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4.2. YMCRPR8C25 System Block Diagram
The YMCRPR8C25 board incorporates an R5F21258 (R8C/25) in a 52-pin QFP package from the
R8C/Tiny group of microcontrollers, designated as U17.
Figure 4-2 shows the YMCRPR8C25 block diagram.
R8C25 MCRP Kit
CN-4
24v DC
Supply
Power Supply
&
Conditioning
V
B
U
S
TP-1
TP-5
BLDC
Motor
Speed
Control
R8C/25
MCU
6-PWM
International
Rectifier
(IPM)
CN-1
M
RS232
Shutdown
I/F
Comparators
( Back-EMF)
E8
Debug
I/F
Jumper-1
TP-2
OP-AMP
(Signal Conditioning)
4-LED
PWM / PWR
Status
TP-4
TP-3
Hall Sensor
Inputs
CN-2
Shunt
LCD Segment
Display
CN-3
Push-Button
Current
Switch
Figure 4-2: YMCRPR8C25 Block Diagram
4.3. The YMCRPR8C25 System Component Descriptions
The YMCRPR8C25 System consists of the R8C/25 MCU, an Integrated Power Module and supporting
circuitry, and an LCD module all mounted on a single PCB to drive the included Motor. Below is a detailed
description of the system components.
4.3.1. YMCRPR8C25 Board
The YMCRPR8C25 includes the R8C/25 and support circuitry. Note that to operate the motor the jumpers
must be set correctly for the method selected: sensor (Hall) or sensor-less (Back-EMF). The board is
shipped with the jumpers in the Hall Sensor mode. For details on the jumpers, please consult section 4.5
of this YMCRPR8C25 User’s Manual.
YMCRPR8C25 User’s Manual Rev 1.1
10/ 21
March 2008
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