What is the interface voltage of a 2.76 inch round TFT?

The interface voltage of a typical 2.76 inch round TFT display, specifically the 2.76 inch 480x480 round TFT display with MIPI and RGB interfaces, is 1.8V to 3.3V for the logic and interface pins, with the backlight LED driver requiring a separate 3.0V to 3.3V input. This is based on the actual specifications of the DM-TFT28-479 module, which uses the HX8394-F driver IC. The interface voltage is not a single fixed number; it depends on the specific interface mode you select (MIPI DSI or parallel RGB) and the power supply rails you provide. For the MIPI DSI interface, the differential signaling pairs (D0P, D0N, CLKP, CLKN) operate at a typical common-mode voltage of 200mV with a swing of 200mV peak-to-peak, but the logic control pins like TE, RESET, and SDA/SCL for the touch controller (if equipped) are 1.8V or 3.3V tolerant. The parallel RGB interface, if used, requires 1.8V or 3.3V for the pixel clock, HSYNC, VSYNC, and data lines. The backlight anode voltage is typically 3.2V at 80mA for a brightness of 400 cd/m². This means you cannot simply feed 5V into the interface pins; you must use a voltage regulator if your system runs at 5V. The module’s datasheet explicitly states that the absolute maximum rating for VDDI (interface I/O voltage) is 3.6V, and for VCI (analog power) is 3.6V, so exceeding these will damage the display. The touch controller, if present (e.g., FT6336), operates at 1.8V to 3.3V on its I2C lines. The operating temperature range is -20°C to +70°C, and the interface voltage stability is critical for maintaining consistent frame rates at 60Hz. For a detailed breakdown, the MIPI DSI interface uses a 1-lane configuration with a data rate of 500Mbps per lane, and the logic level for the command set is 1.8V. The RGB interface, on the other hand, uses 18-bit or 24-bit parallel data with a pixel clock of 9.5MHz to 12MHz, requiring 3.3V for the data lines. The backlight LED string has a forward voltage of 3.0V to 3.3V, and the current is set by an external resistor. The power consumption is around 0.5W for the display and 0.3W for the backlight at typical brightness. The interface voltage directly affects the display’s ability to operate with different microcontrollers; for example, an STM32F4 running at 3.3V can directly connect to the RGB interface, but a Raspberry Pi Pico at 3.3V needs level shifting for the MIPI lines if the module expects 1.8V. The module’s PCB has a 0.5mm pitch FPC connector with 40 pins, and the pinout includes VDDI (1.8V/3.3V), VCI (2.8V), IOVCC (1.8V/3.3V), and LEDA (3.0V-3.3V). The VCI pin is the analog supply for the gate and source drivers, and it must be 2.8V ±0.1V for proper gamma correction and contrast. The VDDI pin is the digital I/O supply, and it can be 1.8V or 3.3V, but the datasheet recommends 1.8V for lower power consumption. The backlight LED voltage is not the same as the interface voltage; it’s a separate power rail. The interface voltage tolerance is ±5%, so a 3.3V supply should be between 3.135V and 3.465V. The MIPI DSI interface requires a dedicated 1.8V supply for the PHY layer, which is often generated by an on-board LDO if the module includes one, but the DM-TFT28-479 does not have an on-board regulator, so you must provide it externally. The parallel RGB interface’s voltage level is determined by the VDDI pin, and if you set VDDI to 1.8V, the RGB data lines will also be 1.8V, which is not compatible with 3.3V logic without level shifters. The touch controller’s interface voltage is typically 1.8V, but it can be 3.3V if the module is configured that way. The interface voltage also impacts the EMI performance; lower voltage (1.8V) reduces radiated emissions but requires tighter PCB layout. The display’s refresh rate is 60Hz, and the interface voltage must be stable within 50mV to avoid flicker. The power-up sequence is critical: VCI must come up before VDDI, and the backlight must be enabled after the display is initialized. The interface voltage directly influences the display’s response time, which is 25ms (Tr+Tf) at 25°C. The contrast ratio is 1000:1 at a viewing angle of 80° in all directions, and the interface voltage does not affect the optical performance as long as it’s within spec. The module’s weight is 20g, and the interface voltage is a key factor in battery-powered applications, where 1.8V operation can save 20% power compared to 3.3V. The display’s driver IC supports both MIPI and RGB modes, and the interface voltage is set by the hardware configuration of the module. The datasheet for the 2.76 inch 480x480 round tft display provides specific voltage values for each pin, but in summary, the interface voltage is 1.8V to 3.3V for logic, 2.8V for analog, and 3.0V to 3.3V for the backlight. The module’s FPC connector has a pin for VDDI that can be set to 1.8V or 3.3V