28123 Parallax Inc, 28123 Datasheet - Page 174
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
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Figure 6-3 shows a schematic of the LEDs inside the 7-segment LED display. Each LED
anode is connected to an individual pin. All the cathodes are connected together by wire
inside the part. Because all the cathodes share a common connection, the 7-segment LED
display can be called a “common cathode” display. By connecting either pin 3 or pin 8 of
the part to Vss, you will connect all the LED cathodes to Vss.
Pin Map: Figure 6-2 is an example of a pin map. A pin map contains useful information that
helps you connect a part to other circuits. Pin maps usually show a number for each pin, a
name for each pin, and a reference. Take a look at Figure 6-2. Each pin is numbered, and
the name for each pin is the segment letter next to the pin. The reference for this part is its
overall appearance. You know by looking at the top of the display that pin 1 is closest to the
lower-left corner of the display. Other parts have more subtle references, such as the flat
spot on a regular LED’s case.
10 9
1 2
G F
E D
E
F
Common
Common
Cathode
Cathode
D
8
3
G
A
7 6
4 5
C
A B
C DP
B
Figure 6-2
7-Segment
LED Display
Part Drawing
and Pin Map
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