Stepper motor interface signal summary | Arm Enterprises IM-AD1

Hardware Reference

The current limit is set by the reference voltage and sense resistor according to the equation:

Ipeak =

Vref

Rsense

Therefore, with a 0.1Ω sense resistor fitted:

Ipeak = 0.15 x 10 = 1.5A

The reference voltage, and therefore the current limit, can be adjusted by altering the values of the divider resistors. Although the DC current switching limit of L298 is 2A, due to the power dissipation limit of the device and the heatsink, the maximum load current for each stepper winding is 1.5A. The L298 can switch drive voltages up to 46V.

Warning

The L298 devices, U24 and U26, and their heatsinks are very hot when high load currents are used.

3.5.2Stepper motor interface signal summary

Table 3-6 shows the assignment of the stepper motor interface signals to the logic module signals on the EXPB connector.

			Table 3-6 Stepper motor interface signals

	Signal	EXPB	Description
	Signal	connector	Description
		connector

	STEP1_ENA	F0	Enable signal for STEP1_O1 and STEP1_O2

	STEP1_ENB	F1	Enable signal for STEP1_O3 and STEP1_O4

	STEP1_PH1	F2	Step1 phase 1 drive signal

	STEP1_PH2	F3	Step1 phase 2 drive signal

	STEP1_PH3	F4	Step1 phase 3 drive signal

	STEP1_PH4	F5	Step1 phase 4 drive signal

	STEP2_ENA	F6	Enable signal for STEP2_O1 and STEP2_O2

	STEP2_ENB	F7	Enable signal for STEP2_O3 and STEP2_O4

ARM DUI 0163B

Copyright © 2001-2003. All rights reserved.

3-9

Image 33

Arm Enterprises IM-AD1 manual Therefore, with a 0.1Ω sense resistor fitted, Stepper motor interface signal summary

Contents

Integrator/IM-AD1 User Guide Integrator/IM-AD1 Conformance Notices Copyright 2001-2003. All rights reserved Chapter Introduction Integrator/IM-AD1 User Guide Appendix a Signal Descriptions Preface Using this book About this bookIntended audience Typographical conventions Further readingARM publications Third-party documents Feedback Feedback on this documentFeedback on the Integrator/IM-AD1 Xii Introduction ARM DUI 0163B About the Integrator/IM-AD1 Integrator/IM-AD1 layout Features Interface module features and architecture Architecture Integrator/IM-AD1 block diagram Links and LEDs Config LED Care of modules Introduction Copyright 2001-2003. All rights reserved Getting Started Assembled Integrator development system Fitting the interface module Switch 2 Closed Switch 3 Open Switch 4 Open Setting up the logic module Running the test software Hardware Reference Hardware Reference Connector Serial interface signal assignment Signal nameUart interface Description Serial connector signal assignment Pin J18 Type Description Serial connector pinout SPI SPI signals Signal PWM interface PWM interface signals Signal PWM connector signals Pin J14 J10 Description Shows the signal assignment Functional description Stepper motor interface Therefore, with a 0.1Ω sense resistor fitted Stepper motor interface signal summary Stepper motor interface signals Stepper motor connectors VSS Stepper motor connector signals Pin J19 J23 Description Gpio Gpio connectors J16 and J17 Hardware Reference Can interface U13Buffer Can interface signal assignment Signal IMBBANK28 IMBBANK29IMBBANK30 GND Can connector signal assignments Pin 10 ADC and DAC interface architecture ADC and DAC interfaces IMABANK49 IMABANK48IMABANK50 IMABANK51 11shows the pinout of the ADC interface connector J1 12 shows the pinout of the DAC interface connector J2 Hardware Reference Copyright 2001-2003. All rights reserved Reference Design Example About the design example About PrimeCellsExample architecture File Description Vhdl file descriptions Example memory map Integrator system memory map Address assignment of logic modules Integrator/IM-AD1 memory map Logic module addresses Position Bits StackIntegrator/IM-AD1 memory map Device Address Gpioa StepperbGpiob Ssram Example APB register peripheral Logic module registersOffset address Name Type Function Oscillator divisor registers LMOSCx registers Bits Name Access Function RDWVDW Oscillator lock register Bits Name Access FunctionUser LEDs control register Push button interrupt register Switches register Uart SPICS2 SPI chip select registerSPICS1 SPICS0 Synchronous serial port PWM controller Stepper motor peripheral Offset Name Access Function AddressCont Count Stepper x control register Docount SinglestepDIR Stepx speed register Stepx count register Address offset Name Access Size Function Read data output pinsData output set register Read data input register Gpio direction control 1 bit Data direction Ssram interface Interrupt sources Vectored interrupt controllerInterrupt Interrupt source Source number CAN1 Reference Design Example Canreset Can reset control registerCan controller interface CANxBase 16 ADC and DAC interface registers ADC and DAC interfaceAdcstatus ADC2BUSY Peripheral information block 18 PIB entry formatBits Name Function Signal Descriptions Expa Pin label Signal Description Table A-1 AHB signal assignment Expb Pin label Name Description Table A-2 Expb signal description Expim Table A-3 Expim signal descriptions LabelLM-EP20K1000E Description Figure A-4 J7 pin locations Logic analyzer connector CLK1 Table A-4 J7 connector pinout Signal Pin Multi-ICE Jtag Figure A-5 Multi-ICE connector pinout Mechanical Specification Mechanical information Figure B-1 Board dimensions top view Figure B-2 Bottom board dimensions viewed from top side Connector reference DB9DUALDB9STRAIGHT FCI Multi-ICE Glossary Synchronous Serial Port ADC Can IndexDAC Gpio Expa A-2 Gpiodataclr Gpiodatain Gpiodataout Gpiodataset GpiodirnLmleds Lmlock LMOSC1