Microchip LX7720 Bedienungsanleitung


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© 2023 Microchip Technology Inc. LX7720MLF Evaluation Board User Guide rev 1.2 - page 1
LX7720MLF Evaluation Board User Guide
Description
The LX7720MLF evaluation board (EVB) contains a soldered in place LX7720MLF and peripherals to allow LX7720
functionality to be quickly evaluated. Demonstration firmware is available for RTG4 FPGAs and SAM rad hard MCUs.
The LX7720MLF EVB uses a 40-way header for connection to FPGA or MCU controllers. The kit includes linker boards
for direct plug-in connection to an RTG4 FPGA FPGA DEV-KIT, an RT PolarFire FPGA RTPF-DEV-KIT, a PolarFire
MPF300-EVAL-KIT, a SmartFusion2 SoC FPGA M2S150-ADV-DEV-KIT, a SAMRH71F20 MCU Evaluation Kit and
SAMRH71-TFBGA-EK Evaluation Kit, and a SAMRH707F18 MCU Evaluation Kit.
Kit Contents
• LX7720MLF evaluation board with soldered-in-place LX7720MLF production part
• 24V 1.5A universal input AC adapter with 2.1mm x 5.5mm DC output connector, centre positive
• 2-position 5mm pitch terminal block socket type B, Molex 0395237002 or equivalent, to mate PL2
• 4-position 5mm pitch terminal block socket type B, Molex 0395237004 or equivalent, to mate PL_MOTOR
• FMC-HPC Linker adaptor to connect to various FPGA evaluation boards as listed above
• Linker board to connect to a SAMRH71F20-EK evaluation kit, plus a board with control switches and LEDs
• Linker board to connect to a SAMRH71-TFBGA-EK evaluation kit (which can also use the switch/LED board)
• Linker board to connect to a SAMRH707F18-EK evaluation kit, with LC filters for optional ∆Σ stream processing
• A bipolar 7.5°/step stepper motor for test purposes, mounted with ballast resistors for 24V operation (140Ω/phase)
• 4x 6mm, 4x 7mm nylon standoffs and 4x nuts for linker board height matching
• USB stick with documentation (see section 2 on page 4)
Ordering Information
Product Order Number
LX7720MLF Evaluation Board LX7720MLF-DB
Figure 1. LX7720MLF Evaluation Board
LX7720MLF Evaluation Board User Guide
Linker Adaptors to FPGA and MCU Evaluation Boards
© 2023 Microchip Technology Inc. LX7720MLF Evaluation Board User Guide rev 1.2 - page 2
1 Linker Adaptors to FPGA and MCU Evaluation Boards
The LX7720MLF EVB provides a 2x20 pin 0.1" pitch pin header, PL20, which provides 3.3V logic level control signals to
and from an external MCU controller or FPGA. Section 5 on page 21 details PL20's pinout, whic h is different to that used
by J20 on the LX7720-DB. The pinout was modified from that used by the LX7720-DB's PL20 to make the routing for
high-speed logic connections as direct as possible to the LX7720's pins.
The LX7720MLF EVB includes linker adaptors for direct interconnection to FPGA and MCU controller boards:
• The FMC-HPC linker (section 6 on page 23) routes PL20 signaling to a develop ment board with an HPC-FMC (High
Pin Count FPGA Mezzanine Card) connector. The pinout is provided in Table 7 on page 24 and Table 8 on page 25.
Pinouts and FPGA resource allocations are provided for the following FPGA boards' HPC1-FMC connector:
 The RTG4 FPGA DEV-KIT (Table 9 on page 26)
 The PolarFire FPGA MPF300-EVAL-KIT (Table 9 on page 26)
 The RT PolarFire FPGA RTPF-DEV-KIT (Table 10 on page 27)
 The SmartFusion2 SoC FPGA M2S150-ADV-DEV-KIT (Table 11 on page 28)
Figure 2. RTG4 DEV_KIT using FMC-HPC Linker to Connect to LX7720MLF EVB
• The SAMRH71-EK linker (section 7 on page 30) routes PL20 signaling to a SAMRH71F20-EK evaluation kit for the
SAMRH71F20 MCU. Table 14 on page 31 provides the pinout and MCU resource allocation. The kit comprises a
