Add: Ina219 current/voltage sensor over I2C (#381)

- [x] Hardware to be tested, at least it seems to be alive so far

---------

Co-authored-by: Richard Lin <[email protected]>

edg/parts/Ina219.py

@@ -0,0 +1,75 @@
+from edg import *
+from edg.parts.JlcPart import JlcPart
+
+
+class Ina219_Device(InternalSubcircuit, JlcPart, FootprintBlock, Block):
+    @init_in_parent
+    def __init__(self):
+        super().__init__()
+
+        self.vs = self.Port(VoltageSink(
+            voltage_limits=(3, 5.5) * Volt,
+            current_draw=(6 * uAmp, 1 * mAmp)
+        ))
+        self.gnd = self.Port(Ground())
+
+        self.i2c = self.Port(I2cTarget(DigitalBidir.empty(), addresses=[0x40]))
+        self.i2c.sda.init_from(DigitalBidir.from_supply(
+            self.gnd, self.vs,
+            voltage_limit_abs=(-0.3, 6.0) * Volt,
+            input_threshold_factor=(0.3, 0.7)
+        ))
+        self.i2c.scl.init_from(DigitalSink.from_supply(
+            self.gnd, self.vs,
+            voltage_limit_tolerance=(-0.3, 0.3) * Volt,
+            input_threshold_factor=(0.3, 0.7)
+        ))
+
+        self.in_pos = self.Port(AnalogSink(voltage_limits=(-0.3, 26) * Volt))
+        self.in_neg = self.Port(AnalogSink(voltage_limits=(-0.3, 26) * Volt))
+
+    def contents(self):
+        super().contents()
+        self.footprint(
+            'U', 'Package_TO_SOT_SMD:SOT-23-8',
+            {
+                '1': self.in_pos,
+                '2': self.in_neg,
+                '3': self.gnd,
+                '4': self.vs,
+                '5': self.i2c.scl,
+                '6': self.i2c.sda,
+                '7': self.gnd,  # TODO: make this address selectable, sa0 pin
+                '8': self.gnd  # TODO: make this address selectable, sa1 pin
+            },
+            mfr='Texas Instruments', part='INA219AIDCNR',
+            datasheet='https://www.ti.com/lit/ds/symlink/ina219.pdf'
+        )
+        self.assign(self.lcsc_part, "C87469")
+        self.assign(self.actual_basic_part, False)
+
+
+class Ina219(CurrentSensor, Block):
+    """Current/voltage/power monitor with I2C interface"""
+
+    @init_in_parent
+    def __init__(self, shunt_resistor: RangeLike = 2.0 * mOhm(tol=0.05)):
+        super().__init__()
+        self.ic = self.Block(Ina219_Device())
+        self.pwr = self.Export(self.ic.vs, [Power])
+        self.gnd = self.Export(self.ic.gnd, [Common])
+        self.i2c = self.Export(self.ic.i2c)
+
+        self.vs_cap = self.Block(DecouplingCapacitor(0.1 * uFarad(tol=0.2))).connected(self.gnd, self.pwr)
+
+        self.Rs = self.Block(CurrentSenseResistor(
+            resistance=shunt_resistor,
+        ))
+
+        self.sense_pos = self.Export(self.Rs.pwr_in)
+        self.sense_neg = self.Export(self.Rs.pwr_out)
+
+    def contents(self):
+        super().contents()
+        self.connect(self.Rs.sense_in, self.ic.in_pos)
+        self.connect(self.Rs.sense_out, self.ic.in_neg)

edg/parts/__init__.py

@@ -130,6 +130,7 @@
 from .CanTransceiver_Iso1050 import Iso1050dub
 from .CanTransceiver_Sn65hvd230 import Sn65hvd230
 from .CurrentSense_Ad8418 import Ad8418a
+from .Ina219 import Ina219
 from .BatteryProtector_S8261A import S8261A
 from .BatteryCharger_Mcp73831 import Mcp73831
 from .Distance_Vl53l0x import Vl53l0xBase, Vl53l0x, Vl53l0xConnector, Vl53l0xArray