NJM37770
-
-
Ver.2006-04-11
■ PIN CONFIGURATION
Figure 2. Pin configuration
■ PIN DESCRIPTION
DIP EMP Symbol Description
1 1 M
B
Motor output B, Motor current flows from M
A
to M
B
when Phase is high.
2 2 T Clock oscillator. Timing pin connect a 56 kΩ resistor and a 820 pF in parallel between T and
Ground.
3,14 3,18 V
MM
Motor supply voltage, 10 to 40 V. Pin 3 and pin 14(EMP pin 18) should be wired to gether.
4,5,
12,13
4-7
14-17
GND Ground and negative supply. Note these pins are used for heatsinking.
Make sure that all ground pins are soldered onto a suitable large copper ground plane for
efficient heat sinking.
6 8 V
CC
Logic voltage supply normally +5 V.
7 9 I
1
Logic input. It controls, together with the I0 input, the current level in the output stage.
The controllable levels are fixed to 100, 60, 20, 0%.
8 10 Phase Controls the direction of the motor current of M
A
and M
B
outputs.
Motor current flows from M
A
to M
B
when the phase input is high.
9 11 I
0
Logic input. It controls, together with the I
1
input, the current level in the output stage.
The controllable levels are fixed to 100, 60, 20, 0%.
10 12 C Comparator input. This input senses the instantaneous voltage across the sensing resistor,
filtered through a RC Network.
11 13 V
R
Reference voltage. Controls the threshold voltage of the comparator and hence
the output current. Input resistance: typically 6.8 kΩ ±20%.
15 19 M
A
Motor output A, Motor current flows from M
A
to M
B
when Phase is high.
16 20 E Common emitter. Connect the Sense resistor between this pin and ground.
