Remote-processing RPC-220 Manuel d'utilisateur Page 39
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Noté. / 5. Basé sur avis des utilisateurs
PWM AND ANALOG OUTPUT SECTION 12
PAGE 12-2
Second is step response time. Pulses are filtered through
a 1 pole filter. This means there is some delay time
from when the duty cycle changes to output change.
Generally, this is about 100 ms for small steps and 200
ms for larger (1/2 scale) steps.
Analog outputs are at J1. J1-17 is analog output 0 while
J1-19 is analog output 1. Output channels are controlled
by their corresponding P WM channel.
Example program PWM.C under directory PWM
generates a ram p on the analog outputs by continuously
varying the duty cycle.
Measuring outputs using on card A-D
The analog outputs can be set to a more precise level by
reading them at the A-D input. D ue to interactions
between the analog output and A-D circuits, a 20K ohm
or greater resistor should be placed between A-D input
and output. If the resistor is not installed, A-D
conversions intermittently read full scale (1023 counts).
Output leve ls and noise
The operational am plifier used to buffer outputs gets its
power from the RS-232 generator. If you turn of the
RS-232 output, its quite probable analog output will be
affected.
There is some noise (ripple) on the analog outputs. This
noise comes from two sources: First is the PWM signal
it self. If the CPU PWMP register is programmed for a
low frequency, there will be ripple on the output. To
correct this problem, decrea se the value w ritten to
PWMP to 0x10 or lower.
The second noise source is the RS-232 generator. The
RS-232 chip U9 generates both + and - voltages in the 8
volt range. The positive voltage is somewhat filtered.
The negative is not. To clean up the negative voltage,
put a 10 micro-farad or larger capacitor on the -V pin at
J1-20. Capacitor voltage should be 16 volts or higher.
PIN OUTS AND REGISTER
INFORMATION
The following tables are partial pin outs for J1 and J3.
Full pin out for J1 is in SECTION 11 and J3 in
SECTION 6.
Pin outs
Conn Function
J1-17 Analog output, c hannel 0
J1-19 Analog output, channel 1
J3-22 PWM output, channel 0
J3-20 PWM output, channel 1
PWM registers
Register Address Function
(in special
function area)
PWMP 0xfe Prescaler
PWM 0 0xfc Duty cycle
PWM 1 0xfd Duty cycle
APPLICATION PROGRAM
The following program is in the PWM directory. A
brief description follows:
File name Description
PWM.C Initializes PWM prescaler and varies
duty cycle from 0 to 100%. U sed also
to view voltage ramp from analog
outputs.
- TRADEMARKS 1
- NOTICE TO USER 1
- FCC NOTICE 1
- TABLE OF CONTENTS 2
- OVERVIEW SECTION 1 4
- SETUP AND OPERATION SECTION 2 10
- INTRODUCTION 12
- OPERATING MODES 12
- MEMORY MAPS 12
- ACCESSING I/O AND RAM 13
- MONITOR ROM 13
- MONITOR COMMANDS 14
- SAVING YOUR PROGRAM TO FLASH 18
- WRITING CODE FOR UPDATES 18
- WRITING FOR C 19
- USING DEMONSTRATION PROGRAMS 19
- PROGRAMS LARGER THAN 32K 19
- APPLICATION PROGRAMS 20
- SERIAL PORTS SECTION 4 21
- RAM SECTION 5 23
- DIGITAL LINES SECTION 6 24
- REAL TIME CLOCK SECTION 7 26
- COUNTER/TIMERS SECTION 8 30
- WATCHDOG TIMER SECTION 9 32
- APPLICATION PROGRAM 33
- ANALOG INPUT SECTION 11 34
- PROGRAMMING PWM 38
- ANALOG OUTPUTS 38
- PIN OUTS AND REGISTER 39
- INFORMATION 39
- DISPLAY PORT SECTION 13 40
- EXPANSION PORT SECTION 14 43
- MECHANICAL 46
- SHOCK AND VIBRATION 46
- MOUNTING TO A MOTHER BOARD 46
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