Microsemi LX7720 User Manual

LX7720 Daughter Board User's Manual
Introduction
The LX7720 provides four half-bridge drivers with floating current sense for motor coil driving, six bi-level inputs for
position sensing, and a resolver to digital interface with primary coil driver. The LX7720 supports a ground potential
difference between the motor and signal grounds of up to 10V and motor supply voltages up to 60V.
When used with an FPGA or MCU controller, the LX7720 provides a complete open- or closed-loop motor driver with coil
current feedback and rotation or linear position sensing for stepper motors, brushless DC and permanent magnet motors.
Position sensing supports encoders, hall sensors, resolvers, synchros, and LVDTs. Resolver carrier frequencies from
360Hz to 20kHz are supported. FPGA IP modules are available to support motor driving functions from open loop cardinal
step driving to space vector modulation using field oriented control.
The LX7720 contains 7 sigma delta modulators for analog acquisition. Sinc filtering and decimation is performed in the
FPGA or MCU controller. Four modulators sample the voltage across floating current sense inputs. The remaining three
modulators sample differential analog inputs such as the filtered drive waveform and output waveforms of a resolver.
The LX7720 daughter board uses an FMC connector for plug-in connection to the
PolarFire FPGA MPF300-EVAL-KIT
signals for connection to other boards such as the
MCU Evaluation Kit (Figure 4 on page 2), and the
Kit Contents
•
LX7720 evaluation board SOL-12-000003-11 with soldered-in-place LX7720-ES engineering sample
•
Engineering sample (-ES marking suffix) explanation sheet
•
24V 1.5A universal input AC adapter
•
20x 0.1" pitch shorting jumpers
•
4x 2-position 5mm pitch terminal block sockets, EB9A-02-C or equivalent to mate J12, J18, J30, and J31
•
4-position 5mm pitch terminal block sockets, OSTTJ047150 or equivalent, to mate J9
•
3-position Molex 50-57-9403 2.54mm pitch wire housing latching header to mate J13
•
6-position Molex 50-57-9406 2.54mm pitch wire housing latching header to mate J14
•
8-position Molex 50-57-9408 2.54mm pitch wire housing latching header to mate J15
•
20x Molex 16-02-0096 crimp sockets to suit 24 - 30AWG wire, for J13, J14, and J15 housings
•
USB stick with documentation (see section 1 on page 3)
Figure 1. LX7720 Daughter Board Connected to
June 2020
© 2020 Microsemi Corporation
LX7720 Daughter Board User's Manual
(Figure 2 on page 2) development boards. A 40-way header provides the same
ProASIC3 FPGA
SAMV71Q21RT
RTG4 DEV-KIT
LX7720 Daughter Board rev 2.1
RTG4 FPGA
Starter Kit (Figure 3 on page 2), the
MCU SAM V71 Xplained evaluation
using the FMC Connector
Production Datasheet
DEV-KIT (Figure 1) and
SAMRH71F20
kit.
1