MPXM2102AS datasheet(639/670 Pages) MOTOROLA

639 / 670 page

MC145012

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Motorola Sensor Device Data

www.motorola.com/semiconductors

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 = 7.5 MΩ)

No.

Symbol

Parameter

Test Condition

Clocks

Min*

Typ**

Max*

Unit

1/fosc

Oscillator Period

Free–Running Sawtooth

Measured at Pin 12

7.0

7.9

8.6

tLED

LED Pulse Period

No Local Smoke, and

No Remote Smoke

4096

28.8

32.4

35.2

Remote Smoke, but

No Local Smoke

—

Extinguished

Local Smoke

0.45

0.5

0.55

Pushbutton Test

0.45

0.5

0.55

tw(LED),

tw(stb)

LED Pulse Width and Strobe

Pulse Width

7.0

—

8.6

tIRED

IRED Pulse Period

Smoke Test

1024

7.2

8.1

8.8

tIRED

IRED Pulse Period

Chamber Sensitivity Test,

without Local Smoke

4096

28.8

32.4

35.2

Pushbutton Test

128

0.9

1.1

tw(IRED)

IRED Pulse Width

Tf*

116

µs

IRED Rise Time

—

µs

IRED Fall Time

—

200

ton

Silver and Brass Temporal

Mdlti

Width

0.45

0.5

0.55

toff

Modulation Pulse Width

0.45

0.5

0.55

toffd

192

1.35

1.52

1.65

tCH

Silver and Brass Chirp Pulse

Period

Low Supply or Degraded

Chamber Sensitivity

4096

28.8

32.4

35.2

twCH

Silver and Brass Chirp Pulse

Width

7.0

7.9

8.6

tRR

Rising Edge on I/O to Smoke

Alarm Response Time

Remote Smoke,

No Local Smoke

—

2 !

—

tstb

Strobe Out Pulse Period

Smoke Test

1024

7.2

8.1

8.8

Chamber Sensitivity Test,

without Local Smoke

4096

28.8

32.4

35.2

Low Supply Test,

without Local Smoke

4096

28.8

32.4

35.2

Pushbutton Test

—

* 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. The timing shown should accomodate the NFPA

72, ANSI S3.41, and ISO 8201 audible emergency evacuation signals.

** Typicals are not guaranteed.

! Time is typical — depends on what point in cycle signal is applied.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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