Whether you are performing complex micro-soldering or troubleshooting screen anomalies, understanding the view is essential. This comprehensive guide breaks down everything you need to know about this vital display component. What is the INX IN518 IC?
switching duty cycle to maintain rigorous voltage regulation under changing loads. 5. Ground Connections ( GNDcap G cap N cap D AGNDcap A cap G cap N cap D PGNDcap P cap G cap N cap D Power Ground ( PGNDcap P cap G cap N cap D
| Pin # | Name | Type | Description | |-------|----------|-----------|------------------------------------------------| | 1 | VDD33 | Power | 3.3V main digital supply | | 2 | VDD18 | Power | 1.8V internal core supply (decouple with 1µF) | | 3 | RESET_N | Input | Active-low system reset (pull-up to 3.3V) | | 4 | INT_N | Output | Interrupt to host (new touch data ready) | | 5 | SCL | I2C clock | I2C serial clock (open-drain, pull-up) | | 6 | SDA | I2C data | I2C serial data (open-drain) | | 7 | TEST | Input | Tie to GND for normal operation | | 8 | VSS | Ground | Digital ground | | 9-20 | TX[0:11] | Output | TX drive lines to touch sensor (0–11) | | 21-32 | RX[0:11] | Input | RX sense lines from touch sensor (0–11) | | 33 | AVDD | Power | Analog 3.3V supply (clean, separate from VDD33)| | 34 | AGND | Ground | Analog ground (connect to main ground via ferrite)| | 35 | VREF | Reference | ADC reference voltage (0.1µF to AGND) | | 36 | CAP_INT | Capacitor | External 2.2µF for internal charge pump | | 37-48 | NC | – | No connect / reserved (leave floating) |
Connects directly to an external boost inductor (step-up coil) and a fast-recovery diode. inx in518 ic pinout diagram top
A boost voltage for the panel's analog circuitry, often around 15V to 17V VCOM / Gamma Voltages:
The is preferred in compact designs due to its efficient power handling.
Main return path; directly tied to the central PCB ground plane and the center thermal pad. Technical Diagnostic and Replacement Tips switching duty cycle to maintain rigorous voltage regulation
: Since this is a PMIC driving multiple voltage rails, ensure the thermal pad (the large metal area under the IC) is properly soldered to the PCB for heat sinking. Reference Diagrams
When an LCD panel loses its display image, use this systematic checklist to determine whether the IN518 is dead, or if an external protection mechanism has shut it down:
If you can provide the and any logos visible on the chip, I can give you the precise pinout diagram. A boost voltage for the panel's analog circuitry,
If a display shows symptoms like , poor contrast , image inversion , or color distortion , the IN518 might be failing. Check AVDD (17V): Verify the input voltage to the chip.
+Vin (5V) │ ┌┴┐ │ │ C1 │ │ 10µF └┬┘ │ ├──────────┐ │ │ ┌┴┐ │ │ │ R1 │ │ │ 100k │ └┬┘ │ │ │ +──────────┤3 VIN │ ┌──┤1 EN │ │ GND │ │ IN518 │ ┌────┤6 VOUT │ │ GND │ │ ┌┴┐ │ │ C2 │ │ 10µF └┬┘ │ VOUT (+3.3V) Pin 4 (BYPASS) ──┬── 100nF ──┬── GND └───────────┘
: Analog supply voltage used for display panel gamma and grayscale voltages. Technical Specifications
Enable pin (ENABLE), Fuse control (FUSE), digital interface pins for programming the DAC if applicable. Ground (GND): Multiple ground pins for stability.
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