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RAJ306101 RSSK User's Manual
4.3.2.5
Phase Voltage Detection
The Evaluation Board has a voltage divider circuit to input the phase voltages (U, V, and W phase) to the A/D
converter input port of the MCU through the built-in differential amplifier of the smart gate driver. The relation
between the phase voltages and detection voltage is expressed by EQ 4-4.
Vout [ ���� ] = (0.5803 ∗ ������������ [ ���� ] ) + 0.0205 × �������� ���� [����]
EQ 4-4
Vin
Vin : Phase voltage
VDD : Smart Gate Driver VDD pin voltage
Vout : Voltage applied to A/D converter input port of the MCU
4.3.2.6
Thermistor for MOSFET
The Evaluation Board has a thermistor (Z101) for MOSFET temperature measurement. However, R150 and
R175 are mounted and R152 is not mounted in the Evaluation Board default settings, so a MOSFET
thermistor (Z101) or an external thermistor cannot be used. When using a thermistor for MOSFET, remove
R150 and mount a 0[Ω] resistor to R152 to connect the thermistor (Z101) on the board to P42/ANI002.
When using an external thermistor, remove R150 and R175 and mount a 0[Ω] resistor to R152 to allow the
external thermistor connected to TH (Pin 7) of CN_EXT_MOS to be connected to P42/ANI002.
Note.1: The MOSFET temperature measurement function by the thermistor is not supported by the sample program. When using a
thermistor, please change the program by user.
4.3.3
Spare Circuit
The Evaluation Board has a PAD on which parts can be mounted as a spare circuit. If strong ringing occurs in
the BEMF waveform, it is recommended to implement a snubber circuit if necessary.
R12UZ0129EJ0100
Rev.1.00
Nov 1, 2023
V
_DA1P
U
470[kΩ]
V
_DA2P
V
V
_DA3P
W
2[kΩ]
0.022[µF]
Figure 4-11 Phase Voltage Detection Circuit
V
U
V
V
V
W
Figure 4-12 Spare Circuit
Smart
Gate
Driver
VDD/2
+
Diff.
Amp.
-
Vout
Chapter 4. Peripheral Circuits
VDD
V
U
V
V
V
W
Page 44 of 55
Note.1
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