3.22EjemploDRM007 Co..
3.22EjemploDRM007 Co..
3.22EjemploDRM007 Co..
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Hardware Design <strong>Co</strong>nsiderations<br />
4.4 RS-232 interface and MON08 Hardware Interface<br />
The board provides an RS-232 interface by the use of an optoisolator<br />
referenced at 5 Vdc voltage level (IC8). This topology lets the user<br />
program the microcontroller using the MON08 interface, and<br />
communicate via the RS-232 interface when operating in run mode. This<br />
topology also, allows operating the board ground at a different level than<br />
the PC (or RS-232 device), avoiding the risk of damaging the board or<br />
the PC. See Figure 4-3.<br />
5<br />
/IRQ<br />
MC68HC908MR8<br />
IC9<br />
PTB0/RxD<br />
14<br />
PTB1/TxD<br />
15<br />
+15V R39<br />
2.2k<br />
C32<br />
0.1uF<br />
1x3 PIN HEADER<br />
JP1<br />
VCC<br />
D20<br />
8.2V<br />
S3<br />
ENTER<br />
R30<br />
10k<br />
C42<br />
10uF/10V<br />
VCC<br />
VCC<br />
+<br />
R60<br />
1K<br />
RxD<br />
TxD<br />
R57<br />
1K<br />
VCC<br />
R41<br />
330<br />
+<br />
C18<br />
10uF/35V<br />
D2 1<br />
8<br />
1N4148<br />
2 7<br />
IC8<br />
3 LTV-827S<br />
6<br />
4<br />
+<br />
C17<br />
10uF/35V<br />
5<br />
R34<br />
2.2K<br />
D1 1N4148<br />
D4 1N4148<br />
D3 1N4148<br />
D9 1N4148<br />
GND<br />
DTR<br />
TxD<br />
RTS<br />
RxD<br />
5<br />
9<br />
4<br />
8<br />
3<br />
7<br />
2<br />
6<br />
1<br />
R48<br />
100K<br />
R4<br />
1K<br />
Q7<br />
2N2222<br />
Figure 4-3. RS-232 and MON08 Interfaces<br />
DRM007<br />
BLDC Motor <strong>Co</strong>ntrol Board for Industrial and Appliance Applications<br />
58 Hardware Design <strong>Co</strong>nsiderations MOTOROLA
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