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MC14568 Folha de dados(PDF) 4 Page - Freescale Semiconductor, Inc |
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MC14568 Folha de dados(HTML) 4 Page - Freescale Semiconductor, Inc |
4 / 11 page Sensors 4 Freescale Semiconductor MC14568 PIN DESCRIPTIONS TIMER START (PIN 1) An internal timer is provided that can be used in various configurations to allow for a period of reduced smoke detector sensitivity (“hush”). When a high-to-low transition occurs at pin 1, the internal timer is reset, the timer mode enabled, and the circuit reset to a no alarm condition. I/O (PIN 2) Pin 2 is an input/output pin designed to be connected to other smoke units for remote smoke sensing. In a local smoke condition, this pin is driven high by the unit sensing smoke. All other units in the network will then go into remote smoke mode. LOW-V SET (PIN 3) Pin 3 is the low voltage set pin. This pin has an internal fixed bias to monitor the battery. Using an external resistor from pin 3 to either VDD or VSS allows the user to change this bias to some fraction of VDD. TIMER OUTPUT (PIN 4) This pin is an open drain output that can be used in various timer configurations to alter the IC’s sensitivity. A high to low transition on pin 1 causes this output to pulse for 231 internal clock cycles. LED (PIN 5) This pin is the LED cathode connection pin and is driven low when the LED pulses. VDD (PIN 6) This is the positive power supply for the entire IC. TIMING RESISTOR (PIN 7) This pin, when tied through a resistor to VDD, works along with pin 12 to set the bias current that controls the oscillation frequency. FEEDBACK (PIN 8) This is the feedback pin used for driving the piezo electric element. VSS (PIN 9) This is the negative power supply pin for the entire IC (usually ground). HORN 1 (PIN 10) This is one of two pins that drive the horn element (i.e., brass and silver). HORN 2 (PIN 11) This is one of two pins that drive the horn element (i.e., brass and silver). OSCILLATOR CAP (PIN 12) This pin, when tied to a low leakage capacitor to VSS, works with pin 7 to set the internal oscillation frequency. SENSITIVITY SET (PIN 13) This pin is set internally to provide the reference sensitivity for the detect pin (pin 15). An external resistor from pin 13 to either VDD or VSS can adjust the sensitivity. GUARD 1/LOW Z (PIN 14) This pin provides a low impedance guard for the detect pin (pin 15) to reduce leakage currents. DETECT INPUT PIN (PIN 15) This pin functions as a low leakage smoke detect pin when used in conjunction with an Ionization type element. GUARD 2/HIGH Z (PIN 16) This pin provides a high impedance guard for the detect pin (pin 15) to reduce leakage currents. II/O I/O Current(1) VI/O = VDD - 2.0 V VI/O = VDD - 2.0 V VI/O = 1.0 V No Alarm Alarm Charge Dump 225 -75 5.0 — — — 60 — — µA mA mA I/O Charge Dump Duration After Local Alarm or Test 2 1.33 1.66 1.99 s I/O Delay Alarm Out 2 — 3.0 — s VI/O I/O VIH, VIL VIH, VDD = 9.0 V VIL, VDD = 9.0 V 23.2 — — — — 1.5 V IDD Supply Current VDD = 9.0 V VDD = 12 V No Alarm, No Loads No Alarm, No Loads 6— — 5.0 — 9.0 12 µA 1. This specification also shows VOH of VDD - 2.0 V and VOL of 1.0 V at respective currents. 2. Negative current is defined as coming out of (sourcing) the specified device pin. 3. Alarm (Smoke) Condition is defined as V15 < V13; No Alarm (No Smoke) Condition as V15 > V13. 4 No Loads means the IC in standby mode with a 0.1 µF capacitor on pin 12 to VSS and an 8.2 MΩ resistor on pin 7 to VDD with Pin 2 tied low (LED and Horn are off). Table 2. Electrical Characteristics (continued) Characteristics noted under conditions TA = +25°C, VDD = 9.0 V, VSS = 0 V, C12 = 0.1 µF (Oscillator Pin) R7 = 8.2 mΩf/fn (timing resistor pin) unless otherwise noted. Symbol Characteristic Test Condition Test Pin Min Typ Max Unit |
Nº de peça semelhante - MC14568 |
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Descrição semelhante - MC14568 |
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