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6
1.2 MICRO-800/MICRO-1000 Mode of Operation
The MICRO-800 and MICRO-1000 (which respectively utilize a CR800 and CR1000
controller, manufactured by Campbell Scientific, Inc. of Logan, Utah) mode of operation
uses two control lines to operate the multiplexer. The RESET line enables the
multiplexer and activates the MICRO-800/MICRO-1000 mode of clocking. Pulses
received on the CLOCK line sequentially increment the channels while the RESET line is
held high. See the timing diagram below;
The CLOCK line sequentially advances the channels beginning with channel 1. Note the
timing diagrams below for 16 and 32 channel switching, respectively.
T1
T2
T3
Reset
Clock
Pulse 1
No Channel
Selected
Timing:
T1 = 50 mSec(min.)
T2 = 2 mSsec(min)
T3 = 2 mSsec(min)
Figure 7 - 16 Channel MICRO-800/MICRO-1000 Channel Selection Timing
T1
T2
T3
Reset
Clock
No Channel
Selected
Timing:
Figure 8 - 32 Channel MICRO-800/MICRO-1000 Channel Selection Timing
Pulse 2
Channel 1
Selected
Pulse 1
Pulse 2
Channel 1
Channel 2
Selected
Selected
T1 = 50 mSec (min)
T2 = 2 mSec (min)
T3 = 2 mSec (min)
Pulse 31
Pulse 32
Channel 16
Selected
Pulse 32
Channel 32
No Channel
Selected
No Channel
Selected
Selected
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