DM-COP8/20D National Semiconductor, DM-COP8/20D Datasheet - Page 240
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DM-COP8/20D
Manufacturer Part Number
DM-COP8/20D
Description
CABLE FOR DEBUG MODULE 20-DIP
Manufacturer
National Semiconductor
Datasheet
1.DM-COP820D.pdf
(254 pages)
Specifications of DM-COP8/20D
Accessory Type
20-DIP Target Cable
For Use With/related Products
MetaLink Debug Module
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
*DM-COP8/20D
- Current page: 240 of 254
- Download datasheet (2Mb)
4.17.2 Keypad Scanning
Figure 4-28 shows the keypad organization. Pins L0-L4 are normally output high. The
input pins F2 and F3 are low when no key is pressed and high when a key is pressed.
4.17.3 Over-Voltage and Under-Voltage Detection
The status of line voltage range is read through the F0 and F1 pins. Reading lows at these
pins indicate a line voltage out of normal range. Reading highs indicate the line voltage
is within the normal range. See Figure 4-29.
4.17.4 Drive Circuits for Fan, Compressor and Buzzer
Figure 4-30 shows the appropriate drive circuitry. Relay J controls the compressor
switch. Three triacs are used to control the fan in high, medium, and low states.
Figure 4-29 shows only one triac. The MOC3041 is an optoelectric isolation driver with
zero cross trigger. When one key is pressed, the D pin outputs a positive pulse to activate
the buzzer FM0.
4-48
COP8SAx7 APPLICATION IDEAS
LM35
V
CC
Figure 4-27 Temperature Detection Circuit
100k
10k
100k
7
5
1
47
8
6
C2
1 F
LM331
4
0
12k
6.8k
0
6.0k
103
C1
G0/INT
COP8SAB7
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