28123 Parallax Inc, 28123 Datasheet - Page 276
![TEXT WHAT'S A MICROCONTROLLER](/photos/6/49/64955/mfg_28123_sml.jpg)
28123
Manufacturer Part Number
28123
Description
TEXT WHAT'S A MICROCONTROLLER
Manufacturer
Parallax Inc
Type
Programmingr
Datasheet
1.28123.pdf
(340 pages)
Specifications of 28123
Style
Book
Title
What's a Microcontroller?
Contents
Whats a Microcontroller? Text
Product
Microcontroller Accessories
Core Processor
PIC16C57c
Flash
128 Bytes
Operating Supply Voltage
9 V
Board Size
31 mm x 16 mm
Lead Free Status / RoHS Status
Not applicable / Not applicable
- Current page: 276 of 340
- Download datasheet (6Mb)
Digital Pot Controlled Transistor Parts
(1) Transistor – 2N3904
(2) Resistors – 100 kΩ (brown-black-yellow)
(1) LED – any color
(1) Digital potentiometer – AD5220
Building the Digital Potentiometer Circuit
Figure 9-6 shows a circuit schematic with the digital potentiometer used in place of a
manual potentiometer, and Figure 9-7 shows a wiring diagram for the circuit. The
BASIC Stamp can control the digital potentiometer by issuing control signals to P5 and
P6.
Vdd
6. B1 – The potentiometer’s B terminal.
7. CS – The chip select pin. Apply a high signal to this pin, and the chip ignores all
8. Vdd – Connect to +5 V, which is Vdd on the Board of Education and BASIC
P6
P5
√
control signals sent to CLK and U/D. Apply a low signal to this pin, and it acts
on any control signals it receives.
Stamp HomeWork Board.
The AD5220 Part Datasheet:
www.analog.com. Enter AD5220 into the Search field on Analog Devices’ home page, and
click the Search button. Click the Data Sheets link. Click the link that reads “AD5220:
Increment/Decrement Digital Potentiometer Datasheet”.
Build the circuit shown in Figure 9-6 and Figure 9-7.
1
2
3
4
CLK
U/D
A1
GND
AD5220
Vss
Vdd
W1
CS
B1
6
5
8
7
Vdd
To see the part datasheet for the AD5220: Go to
100 k
100 k
Ω
Ω
Vdd
Vss
Figure 9-6
Digital Potentiometer
Controlled Transistor
Circuit Schematic
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