NJM3777 New Japan Radio, NJM3777 Datasheet - Page 2

• Manufacturer Part Number: NJM3777
• Description: DUAL STEPPER MOTOR DRIVER
• Manufacturer: New Japan Radio

Figure 2. Pin configuration
EMP
1
2
3
4
5
6, 7,
18, 19
8
9
10
11
12
13
14
15
16
17
20
21
22
23
24
PIN CONFIGURATION
PIN DESCRIPTION
Symbol
NC
M
E
M
V
GND
V
C
Phase
Dis
RC
V
Dis
Phase
C
V
V
M
E
M
NC
1
MM1
R1
CC
R2
MM2
2
1
2
B1
A1
A2
B2
1
2
1
2
Description
Not connected
Motor output B, channel 1. Motor current flows from M
Common emitter, channel 1. This pin connects to a sensing resistor R
Motor output A, channel 1. Motor current flows from M
Motor supply voltage, channel 1, +10 to +40 V. V
Ground and negative supply. Note: these pins are used thermally for heat-sinking.
Make sure that all ground pins are soldered onto a suitably large copper ground plane for efficient heat -
sinking.
Reference voltage, channel 1. Controls the comparator threshold voltage and hence the output current.
Comparator input channel 1. This input senses the instantaneous voltage across the sensing resistor,
filtered by the internal digital filter or an optional external RC network.
Controls the direction of motor current at outputs M
Phase
Disable input for channel 1. When HIGH, all four output transistors are turned off, which results in a
rapidly decreasing output current to zero.
Clock oscillator RC pin. Connect a 12 kohm resistor to V
the nominal switching frequency of 23.0 kHz and a digital filter blanking time of 1.0 s.
Logic voltage supply, nominally +5 V.
Disable input for channel 2. When HIGH, all four output transistors are turned off, which results in a
rapidly decreasing output current to zero.
Controls the direction of motor current at outputs M
Phase
Comparator input channel 2. This input senses the instantaneous voltage across the sensing resistor,
filtered by the internal digital filter or an optional external RC network.
Reference voltage, channel 2. Controls the comparator threshold voltage and hence the output current.
Motor supply voltage, channel 2, +10 to +40 V. V
Motor output A, channel 2. Motor current flows from M
Common emitter, channel 2. This pin connects to a sensing resistor R
Motor output B, channel 2. Motor current flows from M
Not connected
1
2
is HIGH.
is HIGH.
Phase
VMM
GND
GND
MB
MA
Dis
VR
RC
NC
C
E
1
1
1
1
1
1
1
1
12
10
11
6
1
2
3
4
5
7
8
9
3777E3
NJM
MM1
MM1
A1
A2
and V
and V
and M
and M
A1
A1
A2
A2
19
18
15
13
24
23
22
21
20
17
16
14
to M
to M
to M
to M
NC
CC
MB
E
MA
VMM
GND
VR
C
Phase
Dis
V
GND
2
cc
MM2
MM2
2
and a 4 700 pF capacitor to ground to obtain
B1
B2
2
2
2
2
B1
B1
B2
B2
. Motor current flows from M
. Motor current flows from M
2
should be connected together.
should be connected together.
2
when Phase
when Phase
when Phase
when Phase
S
S
to ground.
to ground.
1
1
2
2
is HIGH.
is HIGH.
is HIGH.
is HIGH.
NJM3777
A1
A2
to M
to M
B1
B2
when
when