122-28176 Parallax Inc, 122-28176 Datasheet - Page 81
122-28176
Manufacturer Part Number
122-28176
Description
GUIDE STUDENT PROCESS CONTROL
Manufacturer
Parallax Inc
Specifications of 122-28176
Accessory Type
Manual
Product
Microcontroller Accessories
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
Propeller Education (PE) Kit
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
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Note the similarities in operation:
Another transistor configuration is the common-collector. What is common (emitter,
collector, or base) can be recognized by which terminal is NOT used by either the input
or the output. Consider the comparison in Figure 3-18 to a pushbutton switch.
The transistor will be in cutoff and act as an open-switch when insufficient V
to the transistor base. Just as with the pushbutton the output will be LOW through the
pull-down resistor.
When V
acting as a closed-switch and Vdd will be felt on the output (minus 0.3 V dropped across
the collector-emitter junction).
Figure 3-18 Switch Equivalent Common-Collector Configuration
N. O. Active High Switch with Pull-down
•
•
•
The pushbutton is activated by pressing it. The transistor is active (in saturation)
when sufficient voltage is applied to V
Both circuits have a HIGH output when the switch is not active through the use
of pull-up resistors.
Both outputs go LOW when the device is activated.
I
is a sufficient voltage, the base current will drive the transistor into saturation,
I
providing the base current required.
Common-Collector Configuration
I
is applied
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