AEK-MOT-SM81M1

AEK-MOT-SM81M1 Data brief Stepper motor driver evaluation board based on the L99SM81V for automotive applications Features • • • • • • • • • Board functionality based on L99SM81V programmable stepper motor driver for automotive applications: with micro-stepping and hold functions – – BEMF monitoring for stall detection – programmable configuration via SPI – 5 V internal linear voltage regulator (output available on board connector) Board reverse battery protection with STD95N4F3 MOSFET, which can be substituted with two optionally mounted diodes and a jumper Input operating voltage range from 6 V to 28 V Output current up to 1.35 A Board size: 65 mm length x 81 mm width x 11 mm maximum component height WEEE and RoHS compliant All ST components are qualified Automotive grade Part of the AutoDevKit™ initiative Applications: automotive bipolar stepper motor Description The AEK-MOT-SM81M1 evaluation board is designed to drive a bipolar stepper motor in micro-stepping mode, with coil voltage monitoring for stall detection. Product summary AutoDevKit stepper motor driver board for automotive applications AEK-MOT-SM81M1 programmable stepper motor driver L99SM81V for automotive applications Development environment SPC5-Studio addon for Eclipse (with AutoDevKit plugin extension) Suggested microcontroller SPC5 family MCUs This application board features the automotive-grade L99SM81V stepper motor driver with embedded power MOSFETs and a comprehensive set of I/Os for MCU control and feedback signaling using SPI communication through a 12-pin male connector or two 5-pin connectors on the board. The board is developed as part of the AutoDevKit initiative, and evaluation firmware is available for suitable microcontrollers such as the automotive-grade SPC5 series MCU on the AEK-MCU-C4MLIT1 control board. Automotive bipolar stepper motor; e.g.: Applications - adaptive vehicle front lighting systems - vehicle HUD projectors DB3986 - Rev 1 - July 2019 For further information contact your local STMicroelectronics sales office. www.st.com AEK-MOT-SM81M1 Overview 1 Overview The AEK-MOT-SM81M1 board targets automotive applications such as adaptive front lighting systems and HUD projectors, with stepping resolution ranging from 4 full steps to 64 micro steps for the finest possible positional control. The L99SM81V driver logically manages timers, counters, reference tables and mode or status registers that are read or set by the external microcontroller to drive the two coil phases of a bipolar stepper motor, with separate RUN and HOLD profiles for moving the rotor or keeping it stationary. Apart from supply voltage and driver current diagnostics, the driver also monitors the output voltages across the phase terminals in order to detect and flag critical motor stall events that can compromise motor operation and control. Figure 1. Car stepper motor application diagram RELATED LINKS Visit the Automotive Bipolar Stepper Motor page on the ST website for further relevant application and design information AutoDevKit: Adaptive Front Lighting demonstration kit video on YouTube DB3986 - Rev 1 page 2/5 Schematic diagrams Figure 2. AEK-MOT-SM81M1 schematic diagram 1K0 GND V3V_TP GND PGND GND 1 S STD95N4F3 T1 CPOUT TAB 22uF C3 VS_TP C5 4.7uF 17 PGND 100K GND 1 16 C4100nF C6 C7100nF C8 N.M. C10 12 N.M. B2 1 14 B1 2 7 A2 2 5 A1 C14 N.M. PGND 1 PGND R3 82K R4 CONB PHASE B CONA PHASE A PGND 22uF JP4 10 1K0 R5 10K VS_SENSE C15 100nF GND C13 N.M. GND 37 NC 1 34 R2 JP3 3 9 Vbat D3 STPS0540Z T2 2 BC847 3 C2 100nF PGND PSSO36/QFN40L/SOCKET PGND Connection to GND plane for heat sinking OUTA1 0R 5V5 CON Operating Range IDC(max)=50mA VDC=5V N.M. D G DOUT2 DOUT2 OUTA1 NC GND R16 PS CON Operating Range IDC(max)=3A VDC=6V-28V (40V transients) 27 DOUT1 DOUT1 28 CSN_F CSN CLK_F 30 SDI CLK OUTA2 PGND 1 29 SDO_F SDI_F 32 31 V3V 1 C21 N.M. SDO 35 100nF 100V OUTB1 GND CSN_F 1K0 OUTB2 VDD 33 25 GND C20 N.M. 24 C19 N.M. R15 CSN C12 VSA V5V NC GND 220nF D2 JP2 PGNDA 18 1K0 C18 N.M. R14 MOSI CLK_F 23 NC R13 C11 NC SCLK 19 100nF L99SM81V AOUT 1 1K0 SDO_F 220nF C9 1 R12 2 Vbat 100K VREG PGNDB 15 VSPI 100pF C0 GF1B N.M. R1 EN 13 PGND V5V D1 JP1 N.M. GND VSB NC 1 47K CTRL3 NC AOUT_TP 26 R9 VREG 11 CTRL3 22 AOUT 47K CTRL2 NC AOUT CTRL1 6 CTRL2 21 GND 8 CTRL1 20 VS_SENSE C1 C17 N.M. MOSI MISO SCLK CSN 254112WV054 MISO CP- EN 1K0 4 GND U1 36 R11 CP+ CP1 EN 1 2 3 4 5 6 7 8 9 10 11 12 1 VSPI R8 CP_TP CP+ GND VSPI 1 2 3 4 5 6 7 8 9 10 11 12 GND GND NC C16 4.7uF TLMY1000-GS08 GND DOUT1 DOUT2 EN R10 GND 1 D4 1K6 P1 DEVICE DIO_TP 1 2 3 4 5 6 7 8 Header 8 DB3986 - Rev 1 2 GND PGND OUTB1 1 1 OUTA2 1 GND 1 A2 OUTB2 1 B1 B2 GND R6 GND Vbat 2 Tr_d1 SMAJ40CA LED2 N.M. 1 CON V5V V5V 2 GND 5V Power Supply Output GND PGND PGND V5V_TP 1 2 3 4 5 SPI_TP 1 2 3 4 5 254105WV054 1 0R CSN SCLK MOSI MISO GND page 3/5 Schematic diagrams Power Supply R7 N.M. AEK-MOT-SM81M1 CON PS 1 AEK-MOT-SM81M1 Revision history Table 1. Document revision history DB3986 - Rev 1 Date Version 08-Jul-2019 1 Changes Initial release. page 4/5 AEK-MOT-SM81M1 IMPORTANT NOTICE – PLEASE READ CAREFULLY STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, enhancements, modifications, and improvements to ST products and/or to this document at any time without notice. Purchasers should obtain the latest relevant information on ST products before placing orders. ST products are sold pursuant to ST’s terms and conditions of sale in place at the time of order acknowledgement. Purchasers are solely responsible for the choice, selection, and use of ST products and ST assumes no liability for application assistance or the design of Purchasers’ products. No license, express or implied, to any intellectual property right is granted by ST herein. Resale of ST products with provisions different from the information set forth herein shall void any warranty granted by ST for such product. ST and the ST logo are trademarks of ST. For additional information about ST trademarks, please refer to www.st.com/trademarks. All other product or service names are the property of their respective owners. Information in this document supersedes and replaces information previously supplied in any prior versions of this document. © 2019 STMicroelectronics – All rights reserved DB3986 - Rev 1 page 5/5