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PDF NJU39610 Data sheet ( Hoja de datos )
| Número de pieza | NJU39610 | |
| Descripción | MICROSTEPPING MOTOR CONTROLLER WITH DUAL DAC | |
| Fabricantes | New Japan Radio | |
| Logotipo |  |
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NJU39610
MICROSTEPPING MOTOR CONTROLLER WITH DUAL DAC
s GENERAL DESCRIPTION
NJU39610 is a dual 7-bit+sign, Digital-to-Analog Converter
(DAC) especially developed to be used together with the
NJM3771, Precision Stepper Motor driver in micro-stepping
applications. The NJU39610 has a set of input registers
connected to an 8-bit data port for easy interfacing directly to
a microprocessor. The NJU39610 is well suited for high-
speed micro-stepping application.
s PACKAGE OUTLINE
NJU39610D2
NJU39610FM2
s FEATURES
• Analog control voltages from 3 V down to 0.0 V
• High-speed microprocessor interface
• Automatic fast/slow current decay control
• Full-scale error
• Fast conversion speed
±1 LSB
3 µs
• Matches NJM3771
• Packages
DIP22/PLCC28
s BLOCK DIAGRAM
WR
CS
A0
A1
D7 - D0
RESET
Figure 1. Block Diagram
VDD
VRef
POR
DA- Data 1
E
C
D
E1 R
Level 1
E
E2
C
D
R
Level 2
E3 E
C
D
E4 R
DA- Data 2
E
C
D
R
R
Digit
Comp
E1 E
C
D
R
E4 E
Digit
Comp C
D
R
Vss
NJU39610
Sign 1
D/A
CD1
DA 1
D/A
DA 2
CD2
Sign 2
1 page  
NJU39610
DA1 and DA2
These are the two outputs of DAC1 and DAC2. Input to the DACs are internal data bus (Q61 … Q01) and (Q62 …
Q02).
Reference Voltage V
Ref
V is the analog input for the two DACs. Special care in layout, gives a very low voltage drop from pin to resistor.
Ref
Any VRef between 0.0 V and VDD 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 VSS 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 VDD.
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.
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.
Useful time = compromise position
with equally spaced angles
Useful time = almost
correct position
Single pulse write signal
"Ideal data" = desired
position
Figure 10. Single pulse programming, in- and output signals.
Time
Ideal data = desired position
Time
Actual data = true position
Note increased resolution
5 Page 
Counter
Clock Up/Dn
PROM
D0-D7
CE
NJU39610
A0
WR
CS
A1 Vref
Step
Direction
Control Logic
Voltage
Reference
NJU39610
NJM3771
Figure 13. Typical blockdiagram of an application without a microprocessor.
VCC (+5 V)
0.1 µF
0.1 µF
V MM
+
10 µF
To
µP
+2.5V
14
D0
5
VDD
7 D7
NJU39610
15 A0
16 A1
6
17
22
WR
CS
1 RESET
V Ref
VSS
18
GND
(VCC )
11 3
20
Sign1
CD1
DA1
Sign2
CD2
DA2
3
7
V CC
Phase 1
V MM1
V MM2 MA1
4 8 CD1
2 9 VR1
MB1
NJM3771
20
16
Phase 2
MA2
19 15 CD2
21 14 V R2
MB2
RC GND C1
E1 C2
E2
12 5, 6, 10 2 13
21
+5 V 15 kΩ
17, 18
1 kΩ
1 kΩ
4
1
19
22
3 300 pF
820 pF
1.0 Ω
820 pF
R S 1.0 Ω
RS
STEPPER
MOTOR
Pin numbers refer
to DIP package.
GND (VMM)
Figure 14. Typical application in a microprocessor based system.
The specifications on this databook are only
given for information , without any guarantee
as regards either mistakes or omissions. The
application circuits in this databook are
described only to show representative usages
of the product and not intended for the
guarantee or permission of any right including
the industrial rights.
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet NJU39610.PDF ] | |
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