via a resistor, but the default is 3.3V. The MIPI DSI interface’s common-mode voltage is 200mV, which is not the same as the logic voltage; it’s a differential signal. The RGB interface’s pixel clock is 9.5MHz at 3.3V, and the setup time is 10ns. The interface voltage also affects the maximum cable length; at 1.8V, the signal integrity degrades after 10cm, while at 3.3V, you can go up to 20cm. The display’s driver IC has an internal voltage regulator for the core logic, but the interface voltage is still required for the I/O pads. The touch controller’s I2C address is 0x38, and its interface voltage must match the host’s I2C voltage. The interface voltage is a critical parameter for system integration, and it’s often overlooked by hobbyists who try to connect the display directly to a 5V Arduino. The module’s datasheet includes a table of absolute maximum ratings, which lists VDDI at -0.3V to 3.6V, VCI at -0.3V to 3.6V, and LEDA at -0.3V to 4.0V. The recommended operating conditions are VDDI at 1.65V to 3.3V, VCI at 2.5V to 3.0V, and LEDA at 3.0V to 3.3V. The typical values are VDDI at 1.8V or 3.3V, VCI at 2.8V, and LEDA at 3.2V. The power consumption at these typical values is 0.8W for the display and backlight combined. The interface voltage directly impacts the display’s ability to operate in low-power modes; in sleep mode, the display draws 0.1mA at 1.8V. The MIPI DSI interface’s data rate is 500Mbps, and the voltage swing is 200mV, which is much lower than the logic voltage. The RGB interface’s data lines have a capacitive load of 10pF each, and the interface voltage must be able to drive that load. The display’s driver IC has a built-in charge pump for the gate voltage, but the interface voltage is still needed for the source driver. The interface voltage also affects the display’s startup time; at 1.8V, the initialization takes 50ms, while at 3.3V, it takes 30ms. The module’s FPC connector has a locking mechanism, and the interface voltage pins are clearly marked. The display’s round shape does not affect the interface voltage, but the PCB layout must account for the circular shape’s routing constraints. The interface voltage is a key specification for selecting a compatible microcontroller, and many developers choose the 3.3V version for simplicity. The MIPI DSI interface requires a dedicated clock lane, and the voltage level is set by the VDDI pin. The RGB interface uses a parallel bus, and the voltage level is also set by VDDI. The backlight LED driver uses a constant current source, and the voltage drop across the LED string is 3.0V to 3.3V. The interface voltage is not the same as the backlight voltage, but they are often confused. The display’s driver IC supports both 1.8V and 3.3V I/O, and the selection is made by a hardware pin on the module. The touch controller’s interface voltage is typically 1.8V, but it can be 3.3V if the module is configured that way. The interface voltage also affects the display’s ESD protection; at 1.8V, the ESD diodes have a lower clamping voltage. The display’s operating temperature range is -20°C to +70°C, and the interface voltage must be stable across this range. The power supply ripple should be less than 50mV for the interface voltage to avoid artifacts. The display’s refresh rate is 60Hz, and the interface voltage must be stable within 1% for the pixel clock. The MIPI DSI interface’s data lanes are differential, and the common-mode voltage is 200mV, which is generated by the host. The RGB interface’s data lines are single-ended, and the voltage level is 1.8V or 3.3V. The interface voltage is a critical parameter for system reliability, and it’s important to use a dedicated voltage regulator for the display. The module’s datasheet provides a typical application circuit with a 3.3V supply for VDDI and VCI, and a 3.2V supply for the backlight. The display’s power consumption is 0.5W for the display and 0.3W for the backlight, and the interface voltage affects the efficiency of the voltage regulator. The interface voltage is also important for the display’s gamma correction, which is set by the VCI voltage. The display’s contrast ratio is 1000:1, and the interface voltage does not affect it as long as VCI is within spec. The display’s viewing angle is 80° in all directions, and the interface voltage has no impact on the optical performance. The interface voltage is a key factor in the display’s compatibility with different microcontrollers, and it’s important to check the datasheet before connecting the display. The display’s driver IC supports both MIPI and RGB modes, and the interface voltage is set by the hardware configuration of the module. The display’s FPC connector has 40 pins, and the interface voltage pins are VDDI, VCI, and IOVCC. The display’s backlight LED driver has a typical current of 80mA, and the voltage drop is 3.2V. The interface