mirror of
https://github.com/diodeinc/pcb.git
synced 2026-09-14 20:17:19 +08:00
Damien Espitallier
119 lines
4.2 KiB
Python
119 lines
4.2 KiB
Python
load("../io.zen", "io")
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load("../interfaces.zen", "Net")
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load("../units.zen", "Capacitance", "Inductance", "Resistance", "Voltage", "Power")
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load("../utils.zen", "format_value")
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Package = enum("0201", "0402", "0603", "0805", "1206", "1210", "2010", "2512")
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Mount = enum("SMD")
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package = config(Package, default=Package("0603"))
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value = config(Resistance)
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mpn = config(str, optional=True, help="Manufacturer Part Number")
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manufacturer = config(str, optional=True, help="Manufacturer")
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mount = config(Mount, default=Mount("SMD"), optional=True, help="Mounting type")
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voltage = config(Voltage, optional=True, help="Maximum operating voltage")
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power = config(Power, optional=True, help="Maximum power dissipation")
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esl = config(Inductance, optional=True, help="Parasitic series inductance (default: 0.5nH)")
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cp = config(Capacitance, optional=True, help="Parasitic parallel capacitance (default: 0.05pF)")
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use_us_symbol = config(bool, default=False, optional=True, help="Use US symbol")
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skip_bom = config(bool, default=False, help="Skip the BOM generation")
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# Properties – combined and normalized
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properties = {
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"value": format_value(value, voltage, power),
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"package": package,
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"resistance": value,
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}
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if voltage:
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properties["voltage"] = voltage
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if power:
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properties["power"] = power
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P1 = io(Net)
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P2 = io(Net)
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def _symbol(mount: Mount, package: Package, use_us_symbol: bool):
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if use_us_symbol:
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name = "R_Small_US"
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else:
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name = "R_Small"
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return "../kicad-symbols/Device.kicad_symdir/" + name + ".kicad_sym"
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def _footprint(mount: Mount, package: Package):
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kicad_footprints = {
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Package("0201"): "../kicad-footprints/Resistor_SMD.pretty/R_0201_0603Metric.kicad_mod",
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Package("0402"): "../kicad-footprints/Resistor_SMD.pretty/R_0402_1005Metric.kicad_mod",
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Package("0603"): "../kicad-footprints/Resistor_SMD.pretty/R_0603_1608Metric.kicad_mod",
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Package("0805"): "../kicad-footprints/Resistor_SMD.pretty/R_0805_2012Metric.kicad_mod",
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Package("1206"): "../kicad-footprints/Resistor_SMD.pretty/R_1206_3216Metric.kicad_mod",
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Package("1210"): "../kicad-footprints/Resistor_SMD.pretty/R_1210_3225Metric.kicad_mod",
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Package("2010"): "../kicad-footprints/Resistor_SMD.pretty/R_2010_5025Metric.kicad_mod",
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Package("2512"): "../kicad-footprints/Resistor_SMD.pretty/R_2512_6332Metric.kicad_mod",
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}
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if package not in kicad_footprints:
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error("Invalid package: " + str(package))
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return kicad_footprints[package]
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def _spice_args(value, package, esl=None, cp=None):
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"""Derive resistor model parameters including HF parasitics.
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ESL and Cp are estimated from package size. For most DC/low-frequency
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work these are negligible, but they matter for filter and high-speed sims.
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"""
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esl_table = {
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Package("0201"): Inductance("0.15nH"),
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Package("0402"): Inductance("0.3nH"),
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Package("0603"): Inductance("0.5nH"),
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Package("0805"): Inductance("0.7nH"),
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Package("1206"): Inductance("1.0nH"),
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Package("1210"): Inductance("1.0nH"),
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Package("2010"): Inductance("1.5nH"),
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Package("2512"): Inductance("2.0nH"),
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}
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cp_table = {
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Package("0201"): Capacitance("0.02pF"),
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Package("0402"): Capacitance("0.04pF"),
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Package("0603"): Capacitance("0.05pF"),
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Package("0805"): Capacitance("0.08pF"),
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Package("1206"): Capacitance("0.1pF"),
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Package("1210"): Capacitance("0.12pF"),
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Package("2010"): Capacitance("0.15pF"),
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Package("2512"): Capacitance("0.2pF"),
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}
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return {
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"RVAL": value,
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"ESL": esl or esl_table.get(package, Inductance("0.5nH")),
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"CP": cp or cp_table.get(package, Capacitance("0.05pF")),
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}
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Component(
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name="R",
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part=builtin.Part(mpn=mpn, manufacturer=manufacturer) if mpn and manufacturer else None,
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symbol=Symbol(_symbol(mount, package, use_us_symbol)),
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footprint=File(_footprint(mount, package)),
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prefix="R",
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pins={
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"1": P1,
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"2": P2,
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},
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spice_model=SpiceModel(
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"spice/Resistor.lib",
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"R",
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nets=[P1, P2],
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args=_spice_args(value, package, esl, cp),
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),
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properties=properties,
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type="resistor",
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skip_bom=skip_bom,
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)
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