RE46C180S16TF【PDF 35/58 页】IC ION SMOKE DETECT ASIC 16SOIC

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?2011 Microchip Technology Inc.

DS22275A-page 35

RE46C180

4.8

Low Battery Test

Test mode TM17 allows the low battery trip point to be

tested. To enter this mode, follow these steps:

1. Power up with the bias condition shown in

Figure 4-1 to enter M0. At power-up:

TEST = IO = FEED = T2 = V

DETECT = V

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 17 clock pulses to the T2 input (V

and then back to V

) to enter in TM17

mode.

5. Drive IO from V

to V

to enable the low

battery testing and turn on the RLED. Sweep

from high to low and monitor TESTOUT

output. The TESTOUT output will indicate the

Low Battery status (High = Low Battery

detected).

FIGURE 4-8:

Timing Diagram for Low Battery Test in Mode TM17.

VDD

TEST

VSS

VDD

VSS

Min TSETUP1 = 1

Min TPW1 = 1

Min T1 = 2

VDD

VSS

7.5V

VDD

ESTOUT

VSS

MODE

TM0

TM1

TM2

TM3

TM4

TM5

TM6

TM17

Note: Assume the 7.5V low battery trip point is selected.

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