NJU39610D2 NJR, NJU39610D2 Datasheet - Page 4

• Manufacturer Part Number: NJU39610D2
• Description: IC STEPPER MOTOR DUAL/DAC 22-DIP
• Manufacturer: NJR
• Type: Micro Stepping Motor Controller with Dual DACr

Specifications of NJU39610D2

• Applications: Stepper Motor Controller
• Number Of Outputs: 1
• Voltage - Supply: 4.75 V ~ 5.25 V
• Operating Temperature: -20°C ~ 85°C
• Mounting Type: Through Hole
• Package / Case: 22-DIP (0.400", 10.16mm)
• Product: Stepper Motor Controllers / Drivers
• Operating Supply Voltage: 4.75 V to 5.25 V
• Supply Current: 0.4 mA
• Mounting Style: Through Hole
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Current - Output: -
• Voltage - Load: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Data Bus Interface
NJU39610 is designed to be compatible with 8-bit microprocessors such as the 6800, 6801, 6803, 6808, 6809,
8051, 8085, Z80 and other popular types and their 16/32 bit counter parts in 8 bit data mode. The data bus inter-
face consists of 8 data bits, write signal, chip select, and two address pins. All inputs are TTL-compatible (except
reset). The two address pins control data transfer to the four internal D-type registers. Data is transferred according
to figure 10 and on the positive edge of the write signal.
Current Direction, Sign
These bits are transferred from D
the data transfer table in figure 10.
Current Decay, CD
CD
is strictly larger than the new value of DA-Data1 and the value of the level register LEVEL1 (L
larger than the new value of DA-Data1. CD
The logic definition of CD
CD
Where (D
the three bits for setting the current decay level at LEVEL1.
CD
Where (L
old values of DA-Data2.
three most significant bits of the DA-Data value, sign bit excluded.
Figure 6a. Assuming that torque is
proportional to the current in resp.
winding it is possible to draw figure
8b.
The logic definition of CD
The two level registers, LEVEL1 and LEVEL2, consist of three flip flops each and they are compared against the
1
1
2
I [mA]
2
and CD
= NOT{[(D
= NOT{[(D
62
6
… D
… L
2
are two active low signals (LOW = fast current decay). CD
6
6
0
42
) is the new value being sent to DA-Data1 and (Q
… D
… D
) is the level programmed in channel 2’s level register. (D
I
Figure 8. Table showing how data is transfered inside NJU39610.
1
0
0
& CD
) < (Q
) < (Q
CS
0
0
0
0
1
1
1
& Sign
is:
2
2
61
62
is analog to CD
… Q
… Q
A0
I [mA]
0
0
1
1
X
1
2
7
01
02
when writing in the respective DA register. A
)] AND[(D
)] AND[(D
A1
X
0
1
0
1
Figure 6b. An example of accessible
positions with a given torque devia-
tion/fullstep. Note that 1:st step
sets highest resolution. Data points
are exaggerated for illustration
purpose.
TNom = code 127.
T
T
T
nom
max
min
Data Transfer
No Transfer
1
D7 —> Sign1, (D6—D0) —> (Q61—Q01), New value —> CD1
D7 —> Sign2, (D6—D0) —> (Q62—Q02), New value —> CD2
1
is updated every time a new value is loaded into DA-Data1.
T
:
2
6
6
…D
…D
[mNm]
4
4
) < (L
) < (L
(D6—D4) —> (L61—L41)
(D6—D4) —> (L62—L42)
61
62
… L
… L
41
42
)]}
)]}
61
… Q
T
1
[mNm]
1
01
is active if the previous value of DA-Data1
) is DA-Data1’s old value. (L
6
… D
0
Figure 7. Motor current dragging at
high step rates and current decay
influence. Fast current decay will
make it possible for the current to
follow the ideal sine curve. Output
shown without sign shift.
and A
0
) and (Q
DA output [V]
CD
1
must be set according to
62
… Q
61
NJU39610
… L
02
) are the new and
41
Current dragging
) is strictly
61
Time
… L
t
41
) are