M54679FP Просмотр технического описания (PDF) - Renesas Electronics

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производитель

M54679FP

2-Phase Stepper Motor Driver

Renesas Electronics 

M54679FP

Function Explanation

1. Ph inputs make a decision the output function.

Ph*A

Ph*B

Out*A

L

L

OFF

H

L

H

L

H

L

H

H

OFF

* : 1 or 2

The outputs shut off under Ph*A and Ph*B High condition at the same time.

Out*B

OFF

L

H

OFF

2. Output current and terminal of output current setting.

I0

I1

Output current ratio

L

L

100%

H

L

70%

L

H

30%

H

H

0%

Current sensing comparators

threshold voltage (Vref=5V)

500mV

350mV

155mV



3. Equivalent circuit of Vref terminal.

The equivalent circuit of Vref terminal is shown in right circuit.

As Vref terminal needs typical 500µA input current, consider this value when Vref voltage is set.

4. Current sensing comparators.

The current sensing comparators compare the voltage (VRs) of current sensing resistor and threshold voltage (VCH) of

this comparators, then if VRs > VCH, the comparators output change and shut off the output.

Vref

18k

3.5k 0.68k

2k

I0

I1

Rev.1.0, Sep.19.2003, page 6 of 12

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