Renesas RAA306012 User Manual page 69

RAA306012 RSSK User's Manual
4.3.2.2 Current Sense (External)
The Evaluation Board has current sense circuits including shunt resistors to detect the U, V, and W phase
currents. The current sense circuits the voltage drop resulting from the current flow to the shunt resistor, and
the result is input to the MCU. The relation between the phase current (Iin) flow to the shunt resistor (Rs) and
the voltage input to the MCU (Vout) is expressed by EQ 4-2.
Vout [ ���� ] = Iin [ ���� ] × Rs [ ���� ] × 5 + �
EQ 4-2
R12UZ0128EJ0100 Rev.1.00
Nov 1, 2023
AMP_VCC [ ���� ]
2[kΩ]
Iin Rs
2[kΩ]
20[kΩ]
Iin : Current flow to shunt resistor
Rs : Shunt resistor (0.05[Ω])
AMP_VCC : Amplifier VCC pin voltage
Vout : Voltage applied to A/D converter input port of the MCU
Figure 4-9 Current Sense Circuits (External)
�
2
AMP_VCC
20[kΩ]
+
Amp.
-
Vout
10[kΩ]
4. Peripheral Circuits
I _OPA
U
I _OPA
V
I _OPA
W
Page 60 of 76