Pinouts and Pin Descriptions
Juno Step Motor Control IC User Guide
31
5
5.5
MC74113, MC74113N, MC75113,
MC75113N IC Pin Descriptions
The following table details the pinouts for the MC74113, MC74113N, MC75113, and MC75113N ICs.
Name
64-Pin
TQFP
Pin #
56-Pin
VQFN
Pin #
Direction Description
˜Reset
7
5
in/out
This pin is the master reset input. It may be temporarily
brought low to reset Juno to its initial conditions and then
restored to high for normal operation. During a power-on or
reset condition this pin is driven low by Juno. If this pin is
driven, it must be with an open drain output device.
For correct reset operation a 10k pull-up resistor should be
added between Reset and Vcc. In addition, a 100nF or smaller
capacitor is recommended between Reset and GND.
During power-up it is not necessary to provide a reset. Juno
generates an internal reset upon power-up.
PWMHighA/
PWMMagA
PWMLowA/
PWMSignA
PWMHighB
PWMLowB
PWMHighC/
PWMMagC
PWMLowC/
PWMSignC
PWMHighD
PWMLowD
56
55
54
53
51
50
39
38
49
48
47
46
45
44
34
33
out
Depending upon the output mode, these pins have the
following functions:
PWMHighA/B/C/D
signals encode the high side drive for a
switching bridge with separate high/low controls. The default
encoding is active high, however this can be changed using the
SetDrivePWM command.
PWMLowA/B/C/D
signals encode the low side drive for a
switching bridge with separate high/low controls. The default
encoding is active high, however this can be changed using the
SetDrivePWM command.
PWMMagA/C
signals encode the magnitude of a pulse width
modulated output for use with switching bridges with sign/
magnitude controls. The default encoding is active high,
however this can be changed using the SetDrivePWM
command.
PWMSignA/C
encode the sign of the pulse width modulated
output for use with switching bridges with sign/magnitude
controls. The default encoding is active high, however this
interpretation can be programmed.
AmplifierEnable
3
22
out
This pin provides an amplifier enable signal that may be useful
for some amplifier connection schemes. A high signal indicates
that amplifier output should be enabled and a low indicates
that amplifier output should be disabled.
˜Brake
37
32
in
This pin inputs a high speed PWM output disable that may be
useful for a braking function with some PWM amplifier
schemes. When low, PWM output is overridden to execute a
brake function or if so programmed, to be disabled. PWM
operation is normal when this signal is high.
˜Enable
2
1
in
This pin is an enable input. To allow normal operations a low
signal is asserted. When a high signal is asserted a
programmable response may disable motor control
operations, although communications and various other
operations are still available.
