MC145010P Freescale Semiconductor, MC145010P Datasheet - Page 10

• Manufacturer Part Number: MC145010P
• Description: IC SMOKE DETECT PHOTOELEC 16-DIP
• Manufacturer: Freescale Semiconductor
• Type: Smoke Detectorr

Specifications of MC145010P

• Input Type: Logic
• Output Type: Logic
• Current - Supply: 12µA
• Mounting Type: Through Hole
• Package / Case: 16-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Interface: -

MC145010
10
Table 5. Configuration of Pins in the Calibration Mode
Low-Supply Trip
Description
Feedback
Silver
Brass
OSC
I/O
NOTES:
Illustration is bottom view of layout using a Dip. Top view for SOIC layout is mirror image. Optional potentionmeter R9 is not illustrated.
Drawing is not to scale.
Leads on D2, R11, R8, and R10 and their associated traces must be kept as short as possible. This practice minimizes noise pick-up.
Pin 3 must be decoupled from all other traces.
Pin
15
10
12
7
9
8
Disabled as an output. Forcing this pin high places the photo amp output on pin 1 or 2, as determined by
Low-Supply Trip. The amp's output appears as pulses and is referenced to V
If the I/O pin is high, pin 15 controls which gain capacitor is used. Low: normal gain, amp output on pin 1.
High: supervisory gain, amp output on pin 2.
Driving this input high enables hysteresis (10% gain increase) in the photo amp; pin 15 must be low.
Driving this input high brings the internal clock high. Driving the input low brings the internal clock low. If
desired, the RC network for the oscillator may be left intact; this allows the oscillator to run similar to the
normal mode of operation.
This pin becomes the smoke comparator output. When the OSC pin is toggling, positive pulses indicate that
smoke has been detected. A static low level indicates no smoke.
This pin becomes the smoke integrator output. That is, two consecutive smoke detections are required for
ON (static high level) and two consecutive no-detections for “off” (static low level).
Additional Traces
Do Not Run Any
In This Region
Figure 9. Recommended PCB Layout
Pin 16
Pin 9
Pin 1
Pin 8
C1
MOUNTED IN
CHAMBER
R11
D2
R14
Comment
R8
DD
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