linker board which connects a SAMRH71F20-EK to the LX7720MLF-EVB, a small board with switches, and a ribbon
cable:
 The linker board connects signals from the SAMRH71F20-EK's 0.1" headers J24 and J30 to PL20
â–« All four LX7720 half-bridges are routed to the MCU PWM outputs, for BLDC and stepper compatibility
▫ 3 of the 4 motor phase current ∆Σ serial streams (SNS_OUT_A, B, and C) are routed to MCU TCLK inputs
â–« Two LX7720 bi-level (comparator) outputs are routed to MCU QDEC TIO inputs for quadrature encoder use
â–« The resolver/LVDT transformer primary differential drive (DMOD_IN_P, DMOD_IN_N) and associated ADC
Σ-Δ modulators ADC1, ADC2, and ADC3 are not routed to the MCU, but brought out to test point holes
 The switch board connects to GPIOs on SAMRH71F20-EK's 0.1" header J25 via a 20 way ribbon cable. The
SAMRH71F20 optionally uses GPIOs to monitor five push switches and operate two LEDs as status indicators
Figure 3. SAMRH71-EK using SAMRH71-EK Linker to Connect to LX7720MLF EVB
LX7720MLF Evaluation Board User Guide
Linker Adaptors to FPGA and MCU Evaluation Boards
© 2023 Microchip Technology Inc. LX7720MLF Evaluation Board User Guide rev 1.2 - page 3
• The SAMRH71-TFBGA-EK linker (section 7 on page 30) routes PL20 signaling to a SAMRH71-TFBGA-EK
evaluation kit for the SAMRH71F20 MCU. The same signals are routed as for the SAMRH71-EK linker discussed
above:
 The linker board connects signals from the SAMRH71-TFBGA-EK's 0.1" headers J5 and J7 to PL20
â–« All four LX7720 half-bridges are routed to the MCU PWM outputs, for BLDC and stepper compatibility
▫ 3 of the 4 motor phase current ∆Σ serial streams (SNS_OUT_A, B, and C) are routed to MCU TCLK inputs
â–« Two LX7720 bi-level (comparator) outputs are routed to MCU QDEC TIO inputs for quadrature encoder use
â–« The resolver/LVDT transformer primary differential drive (DMOD_IN_P, DMOD_IN_N) and associated ADC
Σ-Δ modulators ADC1, ADC2, and ADC3 are not routed to the MCU, but brought out to test point holes
 The switch board connects to GPIOs on SAMRH71-TFBGA-EK 0.1" header J9 via a 20 way ribbon cable.
Figure 4. SAMRH71- TFBGA-EK using SAMRH71- TFBGA-EK Linker to Connect to LX7720MLF EVB
• The SAMRH707-EK linker (section 8 on page 36) routes PL20 signaling to a SAMRH707-EK evaluation kit for the
SAMRH707F18 MCU. Table 11 on page 38 provides the pinout and MCU resource allocation.
 The linker board connects signals from SAMRH707-EK 0.1" headers J18, J19, and J20 to PL20
â–« All four LX7720 half-bridges are routable to the MCU PWM outputs, for BLDC and stepper compatibility
â–« The resolver/LVDT transformer primary differential drive (DMOD_IN_P, DMOD_IN_N) is routable to the 4th
pair of MCU PWM outputs instead of the 4th LX7720 half-bridge. This eases operation of either a 3-phase
BLDC plus resolver/LVDT, or a bipolar stepper motor without resolver/LVDT without external wiring
▫ 3 of the 4 motor phase current ∆Σ serial streams (SNS_OUT_A, B, and C) are routed to MCU TCLK inputs
▫ All 4 phase current ∆Σ serial streams (SNS_OUT_A x) and the 3 resolver/LVDT Σ-Δ serial streams (ADCx)
are processed on the linker board by RLC passive filters ((Figure 44 on page 36). This allows any of the
LX7720's ∆Σ serial streams to be acquired by MCU ADC channels instead of by DSP firmware
â–« Two LX7720 bi-level (comparator) outputs are routed to MCU QDEC TIO inputs for quadrature encoder use
Figure 5. SAMRH707-EK using SAMRH707-EK Linker to Connect to LX7720MLF EVB


Produktspezifikationen

Marke: Microchip
Kategorie: Nicht kategorisiert
Modell: LX7720

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