PT8A2544PE

PT8A2524-26/34-36/44-46 |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| Universal Timer Controller Features Description Ɣ Universal timer is a mixed signal CMOS IC designed for a fixed timer to drive external RELAY to implement safety power control. It is applied to 120V/240V and 50/60Hz AC power supply. It can automatically shut-off load in order to prevent undesired conditions from the system. Internal timer can present several kinds of different time: 15mins, 30mins, 45mins, 1hr, 1.5hrs, 2hrs, 4hrs and 8hrs, which is decided by part number. Ɣ Ɣ Ɣ Ɣ Ɣ Ɣ Ɣ Ɣ Ɣ Auto-shut off output once time-out Button to ON/OFF/RESET timer Available timer with high precision same as AC 50/60hz Build-in RC oscillator Drive external RELAY Support 50/60Hz by part Quick Test Mode (QTM) for manufacturer Available timer of 15/30/45/60/90/120/240/480min Buzzer function(PT8A2524/25/34/35/44/45 Optional) Low cost lead free package: TO94-4 or DIP-8 or SOIC-8 Applications x Universal Timer Controller Pin Configuration PT8A2524/5/6A-H PT8A2534/5/6A-H TO94-4(Top View) PT8A2544/5/6 DIP-8 or SOIC-8 (Top View) Pin Description PT8A2524/5/6A-H, PT8A2534/5/6A-H Pin Name Pin No I/O Pin Description GND 1 Ground DISC 2 I/O Control output if discharging external capacitor and button input, high active RELAY 3 I/O RELAY output and button input, high active VCC 4 Power supply PT8A2544/5/6 Pin Name Pin No. I/O Pin Description Timer selection pins(TS2 TS1 TS0 from 000~111) TS2 1 I 000: 15m, 001: 30m, 010: 45m, 011: 60m, TS1 2 I 100: 90m, 101: 120m,110: 240m,111: 480m TS0 3 I Default 011 by TS2 internal pull down, TS1&TS0 internal pull up GND 4 Ground DISC 5 I/O Control output if discharging external capacitor and button input, high active RELAY 6 I/O RELAY output and button input, high active 50/60Hz selection pin: default is 60Hz by internal pull down; connecting to VCC is ACSEL 7 I 50Hz. VCC 8 Power supply 2013-12-0013 PT0266-5 1 01/03/14 PT8A2524-26/34-36/44-46 Universal Timer Controller ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| Maximum Ratings Storage Temperature ...................................................................................... -40oC to +125oC Supply Voltage to Ground Potential (Input & VCC Only)............... -0.5V to VCC + 0.5V Supply Voltage to Ground Potential (Output s & D/O Only)........ -0.5V to VCC + 0.5V DC Input Voltage ...................................................................................... -0.5V to VCC + 0.5V DC Output Current ...................................................................... 20mA Power Dissipation .............................................................................................................500mW Note: Stresses greater than those listed under MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. Recommended operation conditions Symbol VCC TA Parameter Operating Voltage Operating temperature Min 4.2 0 Typ 4.7 25 Max 5.2 85 Unit V ć Electrical Characteristics Sym Parameter VCC VTH IOH IOL ICC FOSC Shunt Regulator output voltage Input threshold(RELAY/DISC) Output Source Current (RELAY/DISC) Output Sink Current (RELAY/DISC) Power supply current Frequency of internal oscillator Test Conditions VCC Condition ICC =1mA 5V 5V V OH=0.7V 5V V OL=0.5V 4.0V 5V - Min Typ Max Unit 4.2 0.3 -0.3 0.5 96 4.7 0.35 -0.5 128 5.2 0.4 -1 0.5 160 V V mA mA mA KHz Block Diagram ACSEL Reference circuit VCC Clock extracting circuit Shunt Regulator Internal RC Oscillator GND Button sampling circuit RELAYdriving circuit PBO DISC RELAY Timer Chain 15/30/45/60m/90m/2h/4h/8h 2013-12-0013 PT0266-5 2 01/03/14 PT8A2524-26/34-36/44-46 Universal Timer Controller ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| Functional Description (Note: In below description, “RELAY” presents a pin, while “relay” means a device.) Ɣ Clock extracting circuit DISC is active VCC is not only the power supply pin but also