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Electrical characteristics – Motorola M68HC08 User Manual

Page 69

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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

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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