknowledge clock pulse. The peripheral that acknowledges, which is the receiver, has to pull down the SDA line during the acknowledge pulse. When a master device is receiving data (READ) the slave puts a resistive high level on the SDA line during the acknowledge clock pulse. The master will acknowledge by pulling down the SDA line during the acknowledge pulse. Not Acknowledge A Not Acknowledge (NA) is when the receiver does not pull down the SDA line during the acknowledge pulse: SDA line remains in the HI or in a high impedance state. A Not Acknowledge is the master device's signal to the slave device to release the SDA line so the master device can generate a Stop signal on the same line. The NA indicates that data just received is the last byte of the data transfer. Standard Mode When pin #6 (STD_REG) is pulled high, the part operates in Standard Mode, which is more commonly used than the Register Mode. In the Standard Mode, the user can program all outputs in one data stream or transfer frame. For the Standard Mode in a WRITE transfer, a master device sends data to program all the output buffers of the ISL24006. The input data byte (DATA 1) to the first channel (OUT1) is the third byte following the control byte. The second channel (OUT2) is programmed by the fourth byte (DATA 2), and so on. Each byte is followed by an acknowledge bit. gg Start, Stop and Timing Details of I2C Interface SDA DATA SCL CLOCK Start Condition Data Clocked in Stop Condition tS tH tS tF tR tH ISL24006 |
Ähnliche Teilenummer - ISL24006IRZ-T7 |
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Ähnliche Beschreibung - ISL24006IRZ-T7 |
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