import Crystal, Capacitor

crystal = new Crystal
crystal.frequency = 16MHz +/- 20ppm
crystal.frequency_tolerance = 20ppm
crystal.load_capacitance = 18pF +/- 10%
crystal.equivalent_series_resistance = 80ohm +/- 20%
crystal.package = "HC49U"

# Connect to microcontroller with load capacitors
load_cap1 = new Capacitor
load_cap2 = new Capacitor
load_cap1.capacitance = 22pF +/- 5%
load_cap2.capacitance = 22pF +/- 5%

mcu.xtal1 ~ crystal.unnamed[0]
mcu.xtal2 ~ crystal.unnamed[1]
crystal.unnamed[0] ~> load_cap1 ~> crystal.gnd
crystal.unnamed[1] ~> load_cap2 ~> crystal.gnd
crystal.gnd ~ power_supply.lv

​
Parameters

​
equivalent_series_resistance
ohm
​
frequency
hertz
​
frequency_ageing
ppm
​
frequency_temperature_tolerance
ppm
​
frequency_tolerance
ppm
​
load_capacitance
farad
​
shunt_capacitance
farad

​
Interfaces

​
gnd
Electrical
​
unnamed[0]
Electrical
​
unnamed[1]
Electrical

​
Global Attributes

These attributes are available to all modules and interfaces in a design.
​
lcsc_id
str
Assign the LCSC ID of the module.If set, this will tell the picker to select that part from LCSC for this block.
​
manufacturer
str
This module’s manufacturer name, as a string.Only exact matches on the manufacturer’s name will be found by the picker. It’s recommended to fill this information based on what ato create component provides.
​
mpn
str
This module’s manufacturer part number, as a string.For the picker to select the correct part from the manufacturer, this must be set.
​
package
str
The package of the module.This drives which components can be selected, and what footprint is used.Must exactly match a known package name.
​
exclude_from_bom
bool
​
override_net_name
str
When set on an interface, this will override the net name of the interface.This is useful for renaming nets which are automatically generated.
​
required
bool
Only for ModuleInterfaces. If set to True, require that interface is connected to something outside of the module it’s defined in.
import Crystal, Capacitor

crystal = new Crystal
crystal.frequency = 16MHz +/- 20ppm
crystal.frequency_tolerance = 20ppm
crystal.load_capacitance = 18pF +/- 10%
crystal.equivalent_series_resistance = 80ohm +/- 20%
crystal.package = "HC49U"

# Connect to microcontroller with load capacitors
load_cap1 = new Capacitor
load_cap2 = new Capacitor
load_cap1.capacitance = 22pF +/- 5%
load_cap2.capacitance = 22pF +/- 5%

mcu.xtal1 ~ crystal.unnamed[0]
mcu.xtal2 ~ crystal.unnamed[1]
crystal.unnamed[0] ~> load_cap1 ~> crystal.gnd
crystal.unnamed[1] ~> load_cap2 ~> crystal.gnd
crystal.gnd ~ power_supply.lv