MPC17C724R2 FREESCALE [Freescale Semiconductor, Inc], MPC17C724R2 Datasheet - Page 8

• Manufacturer Part Number: MPC17C724R2
• Description: 0.4 A Dual H-Bridge Motor Driver IC
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

portable electronic applications to control bipolar step motors
and brush DC motors such as those used in camera lens and
shutters. The 17C724 can operate efficiently with supply
voltages as low as 2.7 V to as high as 5.5 V, and provide
continuous motor drive currents of 0.4 A while handling peak
currents up to 0.8 A. It is easily interfaced to low-cost MCUs
via parallel 3.0 V- or 5.0 V-compatible logic. The device can
be pulse width modulated (PWM’ed) at up to 200 kHz.
Figure
the simplified application diagram on
LOGIC CIRCUIT POWER SUPPLY (VDD)
the control (logic) circuit, and its input range is between 2.7 V
to 5.5 V (3.0 V and 5.0 V compatible). V
undervoltage threshold. If the supply voltage to V
below 2.0 V (typical), then all the output of H-Bridges
(OUT1A, OUT1B, OUT2A, OUT2B) will become open (high
impedance = Z). When the supply voltage returns to a level
that is above the threshold voltage the H-Bridge outputs
automatically resume normal operation according to the
established condition of the input terminals.
LOGIC INPUT CONTROL (IN1A, IN1B, IN2A, AND
IN2B)
For example, IN1A logic HIGH = OUT1A HIGH; likewise,
IN1B logic HIGH = OUT1B HIGH. If both A and B inputs are
HIGH, then both A and B outputs are Z (refer to
Table, page 7).
INPUT ENABLE CONTROL (PSAVE)
output stages (the H-Bridges). When it is set logic LOW, the
output stages are enabled and the H-Bridges function
normally. When it is set logic HIGH, the output stages are
disabled and all the outputs are opened (high impedance). In
8
17C724
FUNCTIONAL DESCRIPTION
INTRODUCTION
The 17C724 is a monolithic dual H-Bridge that is ideal in
The 17C724 can drive two motors simultaneously (see
The VDD terminal carries the power source connection to
These logic input terminals control each H-Bridge output.
The PSAVE input controls the functioning of the power
6), or it can drive one bipolar step motor as shown in
page 1.
FUNCTIONAL TERMINAL DESCRIPTION
DD
FUNCTIONAL DESCRIPTION
has an
Dual channel
Table 5, Truth
DD
drops
INTRODUCTION
parallel drive is also possible if higher current drive is desired
(0.8 A). Two-motor operation is accomplished by hooking
one motor between OUT1A and OUT1B, and the other motor
between OUT2A and OUT2B.
circuit and undervoltage detector to avoid malfunction. It also
allows for power-conserving Sleep mode by the setting of the
PSAVE terminal (refer to
Reverse, Brake, and Tri-Stated (High Impedance).
this mode, the built-in low-voltage detection circuit is
disabled.
H-BRIDGE OUTPUT (OUT1A, OUT1B, OUT2A, AND
OUT2B)
H-Bridges. OUT1 is from H-Bridge Channel 1, and OUT2
from H-Bridge Channel 2. These terminals will typically
connect to an external load (step motor or brush DC motors).
MOTOR DRIVER POWER SUPPLY (VM1 AND VM2)
into the power sections (the H-Bridges) of the IC. Both of
these terminals are connected internally but they must be
connected together on the printed circuit board with as short
as possible traces. The input range is 2.7 V to 5.5 V.
POWER GROUND (PGND1 AND PGND2)
the power ground of the H-Bridges. The power grounds are
for higher current handling capability from loads and they
must be connected together on the PCB.
LOGIC GROUND (LGND)
level is lower than the PGND.
This IC has a built-in shoot-through current protection
The device features four operating modes: Forward,
These terminals are the outputs of the power MOSFET
VM1 and VM2 carries the main supply voltage and current
These two are the power ground terminals that connect to
LGND is the logic ground terminal and its current handling
Analog Integrated Circuit Device Data
Table 5, Truth
Freescale Semiconductor
Table, page 7).