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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

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

▫ 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

▫ Two LX7720 bi-level (comparator) outputs are routed to MCU QDEC TIO inputs for quadrature encoder use

▫ 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

• 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

▫ 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

▫ Two LX7720 bi-level (comparator) outputs are routed to MCU QDEC TIO inputs for quadrature encoder use

▫ 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

▫ All four LX7720 half-bridges are routable to the MCU PWM outputs, for BLDC and stepper compatibility

▫ 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

▫ 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

Product specificaties

Merk:	Microchip
Categorie:	Niet gecategoriseerd
Model:	LX7720

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