CMPE 118 MECHATRONICS Digital I/O Transistors and Mosfets.

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Presentation transcript:

CMPE 118 MECHATRONICS Digital I/O Transistors and Mosfets

CMPE 118 MECHATRONICS Bipolar Transistors used as Switches NPNPNP Base Emitter Collector Emitter How do we get them turned on? Forward bias the Base:Emitter Junction Supply current How much current? 1/10th as much as the Collector:Emitter current How do we know if we have been successful? V ce will drop to about 0.2V

CMPE 118 MECHATRONICS Bipolar Transistors used as Switches How do we get them turned on? How do we know if we have been successful?

CMPE 118 MECHATRONICS MOSFET Transistors used as Switches N-Channel P-Channel Gate Source Drain Source Drain How do we get them turned on? |V GS | > Threshold N-Channel: G > S, P-Channel G < S How do we know if we have been successful? R DS will drop to a low value

CMPE 118 MECHATRONICS MOSFET Transistors used as Switches How do we get them turned on? How do we know if we have been successful?

CMPE 118 MECHATRONICS What is CMOS ? Complementary MOS N-Channel and P-Channel used in Pairs

CMPE 118 MECHATRONICS What is CMOS ?

CMPE 118 MECHATRONICS Digital Inputs Logic Levels Voltage Levels 01 < Low Threshold > High Threshold

CMPE 118 MECHATRONICS What Are the Voltage Levels? That Depends on the type of logic... Transistor Transistor Logic High-speed CMOS High-speed CMOS, TTL input Original CMOS

CMPE 118 MECHATRONICS How is the Voltage Specified?

CMPE 118 MECHATRONICS It takes Voltage and Current to make a device work

CMPE 118 MECHATRONICS Inter- Connecting

CMPE 118 MECHATRONICS Bipolar TTL OutputDigital Logic

CMPE 118 MECHATRONICS Open Collector Output Digital Logic

CMPE 118 MECHATRONICS CMOS Totem PoleDigital Logic

CMPE 118 MECHATRONICS Sizing a pull-up Resistor: Max & Min.

CMPE 118 MECHATRONICS

74HC04

CMPE 118 MECHATRONICS 74HC04

CMPE 118 MECHATRONICS Absolute Maximum Ratings Not so Useful Quite Useful

CMPE 118 MECHATRONICS Absolute Maximum Ratings

CMPE 118 MECHATRONICS Logic Levels and Noise Margins

CMPE 118 MECHATRONICS What about Slowly Changing Inputs?

CMPE 118 MECHATRONICS How do you get Hysterisis ? 1) Schmitt Trigger inputs 2) Comparator with Hysterisis

CMPE 118 MECHATRONICS

74HC14

CMPE 118 MECHATRONICS The DarlingtonPower Outputs

CMPE 118 MECHATRONICS

DS3658

CMPE 118 MECHATRONICS DS3658

CMPE 118 MECHATRONICS

ULN2003A (1 of 7 per package)

CMPE 118 MECHATRONICS ULN2003A Specifications

CMPE 118 MECHATRONICS Not all 7 at once !