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MC145010ED Folha de dados(PDF) 10 Page - Freescale Semiconductor, Inc |
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MC145010ED Folha de dados(HTML) 10 Page - Freescale Semiconductor, Inc |
10 / 12 page Sensors 10 Freescale Semiconductor MC145010 Figure 9. Recommended PCB Layout Table 5. Configuration of Pins in the Calibration Mode Description Pin Comment I/O 7 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 VDD. Low-Supply Trip 15 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. Feedback 10 Driving this input high enables hysteresis (10% gain increase) in the photo amp; pin 15 must be low. OSC 12 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. Silver 9 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. Brass 8 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). Pin 8 Pin 16 Pin 9 Pin 1 C1 R11 D2 R8 MOUNTED IN CHAMBER Do Not Run Any Additional Traces In This Region R14 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. |
Nº de peça semelhante - MC145010ED |
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Descrição semelhante - MC145010ED |
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