RE46C180S16TF【PDF 19/58 页】IC ION SMOKE DETECT ASIC 16SOIC

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?2011 Microchip Technology Inc.

DS22275A-page 19

RE46C180

FIGURE 4-1:

Nominal Application Circuit for Programming.

4.2

Smoke Calibration

A separate calibration mode is entered for each mea-

surement mode (Normal, Hysteresis, HUSH and

PTT/Chamber Test) so that independent limits can be

set for each.

In all calibration modes the V

SEN

voltage, which repre-

sents the smoke sensitivity level, can be accessed at

T3 output. The SmkCompOut output voltage is the

result of the comparison of DETECT and V

SEN

, and

can be accessed at TESTOUT output. The FEED input

can be clocked to cycle through the available smoke

sensitivity levels. Once the desired smoke sensitivity

level is reached, the IO input is pulsed low to high to

store the result.

The detailed procedure is described in the following

steps:

1. Power up with the bias condition shown in

Figure 4-1. At power-up:

TEST = IO = FEED = T2 = V

DETECT = V

. Now in mode M0.

2. Drive T2 input from V

to V

and hold at V

to enter TM0.

3. Drive TEST from V

to V

and hold at V

4. Apply four clock pulses to the T2 input (V

and back to V

) to enter in TM4 mode.

This initiates the Calibration mode for the normal

sensitivity setting. Drive TEST from V

to V

to turn on the smoke comparator and enable the

T3 switch. The standby smoke sensitivity V

SEN

will appear at T3. The smoke comparator output

will appear at TESTOUT. Clock FEED to

increase or decrease the V

SEN

levels as

needed. The IO input is pulsed low-to-high to

save the result.

5. Drive TEST from V

to V

and hold at V

Apply another clock pulse to the T2 input, to

enter in TM5 mode. This initiates the Calibration

mode for the hysteresis setting. Drive TEST

from V

to V

to turn on the smoke compara-

tor and enable the T3 switch. The local alarm

smoke sensitivity V

SEN

will appear at T3. The

smoke comparator output will appear at TES-

TOUT. Clock FEED to increase or decrease the

SEN

levels as needed. The IO input is pulsed

low-to-high to save the result.

Battery

TEST

GLED

CHAMBER

RLED

TESTOUT

FEED

GUARD2

DETECT

VSS

RE46C180

V2 V3 V4

Monitor TESTOUT,

T3 and CHAMBER

GUARD1

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