NJM3775
■ PIN DESCRIPTION
SOP DIP PLCC Symbol Description
2 1 [8] M
B1
Motor output B, channel 1. Motor current flows from M
A1
to M
B1
when Phase
1
is HIGH.
32[10]E
1
Common emitter, channel 1. This pin connects to a sensing resistor R
S
to ground.
43[11]M
A1
Motor output A, channel 1. Motor current flows from M
A1
to M
B1
when Phase
1
is HIGH.
54[12]V
MM1
Motor supply voltage, channel 1, +10 to +40 V. V
MM1
and V
MM2
should be connected together.
6,7 5, 6, [1-3, 9, GND Ground and negative supply. Note: these pins are used thermally for heat-sinking.
18,19 17, 18 13-17, Make sure that all ground pins are soldered onto a suitably large copper ground plane
28] for efficient heat sinking.
87[18]V
R1
Reference voltage, channel 1. Controls the comparator threshold voltage and hence the output
current.
98[19]C
1
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.
10 9 [20] Phase
1
Controls the direction of motor current at outputs M
A1
and M
B1
. Motor current flows from M
A1
to
M
B1
when Phase
1
is HIGH.
11 10 [21] Dis
1
Disable input for channel 1. When HIGH, all four output transistors are turned off, which results
in a rapidly decreasing output current to zero.
12 11 [22] RC Clock oscillator RC pin. Connect a 12 kohm resistor to V
CC
and a 4 700 pF capacitor to ground
to obtain the nominal switching frequency of 23.0 kHz and a digital filter blanking time of 1.0µs.
13 12 [23] V
CC
Logic voltage supply, nominally +5 V.
14 13 [24] Dis
2
Disable input for channel 2. When HIGH, all four output transistors are turned off, which results
in a rapidly decreasing output current to zero.
15 14 [25] Phase
2
Controls the direction of motor current at outputs M
A2
and M
B2
. Motor current flows from M
A2
to
M
B2
when Phase
2
is HIGH.
16 15 [26] C
2
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.
17 16 [27] V
R2
Reference voltage, channel 2. Controls the comparator threshold voltage and hence the output
current.
20 19 [4] V
MM2
Motor supply voltage, channel 2, +10 to +40 V. V
MM1
and V
MM2
should be connected together.
21 20 [5] M
A2
Motor output A, channel 2. Motor current flows from M
A2
to M
B2
when Phase
2
is HIGH.
22 21 [6] E
2
Common emitter, channel 2. This pin connects to a sensing resistor R
S
to ground.
23 22 [7] M
B2
Motor output B, channel 2. Motor current flows from M
A2
to M
B2
when Phase
2
is HIGH.
Figure 2. Pin configurations
E
B2
B1
GND
RC
GND
GND
GND
GND
GND
GND
GND
GND
GND
5
6
7
8
9
10
11
25
24
23
22
21
20
19
4
3
2
1
28
27
26
12
13
14
15
16
17
18
V
R2
V
R1
V
CC
Phase
2
M
A2
2
Dis
M
M
1
Dis
A1
M
1
Phase
C
2
C
1
2
V
MM1
E
1
V
MM2
NJM3775FM2
1
2
3
4
5
6
7
8
9
10
11
22
21
20
19
18
17
16
15
14
13
12
C
R2
A1
GND
GND
1
R1
CC
M
V
M
GND
GND
Phase
Dis
RC
V
M
Phase
V
V
2
2
A2
MM2
B2
2
E
2
C
1
Dis
1
V
MM1
M
B1
E
1
NJM
3775D2
■ PIN CONFIGURATIONS
1
2
3
4
5
6
8
9
10
11
22
21
20
19
18
17
16
15
14
1312
GND
MA
1
Dis
1
MA
2
GND
NC
Phase
1
NJM
3775E3
MB
1
E
1
VMM
1
NC
MB
2
E
2
VMM
2
VR
1
VR
2
Dis
2
C
1
C
2
V
cc
RC
23
24
GND
GND
Phase
2
7
