AMICUS18-COMPANION-SHIELD AMICUS, AMICUS18-COMPANION-SHIELD Datasheet - Page 31

• Manufacturer Part Number: AMICUS18-COMPANION-SHIELD
• Description: Amicus18 Companion Shield
• Manufacturer: AMICUS

Specifications of AMICUS18-COMPANION-SHIELD

• Silicon Manufacturer: Microchip
• Core Architecture: PIC
• Core Sub-architecture: PIC18
• Features: USB Interface, In Circuit Serial Programming Interface
• Kit Contents: Board
• Silicon Family Name: PIC
• Silicon Core Number: PIC18F25K20
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: PIC18F25K20 Microcontroller

Analogue Meets Digital
Not everything in the microcontroller world is made up of ons or offs, sometimes the input required is of
an analogue nature i.e. a voltage. This is where an Analogue to Digital Converter (ADC) comes into it’s
own. An ADC samples the incoming voltage and converts it to a binary representation. The Amicus18
has nine ADC inputs, each capable of producing a 10-bit sample (0 to 1023). The ADC can measure re-
sistance, current, sound, in fact anything that has a voltage.
To illustrate the use of the ADC peripheral, use the layout below:
The circuit for the above layout is shown below:
Crownhill AssociatesLimited 2009 - All Rights Reserved
Amicus18 Companion Shield
Version 1.0
AN4/AN5
AN3/RA3
AN2/RA2
AN1/RA1
AN0/RA0
PortA
Power
GND
GND
RA4
3V3
Rst
Vin
5V
30
Potentiometer
100K
Ω
06-10-2009