Pins

In typeCAD, the Pin object represents the pin/leg/lead/ball etc. of a component.

Pin Access Methods

There are two ways to access pins in typeCAD:

Numeric Pin Access: component.pin(number)

Use this for simple components like passives where pin numbers are straightforward:

import { Resistor } from '@typecad/passives/0805'
let r1 = new Resistor({ value: '1kohm' });

r1.pin(1);      // first pin
r1.pin(2);      // second pin

Named Pin Access: component.PINNAME

Use this for complex components (ICs, connectors) where pins have descriptive names:

import { ATtiny85_20S } from './ATtiny85_20S';
let u1 = new ATtiny85_20S();

u1.VCC      // power pin (internally pin 8)
u1.GND      // ground pin (internally pin 4)
u1.PB0      // GPIO pin PB0

When to use each:

• Passives (resistors, capacitors, LEDs): Use component.pin(1), component.pin(2)
• ICs and complex components: Use named pins like component.VCC, component.GND
• Connectors: Can use either connector.pin(1) or named pins if defined

Power aware

Each Pin object has a powerInfo object that can be optionally passed when creating the Pin. It has the following properties:

• minimum_voltage — minimum voltage the pin can tolerate
• maximum_voltage — maximum voltage the pin can tolerate
• current — maximum current the pin can handle

When pins have the object passed with data, typeCAD can check that the voltage levels and current draw are compatible with each other.

  VCC = new Pin(this.reference, 8, 'power_in', this, {
    minimum_voltage: -0.5,
    maximum_voltage: 6,
    current: 0.2,
  });