CHAPTER 2 HARDWARE CONFIGURATION
Application Note U17209EJ1V0AN
19
2.2 Circuit Diagram
Figures 2-2 to 2-6 show diagrams of the sample reference system circuit.
This sample reference system circuit diagram includes the V850E/IA1, V850E/IA2, V850E/IA3, V850E/IA4, or
V850E/MA3, a reset circuit, oscillator, a pin handling microcontroller peripheral block, operation mode switch block,
LED output block, watchdog timer circuit block, drive circuit block, motor controller, and motor revolution indicator.
(1) Microcontroller and microcontroller peripheral block
The V850E/IA1, V850E/IA2, V850E/IA3, V850E/IA4, or V850E/MA3 includes a reset circuit, an oscillator that
uses a resonator, and a block for handling the MODE pin and unused pins.
(2) Operation mode switch block
This includes switches that set the operation mode as CW or CCW operation.
(3) LED output block
This block includes 16 LEDs, which are used to indicate the revolution speed (rpm), errors, etc.
(4) Watchdog timer circuit block
This block uses the
µ
PD74HC123A to output stop signals when pulse output from the V850E/IA1, V850E/IA2,
V850E/IA3, V850E/IA4, or V850E/MA3 stops for one ms or longer.
(5) Drive circuit block
The 6-phase outputs from the inverter timer are converted to U-, V-, and W-phase output for the motor driver.
This drive circuit is not shown in detail in this example, since it varies depending on the motor’s specifications.
(6) Motor controller
This block includes the HPS-3-AS, LM324, and other devices that are used to measure the motor’s U and V
drive currents via A/D conversion.
(7) Motor rotation indicator
This block includes a volume adjuster and the LM324 for setting the motor’s revolution speed (rpm).
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General