clock source for internal precise timer. With the help of the external circuit, the AC 50/60Hz clock signal can be extracted to be used as timer clock source. Ɣ DISC For PT8A2525/2535 one button (ON/OFF) „ „ „ „ „ Button sampling circuit „ „ „ „ „ „ Ɣ RELAY driving circuit Button is tied to RELAY pin, once ON, once OFF. Pressing button ON/OFF to turn on/off relay and start/reset internal timer. RELAY is active when the button is pressed at first time. DISC is active when the button is pressed at second time. DISC outputs Low when relay is ON. For PT8A2526/2536 two buttons (ON, OFF) Button tied to DISC pin is for ON, Button tied to RELAY pin is for OFF. Pressing button ON to turn on relay and start internal timer. Pressing button OFF to turn off relay and reset internal timer. RELAY is active when button ON is pressed. DISC is active when button OFF is pressed. DISC will output a narrow pulse each 8ms when relay is ON. Buzzer For PT8A2524/25/34/35/44/45, a buzzer will make 0.5s sound with a frequency of 4KHz every 1s for 6 times after internal timer times out. Pin DISC will output 4KHz with 25% duty for 0.5s to let the buzzer work, then output 32KHz with 25% duty for 0.5s, after the output 6 times 4KHz, DISC will keep output 32KHz. RELAY driving signal is special, anytime, first 8ms is always high following output pulse signal with about 32KHZ and 25% duty cycle. DISC is used to limit the voltage of external high voltage capacitor by discharging it with a NPN transistor. After power on, DISC should be active during first 1s before RELAY in order to charge the external high voltage capacitor. RELAY is active to output first 8ms high following 32KHz with 25% duty cycle. When relay is OFF, RELAY will output a narrow pulse each 8ms, while, DISC is active to output 32KHz with 25% duty cycle. „ „ 8ms Timer chain Button sampling circuit senses button’s operation 3 times per 8ms. System will sample the button’s operation during first 100ms after power on, if buttons are pressed during this period, then system will start 3s timer to check if the chip will enter into quick test mode (see test mode section). If the related button is pressed over 3s just after power on, chip will enter quick test mode as soon as the button is released. If buttons are not pressed during first 100ms, system will operate normally. „ „ 8ms Driving signals of RELAY and DISC With external buttons, ON/OFF/RESET function can be realized. User can select one button with once ON, once OFF or two buttons to turn ON or OFF separately, also use one button to restart timer. Ɣ 8ms RELAY is active Internal RC oscillator circuit Timer chain can be used to generate various timer including 15/30/45/60/90/120/240/480min. Ɣ 8ms RELAY It is employed to create pulse driving signal for RELAY, it is a completely internal RC oscillator with frequency of about 128KHZ. Ɣ 8ms 32KHz with 25% duty Ɣ Quick Test Mode(QTM) In order to make the manufacturer’s test convenient, quick test mode is designed to speed up the test. QTM can be accessed by pressing button (ON or RESET) over 3s (option 2s) once power on. It can exit automatically after quick test timer is expired, system needs to power on again to come back normal operation after quick test mode. Any button operations will be ignored in QTM. For PT8A2524/2534 one button (RESET) Button is tied to RELAY pin. Pressing button RESET to turn on relay and restart internal timer. RELAY is active once the button is released. DISC will output low when relay is ON. Note: For PT8A2526/2536, the button to be pressed over 3s to enter into QTM is OFF. 2013-12-0013 PT0266-5 3 01/03/14 PT8A2524-26/34-36/44-46 Universal Timer Controller ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| Operation illustration of entering into and exiting Quick test mode Compare Table: Real timer and QTM timer Real Timer 15m 30m 45m 60m 90m 120m 4h 8h Power on >3s First PB ON sampling time