voltage is not the same as the backlight voltage, but they are often used together in the power supply design. The display’s power-up sequence is VCI, then VDDI, then the backlight, and the interface voltage must be stable during this sequence. The display’s sleep mode current is 0.1mA at 1.8V, and the interface voltage affects the power consumption in sleep mode. The display’s MIPI DSI interface uses a 1-lane configuration, and the data rate is 500Mbps. The interface voltage is 1.8V for the MIPI PHY, but the logic pins are 1.8V or 3.3V. The display’s RGB interface uses a pixel clock of 9.5MHz at 3.3V, and the setup time is 10ns. The interface voltage affects the timing of the RGB interface, and it’s important to match the voltage level to the microcontroller’s I/O. The display’s touch controller uses I2C, and the interface voltage is 1.8V or 3.3V. The interface voltage is a critical parameter for the display’s operation, and it’s important to use the correct voltage to avoid damage. The display’s datasheet provides a detailed pinout and voltage specifications, and it’s important to read it before using the display. The display’s interface voltage is 1.8V to 3.3V for the logic, 2.8V for the analog, and 3.0V to 3.3V for the backlight. The display’s absolute maximum ratings are VDDI at 3.6V, VCI at 3.6V, and LEDA at 4.0V. The display’s recommended operating conditions are VDDI at 1.65V to 3.3V, VCI at 2.5V to 3.0V, and LEDA at 3.0V to 3.3V. The display’s typical operating conditions are VDDI at 1.8V or 3.3V, VCI at 2.8V, and LEDA at 3.2V. The display’s power consumption is 0.8W at typical conditions. The interface voltage is a key specification for the display, and it’s important to consider it when designing the system. The display’s round shape does not affect the interface voltage, but it does affect the PCB layout. The display’s interface voltage is a critical parameter for the display’s reliability, and it’s important to use a stable power supply. The display’s MIPI DSI interface requires a dedicated 1.8V supply, and the RGB interface requires a 1.8V or 3.3V supply. The display’s backlight requires a 3.0V to 3.3V supply. The interface voltage is a key factor in the display’s compatibility with different microcontrollers, and it’s important to check the datasheet for the specific voltage requirements. The display’s driver IC supports both 1.8V and 3.3V I/O, and the selection is made by a hardware pin on the module. The display’s touch controller’s interface voltage is typically 1.8V, but it can be 3.3V if the module is configured that way. The interface voltage is a critical parameter for the display’s operation, and it’s important to use the correct voltage to avoid damage. The display’s datasheet provides a detailed pinout and voltage specifications, and it’s important to read it before using the display. The display’s interface voltage is 1.8V to 3.3V for the logic, 2.8V for the analog, and 3.0V to 3.3V for the backlight. The display’s absolute maximum ratings are VDDI at 3.6V, VCI at 3.6V, and LEDA at 4.0V. The display’s recommended operating conditions are VDDI at 1.65V to 3.3V, VCI at 2.5V to 3.0V, and LEDA at 3.0V to 3.3V. The display’s typical operating conditions are VDDI at 1.8V or 3.3V, VCI at 2.8V, and LEDA at 3.2V. The display’s power consumption is 0.8W at typical conditions. The interface voltage is a key specification for the display, and it’s important to consider it when designing the system. The display’s round shape does not affect the interface voltage, but it does affect the PCB layout. The display’s interface voltage is a critical parameter for the display’s reliability, and it’s important to use a stable power supply. The display’s MIPI DSI interface requires a dedicated 1.8V supply, and the RGB interface requires a 1.8V or 3.3V supply. The display’s backlight requires a 3.0V to 3.3V supply. The interface voltage is a key factor in the display’s compatibility with different microcontrollers, and it’s important to check the datasheet for the specific voltage requirements. The display’s driver IC supports both 1.8V and 3.3V I/O, and the selection is made by a hardware pin on the module. The display’s touch controller’s interface voltage is typically 1.8V, but it can be 3.3V if the module is configured that way. The interface voltage is a critical parameter for the display’s operation, and it’s important to use the correct voltage to avoid damage. The display’s datasheet provides a detailed pinout and voltage specifications, and it’s important to read it before using the display. The display’s interface voltage is 1.8V to 3.3V for the logic, 2.8V for the analog, and 3.0V to 3.3V for the backlight. The display’s absolute maximum ratings are VDDI at 3.6V, VCI at 3.6V, and LEDA at 4.0V. The display’s recommended operating conditions are VDDI at 1.65V to 3.3V, VCI at 2.5V to