+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 └───────────┘ Pin 5 (NC) ── No Connection
When searching for a "top view pinout diagram," engineers are typically looking down at the component as it sits on a Printed Circuit Board (PCB). The 1N518 is typically housed in a DO-35 (Glass Axial) package. This package is a small glass cylinder with axial leads (wires coming out of both ends). inx in518 ic pinout diagram top
Here is how to interpret the "pinout" from the top view: +Vin (5V) │ ┌┴┐ │ │ C1 │
| 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) | When searching for a "top view pinout diagram,"
Note: Pin 1 location is indicated by a small dot or chamfered edge on the top-left of the IC package.