Tài liệu Parallel Port Complete- P8 pptx

Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. [...]... A3-A5 Set Strobe=l Set Data=1 144 Parallel Port Complete Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark Output Applications CD74HC22106 CROSS POI NT SWITCH PC PARALLEL PORT 25-P1N D-CONNECTOR GND +5V p 74LS244 BUFFER 18-25 TEST C[RC U IT Figure 7-9 : The parallel port' s data lines can control an 8 x 8 crosspoint switch Parall e l Port Resource ~~~~ 8 x 8 Grosspoint... power dissipation limit for the chip PIC16CSx CMOS microcontroller Vdd-0.7@-5.4mA 0.6@8 7mA 4 5 Absolute maximums 35mA/pin, SOOmW/package 25mA/pin, SOOmW/package IOmA/pin, 15mA /port, 71mA/all ports +25/-20mA/pin, +50/-40mA /port, 800mW/package general-purpose or saturated-switch transistor that meets your voltage and current requirements Figure 7-SC uses a 2N2222, a widely available NPN transistor... MOSFET The most popular type is an enhancement-mode, N-channel type, where applying a positive voltage to the gate switches the MOSFET on, creating a low-resistance channel from drain to source 13 8 Parallel Port Complete Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark Output Applications P-channel MOSFETs are the complement of N-channel MOSFETs, much as PNP transistors complement... terminals happen to short to ground With a low-side switch, shorting the switch to ground would apply power to the load With a high-side switch, although shorting the switch to ground may destroy the Parallel Port Complete 139 Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark Output Applications P-channel MOSFETs are the complement of N-channel MOSFETs, much as PNP transistors... terminals happen to short to ground With a low-side switch, shorting the switch to ground would apply power to the load With a high-side switch, although shorting the switch to ground may destroy the Parallel Port Complete 13 9 Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark Chapter 7 +4 5V TO +18V O 10~,F 0 030 8 VS VS DSI DS2 DS3 DS4 IRF510 N-CHANNEL MOSFETS IN1 LOG[C 1=0N... When the MOSFET switches on, its low drain-to-source resistance causes the source to rise nearly to the supply voltage For the MOSFET to remain on, the gate must be more positive than the source 140 Parallel Port Complete Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark Output Applications The LTC1156 takes care of this with charge-pump circuits that bring the gate voltages... switched inductive DC load, including DC motor windings For AC loads, use a varistor in place of the diode The varistor behaves much like two Zener diodes connected anode-to-cathode on both ends 142 Parallel Port Complete Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark Output Applications Two attractions of electromagnetic relays are very low on resistance and complete physical... output bit can control power to a load The bit routines introduced in Chapter 4 make it easy to read and change individual bits in a byte If you store the last value written to the port in a variable, there's no need to read the port before each write X-10 Switches A different way to control power to devices powered at 115V AC is to use the X-10 protocol, which can send on, off; and dim commands to a device,... control over the routing of two sets of lines Examples are Harris' 74HCT22106 Crosspoint Switch with Memory Control and Maxim's MAX456 8 x 8 Video Crosspoint Switch Figure 7-9 shows how you can use the parallel port to control an 8 x 8 array of signals with the '22106 You can connect any of eight X pins to any of eight Y pins, in any combination Possible applications include switching audio signals to... few hundred to 1000 ohms are typical The resistor needs to be small enough so that the transistor can provide the current to power the load, yet large enough to limit the current to safe levels Parallel Port Complete 13 7 Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark Chapter 7 The load current must be less than the transistor's maximum collector current (Ic) Look for