Custom Chip Voltage Level Detection - Fluke 9100 Series Service Manual

together provide a regulated output with high current sinking
capability. Typical current seen by these regulators can vary from 10 to
40 mA. The approximate VHI and VLO levels generated are listed in Table
2-3.
Table 2-3.
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A voltage level-detection system in the custom chip uses data inputs,
VHI, and VLO voltage levels to detect a high voltage input, a low
voltage input, or a tri-state condition. See Figure 2-8 for an
illustration of the detection circuitry contained in the custom chip.
The actual input thresholds for the high and low
comparators are computed from the formulas shown
in Figure 2-8.
Figure 2-8. Custom Chip Voltage Level Detection
Multi-Detection and Interrupt
The Vector Output I/O Module accepts different sizes of clip modules. A
detection system within the module informs the mainframe as to the size
of the clip that has been installed on the module. Clip modules are
available in a half-size module and a full-size module. The half-size
module plugs into one connector (either J1 or J2 on the Top PCA), and
VHI and VLO for TTL and CMOS Logic Levels
DESC THRSH
TTL 1
CMOS 0
VHI
-1.05V -2.45V
-0.25V -2.25V
NOTE
2-15
2/Theory of Operation
VLO