Motorola M68HC08 - Manual (Page 69)

Hardware Design
High-Voltage Hardware Set Components
DRM028 — Rev 0 Designer Reference Manual
MOTOROLA Hardware Design 69
250 ns for digital signals, and 2
µs for analog signals. Grounds are
separated by the optocouplers’ galvanic isolation barrier.
Both input and output connections are made via 40-pin ribbon cable
connectors. The pin assignments for both connectors are the same. For
example, signal PWM_AT appears on pin 1 of the input connector and
also on pin 1 of the output connector. In addition to the usual motor
control signals, an MC68HC705JJ7CDW serves as a serial link, which
allows controller software to identify the power board.
Power requirements for controller side circuitry are met with a single
external 12-Vdc power supply. Power for power stage side circuitry is
supplied from the power stage through the 40-pin output connector.
4.4.2.1 Electrical Characteristics of the Optoisolation Board
The electrical characteristics in Table 4-3 apply to operation at 25
°C,
and a 12-Vdc power supply voltage.
Table 4-3. Electrical Characteristics
Characteristic Symbol Min Typ Max Units Notes
Power Supply Voltage Vdc 10 12 30 V
Quiescent Current I
CC 70
(1)
200
(2)
500
(3) mA dc/dc converter
Min Logic 1 Input Voltage V
IH
2.0 — — V HCT logic
Max Logic 0 Input Voltage V
IL
— — 0.8 V HCT logic
Analog Input Range V
In
0 — 3.3 V
Input Resistance R
In
— 10 — k Ω
Analog Output Range V
Out
0 — 3.3 V
Digital Delay Time t
DDLY
— 0.25 — µs
Analog Delay Time t
ADLY
— 2 — µs
1. Power supply powers optoisolation board only.
2. Current consumption of optoisolation board plus DSP EMV board (powered from this power supply)
3. Maximum current handled by dc/dc converters
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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