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LT768x Schematic Check Flow
1.
LT768x clock input can use the MCU's PWM output (Figure 1), the active crystal, or the quartz
crystal (Figure 2, typically 10MHz). Because MCU usually have multiple channels of PWM outputs,
it is recommended to provide one channel for LT768x, which can save the cost, too. The shorter
the clock signal line, the better, and try to avoid other signal lines. If you want to use a quartz
crystal, it is recommended to use a four-pin 3225 package 10M crystal, and the 15pF capacitor on
the crystal 2 end does not need to be soldered.
2.
Check whether any error in correspondent schematic.
3.
RGB interface: check if PCLK, PDE, HSYNC, VHYNC corresponds to panel interface; series
resistor reserve a test point; data line must be aligned high; If panel require SPI initialize, SPI
should reserve a test port.
4.
Check whether IC power supply is correct?
5.
VDD_3.3V: whether the filter capacitor 0.1uF is connected.
6.
VDDC_1.8V: whether filter capacitor 1uF and 0.1uF is connected.
7.
PWM[0] : whether reserved 10K pull-up resistor is added? (display initialize picture)
MCU interface setting ：check if PSM[2:0] corresponds to MCU interface.
8.
Figure 1 ： LT768x Clock Circuit - 1
Figure 2 ： LT768x Clock Circuit - 2
Page -1-
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Table of Contents
Related Manuals for LeveTop LT768 Series
Summary of Contents for LeveTop LT768 Series
- Page 1 LT768x Schematic Check Flow LT768x clock input can use the MCU's PWM output (Figure 1), the active crystal, or the quartz crystal (Figure 2, typically 10MHz). Because MCU usually have multiple channels of PWM outputs, it is recommended to provide one channel for LT768x, which can save the cost, too. The shorter the clock signal line, the better, and try to avoid other signal lines.
- Page 2 Figure 3 ： LT768xMCU Interface Setting Check if SPI Flash download interface is connected: Figure 4 ： SPI Flash Download Interface 10. 768 RESET pin should be pull out, it will be used when burn FLASH 11. Does the component's parameter value / voltage value reasonable? Does it meet the circuit requirements? 12.
- Page 3 Add RC circuit on MCU to LT7680 SPI CLK. (Figure 9). Add RC circuit on LT7680 to SPI Flash CLK. (Figure 10). Coat the TFT FPC. (Figure 11). Add series resistor on LT768 RGB output Add series resistor and GND capacitor on PCLK, PDE, HSYNC, VHYNC. (Figure 12). ...
- Page 4 Figure 8 ： TFT Backlight DC to DC Example Figure 9 ： MCU to LT7680 SPI CLK Adding RC Figure 10 ： LT768 to SPI Flash CLK Adding RC Page -4-...
- Page 5 Figure 11 ： TFT Panel FPC Coating Figure 12 ： RGB output adding series resistor and GND capacitor Page -5-...
- Page 6 LT768x PCB Layout Check flow There is no error in the PCB schematic. The spacing between the power supply and the GND should be sufficient to avoid short circuit in the board or soldering. Under sufficient condition, the line of high current should be expanded and thickened as much as possible and the number of PCB holes should be increased.
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