October 2013
Intermediate to advanced
312 pages
12h 10m
English
Content preview from The Maplin Electronic Circuits Handbook, 2nd Edition
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OUTPUT DRIVERS 185
100 η 100 η
+ 4 , +
Figure
8.11
Typical
arrangement of output loads for
the circuit of Figure 8.10
Figure 8.11 shows how the circuit of Figure 8.10 can be used to drive
two 12 V motors, a warning device, and five LEDs. The control byte sent
to the device would then take the following form:
Device controlled
D5
D4
D3
D2 Dl WDl M2 Ml
Data
line
D7 D6 D5
D4 D3
D2 Dl
DO
As an example, suppose we wish to simultaneously operate Ml and Dl,
the corresponding output bit pattern would be, 00001001 (equivalent to
a hexadecimal value of 09). Alternatively, to operate D5, D4, and WDl
simultaneously we would need to output a bi
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