COP8SA-DM National Semiconductor, COP8SA-DM Datasheet - Page 240

• Manufacturer Part Number: COP8SA-DM
• Description: MODULE DEBUGGING FOR COP8SA
• Manufacturer: National Semiconductor

Specifications of COP8SA-DM

• Module/board Type: Debugger Module
• For Use With/related Products: Cop 8
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: *COP8SA-DM

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