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Installation and Operation
Another basic test is the low battery test. Connect a digital multimeter to the test pins
V DD and GND, to monitor the V DD . Toggle the switch SW2 toward the center of the
demo board and observe the change in V DD . Turn Rv2 counterclockwise to lower the
V DD voltage to less than 2.4V, where the low battery threshold should be set. The piezo
horn chirps once every 43 seconds. The low battery Silence mode can be entered by
pressing SW1. Refer to the RE46C190 Data Sheet for details on the Supervisory mode.
The chamber test can be evaluated by first toggling the switch SW2 toward the label
R8 and then turning the 2M POT fully counterclockwise. This places the demo board
in a Non-Alarm state. Short the test point IRED to the test point IRCAP. This disables
the smoke chamber emulator and causes the IC to fail the chamber test. Three chirps
are heard after the test fails. Refer to the RE46C190 Data Sheet for details on this
Supervisory mode.
Table 2-1 lists the program settings for the RE46C190 samples included with the demo
board. Due to limitations of the smoke emulator, the IRED current, the photo amplifier
gain and the integration time should not be changed.
TABLE 2-1:
PRE-PROGRAMMED RE46C190 SAMPLE
Parameter
Long Term Drift Limit
Chamber Test Limit
Hush Limit
Hysteresis Limit
Normal Smoke Limit
Photo Amplifier Gain Factor
Integration Time
Low Battery Trip Limit
Long Term Drift Enable
Low Battery Hush Enable
IRED Current
Hush Option
End Of Life Enable
Tone Select
Setting
0
2
20
15
20
1
100 μs
2.4V
Disable
Enable
150 mA
Never Cancel
Disabled
Temporal
Table 2-2 is a list of the test points easily available on the bottom of the demo board.
Refer to A.2 “Board Schematic - RE46C190 Application Circuit and Smoke
Chamber Regulator” for details of the connection of the test point. When using the test
points, use an oscilloscope to observe RE46C190’s operation.
? 2011 Microchip Technology Inc.
DS51970A-page 13
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