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MC145011

Photoelectric Smoke Detector IC with I/O For Line-Powered Applications

Motorola => Freescale 

MC145011

AC ELECTRICAL CHARACTERISTICS (Reference Timing Diagram Figures 3 and 4)

(TA = 25°C, VDD = 9.0 V, Component Values from Figure 5: R1 = 100.0 KΩ, C3 = 1500.0 pF, R2 = 10.0 MΩ)

No. Symbol

Parameter

Test Condition

1

1/fosc

Oscillator Period*

Free–Running Sawtooth

Measured at Pin 12

Min

Max Unit

9.5

11.5 ms

2

tLED

LED Status

No Local Smoke, and

No Remote Smoke

Illuminated

3

Remote Smoke, but

Illuminated

No Local Smoke

4

Local Smoke or Pushbutton

Extinguished

Test

5

tw(stb)

Strobe Pulse Width

6

tIRED

IRED Pulse Period

7

Smoke Test

Chamber Sensitivity Test,

without Local Smoke

9.5

11.5 ms

9.67 11.83 s

38.9 47.1

8

Pushbutton Test

0.302 0.370

9

10

11

11, 12

13

tw(IRED)

tr

tf

tmod

ton/tmod

tCH

IRED Pulse Width

IRED Rise Time

IRED Fall Time

Silver and Brass Modulation Period

Silver and Brass Duty Cycle

Silver and Brass Chirp Pulse Period

Local or Remote Smoke

Local or Remote Smoke

Low Supply or Degraded

Chamber Sensitivity

94

116

µs

—

30

µs

—

200

297

363 ms

73

77

%

38.9

47.1

s

14

tw(CH)

Silver and Brass Chirp Pulse Width

Low Supply or Degraded

Chamber Sensitivity

9.5

11.5 ms

15

tRR

Rising Edge on I/O to Smoke Alarm Response Time Remote Smoke,

No Local Smoke

—

800 ms

16

tstb

Strobe Pulse Period

17

Smoke Test

Chamber Sensitivity Test,

without Local Smoke

9.67 11.83 s

38.9 47.1

18

Low Supply Test,

38.9 47.1

without Local Smoke

19

Pushbutton Test

0.302 0.370

* Oscillator period T (= Tr + Tf) is determined by the external components R1, R2, and C3 where Tr = (0.6931) R2 C3 and Tf = (0.6931) R1 C3.

The other timing characteristics are some multiple of the oscillator timing as shown in the table.

4

Motorola Sensor Device Data

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