PWM controller | Arm Enterprises IM-AD1 specification

Reference Design Example

4.6PWM controller

The PWM control function is implemented by the DC-DC converter PrimeCell (PL160). Refer to the ARM PrimeCell DC-DC Converter Interface (PL160) Technical Reference Manual for information about this device.

The DC-DC PrimeCell uses the 4MHz IM_CLK signal to supply the DCDCCLK reference clock. It can divide this by 16, 32, 128, or 304 to provide four possible switching frequencies of 250kHz, 125kHz, 31.25kHz, and 13.158kHz.

The switching circuitry has turn on and turn off delays that limit the minimum pulse width and can also affect the accuracy of the PWM, particularly at the higher switching frequencies between 125kHz to 250kHz. The turn on and turn off delays for different voltages are shown in Table 4-9.

Table 4-9 PWM turn on and turn off delays

Load voltage	Turn on time	Turn off time

5V	1μs	0.6μs

30V	2μs	1.2μs

4-16

Copyright © 2001-2003. All rights reserved.

ARM DUI 0163B

Image 62

Arm Enterprises IM-AD1 manual PWM controller

Contents

Integrator/IM-AD1 Integrator/IM-AD1 User Guide Conformance Notices Copyright 2001-2003. All rights reserved Integrator/IM-AD1 User Guide Chapter Introduction Appendix a Signal Descriptions Preface Intended audience Using this bookAbout this book ARM publications Typographical conventionsFurther reading Third-party documents Feedback on the Integrator/IM-AD1 FeedbackFeedback on this document Xii Introduction About the Integrator/IM-AD1 ARM DUI 0163B Integrator/IM-AD1 layout Interface module features and architecture Features Integrator/IM-AD1 block diagram Architecture Config LED Links and LEDs Care of modules Introduction Copyright 2001-2003. All rights reserved Getting Started Fitting the interface module Assembled Integrator development system Setting up the logic module Switch 2 Closed Switch 3 Open Switch 4 Open Running the test software Hardware Reference Hardware Reference Uart interface Serial interface signal assignment Signal nameConnector Description Serial connector pinout Serial connector signal assignment Pin J18 Type Description SPI signals Signal SPI PWM interface signals Signal PWM interface Shows the signal assignment PWM connector signals Pin J14 J10 Description Stepper motor interface Functional description Stepper motor interface signal summary Therefore, with a 0.1Ω sense resistor fitted Stepper motor connectors Stepper motor interface signals Stepper motor connector signals Pin J19 J23 Description VSS Gpio connectors J16 and J17 Gpio Hardware Reference Buffer Can interfaceU13 Can interface signal assignment Signal IMBBANK30 IMBBANK28IMBBANK29 Can connector signal assignments Pin GND ADC and DAC interfaces 10 ADC and DAC interface architecture IMABANK50 IMABANK48IMABANK49 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 Example architecture About the design exampleAbout PrimeCells Vhdl file descriptions File Description Example memory map Address assignment of logic modules Integrator system memory map Integrator/IM-AD1 memory map Device Address Integrator/IM-AD1 memory mapLogic module addresses Position Bits Stack Gpiob StepperbGpioa Ssram Offset address Name Type Function Example APB register peripheralLogic module registers Oscillator divisor registers VDW LMOSCx registers Bits Name Access FunctionRDW User LEDs control register Bits Name Access FunctionOscillator lock register Push button interrupt register Switches register Uart SPICS1 SPI chip select registerSPICS2 SPICS0 Synchronous serial port PWM controller Cont Offset Name Access Function AddressStepper motor peripheral Count Stepper x control register DIR DocountSinglestep Stepx count register Stepx speed register Data output set register Read data output pinsAddress offset Name Access Size Function Read data input register Data direction Gpio direction control 1 bit Ssram interface Interrupt Interrupt source Source number Vectored interrupt controllerInterrupt sources CAN1 Reference Design Example Can controller interface Can reset control registerCanreset CANxBase Adcstatus ADC and DAC interface16 ADC and DAC interface registers ADC2BUSY Bits Name Function Peripheral information block18 PIB entry format Signal Descriptions Expa Table A-1 AHB signal assignment Pin label Signal Description Expb Table A-2 Expb signal description Pin label Name Description Expim LM-EP20K1000E Description Table A-3 Expim signal descriptionsLabel Logic analyzer connector Figure A-4 J7 pin locations Table A-4 J7 connector pinout Signal Pin CLK1 Figure A-5 Multi-ICE connector pinout Multi-ICE Jtag Mechanical Specification Figure B-1 Board dimensions top view Mechanical information Figure B-2 Bottom board dimensions viewed from top side DB9STRAIGHT FCI Connector referenceDB9DUAL Glossary Multi-ICE Synchronous Serial Port DAC IndexADC Can Gpio Lmleds Lmlock LMOSC1 Expa A-2Gpiodataclr Gpiodatain Gpiodataout Gpiodataset Gpiodirn