Vex CORTEX Podręcznik Użytkownika Pobierz pdf (Strona 13)

Cortex Microcontroller and VEXnet Joystick User Guide

Page 13 of 14

10. Analog Information: Analog lines are input only and read about 0.2 volts when open. Circuit details are as

follows:

a. Analog input range is 0 to +5 volts.

b. Analog to digital resolution is 12-bit, compiler resolution may vary.

c. Analog circuit has a 470k pull-up to +5 volts, a series 10k resistor and a 20k resistor to ground.

d. Analog inputs also have a 1000 pF capacitor to ground on the processor side of the 10k resistor.

e. 3 dB bandwidth: 16 kHz.

f. Circuit connections as shown.

Weak Pull-up

In Processor

Digital Input Output

1000 PF

3.3 V

1 K

Digital Port

Analog Input

(Typical)

To Processor

20K

1000 PF

470 K

10 K

+5 V

Analog Port

11.DigitalInformation:Whenconguredasaninput,digitallineshaveaweakpull-up. When congured as an output,

digital lines drive 0 volts for a low and 3.3 volts for a high. Circuit details are as follows:

a. Digital input range is 0 to +5 volts.

b. Digital drive is primarily limited by the 1k series resistor, so it can output a 2v high into 2k-ohms to ground or a 0.8v

low into 7k-ohms to 3.3v.

c. Digital inputs also have a 1000 pF capacitor to ground on the processor side of the 1k resistor.

d. 3 dB input bandwidth: 150 kHz.

e. Circuit connections as shown.

12.CircuitdetailsoftheDigital-to-AnalogPort,SP:

a. Circuit SP is connected to the Digital-to-Analog-Converter (DAC) output of the User Processor.

b. Factory default Hex le does not support the DAC output. Check your compiler for availability and use.

c. SP is an Analog Output when congured by compiler. Drive is primarily limited by a 5 kilo-ohm internal processor

resistance and by the 100 ohm series resistor. Output swing of the processor into an open load is 0.2v to 3.1v, typical.

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