NJU39610
DA
1
and DA
2
These are the two outputs of DAC1 and DAC2. Input to the DACs are internal data bus (Q
61
… Q
01
) and (Q
62
…
Q
02
).
Reference Voltage V
Ref
V
Ref
is the analog input for the two DACs. Special care in layout, gives a very low voltage drop from pin to resistor.
Any V
Ref
between 0.0 V and V
DD
can be applied, but output might be non-linear above 3.0 V.
Power-on Reset
This function automatically resets all internal flip flops at power-on. This results in V
SS
voltage at both DAC outputs
and all digital outputs.
Reset
If Reset is not used, leave it disconnected. Reset can be used to measure leakage currents from V
DD
.
Time when motor is in
a compromise
position.
Time when micro
position is correct.
Write
signal.
Motor
position.
Writing to
channel 1.
Writing to
channel 2.
Time
Ideal data = desired position
Write time = incorrect position
Useful time = correct
position
Double pulse write signal
Actual data = true position
Normal resolution
Figure 9. Double pulse programming, in- and output signals.
Time when motor is in
an intermediate
position.
Time when micro
position is almost
correct.
Write
signal.
Motor position. Note
that position is always
a compromise.
Writing to
channel 1.
Writing to
channel 2.
Time
Useful time = compromise position
with equally spaced angles
Useful time = almost
correct position
Single pulse write signal
"Ideal data" = desired
position
Actual data = true position
Note increased resolution
Figure 10. Single pulse programming, in- and output signals.
NJRC [ NEW JAPAN RADIO ]
