MCZ145017EG/R2 데이터 시트보기 (PDF) - Freescale Semiconductor

부품명

상세내역

제조사

MCZ145017EG/R2

Low-Power CMOS Ionization Smoke Detector IC with Temporal Pattern Horn Driver

Freescale Semiconductor 

battery, respectively. Pin 1 = VDD for smoke and Pin 4 = VDD

for low battery. In this mode and during the 10 ms power

strobe, chip current rises to approximately 50 µA.

Led Pulse

The 9-volt battery level is checked every 40 seconds

during the LED pulse. The battery is loaded via a 10 mA

pulse for 11.6 ms. If the LED is not used, it should be replaced

0.1 µF

330 Ω

8.2 MΩ

+

9V

1

16

MC145017

2

15

3

14

4

13

5

12

6

11

7

10

8

9

with an equivalent resistor such that the battery loading

remains at 10 mA.

Hysteresis

When smoke is detected, the resistor/divider network that

sets sensitivity is altered to increase sensitivity. This yields

approximately 100 mV of hysteresis and reduces false

triggering.

1M

1M

Test

0.1 µF

0.001 µF

1.5 MΩ*

220 kΩ*

*NOTE: Component values may change depending on type of piezoelectric horn used.

Figure 6. Typical Application as Ionization Smoke Detector

OSC

Pin 12

Smoke - N

-Y

Low Bat - Y

-N

HYST

Pin 13

1 23 45 67 8 9

23 24 1

6

12

18

No Smoke, Low Battery

No Smk

No Low Bat

Smoke

Latch Alarm Condition

( 100 mV Level Shift)

24

OSC

Pin 12

Smoke - N

-Y

No Smk

LOW BAT - Y

-N

HORN - On LOW BATTERY CHIRP >>

- Off

NFPA MOD >>

(Note 1)

LED - Off

- On

24 Clocks

24 Clocks

NOTES:

1. Horn modulation is self-completing. When going from smoke to no smoke, the alarm condition will terminate only when horn is off.

2. Comparators are strobed once per cycle (1.65 sec for no smoke, 40 msec for smoke).

Figure 7. MC145017 Timing Diagram

Sensors

Freescale Semiconductor

HORN - ON

- OFF

LED - OFF

- ON

MC145017

5

Share Link: