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| 型号： | YMCRPR8C25 |
| 厂商： | Renesas Electronics America |
| 文件页数： | 17/21页 |
| 文件大小： | 0K |
| 描述： | REF PLATFORM MOTOR CTRL R8C/25 |
| 标准包装： | 1 |
| 主要目的： | 电源管理，电机控制 |
| 嵌入式： | 是，MCU，16 位 |
| 已用 IC / 零件： | R5F21258（R8C/25） |
| 主要属性： | 3 相无刷 DC（BLDC）电机 |
| 次要属性： | GUI，霍尔传感器和无传感器（反电势） |
| 已供物品： | 板，线缆，调试适配器，电机，电源，软件 |
| 产品目录页面： | 753 (CN2011-ZH PDF) |
| 相关产品： | R5F21258SDFP#V0-ND - IC R8C/25 MCU FLASH 52LQFP R5F21258SNFP#V0-ND - IC R8C/25 MCU FLASH 52LQFP |
Appendix B. Hardware Notes
B.1 Over-Current Circuit
The YMCRPR8C25 makes current measurements on the low side of the IPM though a 0.05 ohm, non-
inductive resistor. This shunt voltage is fed into the gain stage (node SU in figure B-1). The gain is set at
2.2.
R120 sets the “trip” threshold on the over-current monitor to provide an “over-current” signal (node FO).
The FO signal is fed to the INT0 pin of the R8C/25 to generate an interrupt and shutdown the PWM
signals to the motor. The Hardware shutdown is to provide fast protection to the power stages in your
motor design, the software signal is to provide a methodology for your software to “recover” or “notify” in
the event of an over-current fault.
The circuit comes from the factory with the trip point (pin 2 of R120) set to 1.0 Volts, which equates to a
trip point of about 4.9A at 85% duty cycle on the PWM.
NOTE: this circuit measures the Bus current which in 6-step is typically the same as motor current. For
other modulation methods, this may not be the case and customer is advised to analyze their
requirements when utilizing other modulation methods.
Figure B-1: Over-current Circuit
YMCRPR8C25 User’s Manual Rev 1.1
17/ 21
March 2008
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