Motorola M68HC08 - Manual (Page 68)

Hardware Design
Designer Reference Manual DRM028 — Rev 0
68 Hardware Design MOTOROLA
4.4.2 Optoisolation Board
Motorola’s embedded motion control series optoisolation board links
signals from a controller to a high-voltage power stage. The board
isolates the controller, and peripherals that may be attached to the
controller, from dangerous voltages that are present on the power stage.
The optoisolation board’s galvanic isolation barrier also isolates control
signals from high noise in the power stage and provides a noise-robust
systems architecture.
Signal translation is virtually one-for-one. Gate drive signals are passed
from controller to power stage via high-speed, high dv/dt, digital
optocouplers. Analog feedback signals are passed back through
HCNR201 high-linearity analog optocouplers. Delay times are typically
Table 4-2. Electrical Characteristics of Power Stage
Characteristic Symbol Min Typ Max Units
dc input voltage Vdc 140 160 230 V
ac input voltage Vac 100 208 240 V
Quiescent current I
CC
— 70 — mA
Min logic 1 input voltage V
IH
2.0 — — V
Max logic 0 input voltage V
IL
— — 0.8 V
Input resistance R
In
— 10 k
Ω
—
Analog output range V
Out
0 — 3.3 V
Bus current sense voltage I
Sense
— 563 — mV/A
Bus voltage sense voltage V
Bus
— 8.09 — mV/V
Peak output current I
PK
— — 2.8 A
Brake resistor dissipation
(continuous)
P
BK
— — 50 W
Brake resistor dissipation
(15 sec pk)
P
BK(Pk)
— — 100 W
Total power dissipation P
diss
— — 85 W
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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