User manual

Installation and Operation

Another basic test is the low battery test. Connect a digital multimeter to the test pins

and GND, to monitor the V

. Toggle the switch SW2 toward the center of the

demo board and observe the change in V

. Turn Rv2 counterclockwise to lower the

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 2-2 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.

TABLE 2-1: PRE-PROGRAMMED RE46C190 SAMPLE

Parameter Setting

Long Term Drift Limit 0

Chamber Test Limit 2

Hush Limit 20

Hysteresis Limit 15

Normal Smoke Limit 20

Photo Amplifier Gain Factor 1

Integration Time 100 µs

Low Battery Trip Limit 2.4V

Long Term Drift Enable Disable

Low Battery Hush Enable Enable

IRED Current 150 mA

Hush Option Never Cancel

End Of Life Enable Disabled

Tone Select Temporal