Remote-processing RPC-220 Manual de usuario descargar pdf (Pagina 37)

ANALOG INPUT SECTION 11

Page 12-4

J1 Pin Name

1 Analog input 0

2 Ground

3 Analog input 1

4 Ground

5 Analog input 2

6 Ground

7 Analog input 3

8 Ground

9 Analog input 4

10 Ground

11 Analog inp ut 5

12 Ground

13 Analog inp ut 6

14 Ground

15 Analog inp ut 7

16 Start convert input

17 Analog ou tput 0

18 +V (.8.5 volts)

19 Analog ou tput 1

20 -V (. -8 volts)

CALIBRATION

R4 is used to adjust the maximum, or reference voltage.

Its location is shown in Figure 11-1 above. Norm ally,

the reference is 5.000 volts. You can adjust R4 so the

reference voltage is between about 4. 8 and 5.2 volts.

Adjusting the reference voltage to 5.12 volts makes easy

binary to voltage conversion (5 mv/bit) for display or

over range condition on a sensor output.

To calibr ate or othe rwise a djust the reference, connect a

volt meter between J1-2 and R3, pin 1. If the voltage

you are measur ing is about 9 volts, then you probably

have the wrong side of R3. Adjust R4 for the desired

voltage. Adjustment is best accomplished using a 3 mm

screw driver slot.

APPLICATION PROGRAMS

Program s are in the ANALOG directory.

File name Description

AIN220-1. C Simple polled mode. All channels

printed out. Prints out as a real

voltage. i.e. 3.74

AIN220-2. C Same as above except interrupt driven.

Int handler gets data and puts it into a

global variable.

AIN220-3. C Interrupt driven, but triggered

externally at J1-16 (CPU STADC pin)

on a rising pulse. Result for channel

one only printed.

Functions are named AIN(channel), where channel is

from 0 to 7. Return values are always in the 0 to 1023

range.

To convert a returned number to a voltage (reference set

to 5.000 volts), multiply the result by .004883. The

Dunfield C compiler does not support floating point

directly. All application programs show a way to print

out a value as if it were floating point by using 'long'

data types.

Reference

Phillips Sem iconductor s Application note

EIE/AN93017, page 6-196 ff.

J1 ANALOG I/O CONNECTOR PIN OUT

The table below is a pin out for analog connector J1.

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 ... 46 47

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Remote-processing RPC-220 Manual de usuario Pagina 37

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