SX8124 24 hours timer synchronized on 50/60Hz mains ADVANCED COMMUNICATIONS & SENSING DATASHEET Features Description The SX8124 is 24 hours timer with an analog programmable duty cycle that synchonizes on European standard (220V/50Hz) and US standard (110V/60Hz) mains for high timing precision without calibration or resonator. The SX8124 starts counting time when connected to the mains, its internal counter can be reset on the press of a button (optional) or by setting the duration to zero. The SX8124 duty cycle is set using one single resistive divider. Its output can be forced on or off with the press of the optional button. 24 hours timer synchronized on mains frequency Analog period setting Automatic 50 Hz and 60 Hz detection Simplest usage Manual on/off/reset option LED status option Applications Mosquito repellent Odor killers SX8124 outputs are complementary to simplify the connection of switches and an optional LED can confirm the timer status. Illuminated decoration Xmas animation Ordering Information Part number Function Package SX8124ISTRT 24 hours timer SOIC-8 - Available in tape and reel only - WEEE/RoHS compliant. Pb-Free and Halogen Free. Functional Bloc Diagram 1.2 – 2.0 V supply Reg SX8124 ADC PHASE SYNC START DEBOUNCE LED BURST VDD CONTROL DURATION 24 hours duration OUT VSS Start Timer ON/OFF outputs LED blink: Once every 5 sec: off Twice every 5 sec: on 2 Hz: ‘‘no synch’’ error ACS - Revision 2.4 © Semtech Corp. October 2010 Page 1 NOUT www.semtech.com/products/ SX8124 24 hours timer synchronized on 50/60Hz mains ADVANCED COMMUNICATIONS & SENSING DATASHEET TABLE OF CONTENT Section Page ELECTRICAL SPECIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1 2 2.1 2.2 Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Circuit specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 4 4 4 TECHNICAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3 3.1 3.2 4 4.1 4.2 4.3 5 6 6.1 6.2 7 8 8.1 8.2 9 9.1 9.2 10 10.1 10.2 10.3 Pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Digital input levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Pin states . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Safe mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Low voltage mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Active mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 System architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 24h Timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Operating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Debounce on START pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Setting duration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Timer synchronization on a 50Hz or 60Hz external phase. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 External phase available for synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 No phase available for synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Timer reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Reset with the START pin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Reset with the DURATION pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 LED output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Synchronized on phase, outputs ON . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Synchronized on phase, outputs OFF. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Not synchronized on phase. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 APPLICATION EXAMPLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 11 11.1 11.2 Complete application schematics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 LED boosters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Low cost LED output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 MECHANICAL SPECIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 12 12.1 12.1.1 12.1.2 12.1.3 Packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SOIC-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Outline drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Land pattern. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Marking information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ACS - Revision 2.4 © Semtech Corp. October 2010 Page 2 20 20 20 21 22 www.semtech.com/products/ SX8124 24 hours timer synchronized on 50/60Hz mains ADVANCED COMMUNICATIONS & SENSING DATASHEET ELECTRICAL SPECIFICATION 1 Absolute Maximum Ratings Note Table 1. The Absolute Maximum Ratings, in table below, are stress ratings only. Functional operation of the device at conditions other than those indicated in the Operating Conditions sections of this specification is not implied. Exposure to the absolute maximum ratings, where different to the operating conditions, for an extended period may reduce the reliability or useful lifetime of the product. Absolute maximum ratings Parameter Symbol Min Max Unit Supply Voltage VAMRVDD -0.3 2.5 V Pin Voltage (non-supply pins) VAMRVIN VSS - 0.3 VDD + 0.3 V Sink or source current on any pin IAMRISS -100 100 mA Storage Temp TSTOR -50 +150 °C ESD conditions ACS - Revision 2.4 © Semtech Corp. HBM ESDHBM 4000 V CDM ESDCDM 1000 V MM ESDMM 200 V October 2010 Page 3 www.semtech.com/products/ SX8124 24 hours timer synchronized on 50/60Hz mains ADVANCED COMMUNICATIONS & SENSING 2 Specifications 2.1 Operating Conditions Note Table 2. DATASHEET Circuit operates within the Supply Voltage Range VDD-VSS = VDDOC. The specification is verified within the Full Spec Voltage Range VDD-VSS = VDDSPEC. Operating range Parameter Symbol Min Max Unit Supply Voltage Range VDDOC 0.9 2.0 V Full Spec Voltage Range VDDSPEC 1.0 1.8 V Ambient Temperature TOC -40 +85 °C 2.2 Circuit specification Note Table 3. Conditions: Temperature within TOC and VDD-VSS within VDDSPEC, unless otherwise stated. Circuit electrical specification Parameter Symbol Typ Max Unit VSAFE 0.6 0.7 V Threshold VPOR 0.9 V Hysteresis VPORHYST 150 mV Safe mode low limit Min POR voltage Switch ON level VON T : 0 to 70°C Switch OFF level 0.95 1.05 1.15 V 0.85 0.95 1.00 V 0.85 0.95 1.05 V VOFF T : -40 to 85°C VDD VON VOFF VPOR VPORHYST VSAFE time Mode : ACS - Revision 2.4 © Semtech Corp. Safe Low Batt October 2010 ON : Active or Sleep Page 4 Low Batt Safe www.semtech.com/products/ SX8124 24 hours timer synchronized on 50/60Hz mains ADVANCED COMMUNICATIONS & SENSING Table 4. Circuit power consumption specifications Parameter Supply current in Timer Active mode (outputs no loaded... Symbol Min VDD=2.0V Typ Max VDD=1.2V ILV Supply current in Safe mode ISAFE Unit 30 μA 19 μA IACTIVE Supply current in Low Voltage mode Table 5. DATASHEET 10 30 μA 10 μA Max Unit Digital IOs specifications Parameter Symbol Min Typ Startup time at power-on tSTART Output High Voltage VOH 3/4 VDD VDD V Output Low Voltage VOL VSS 1/4 VDD V 0.1 s VDD = 0.9 V IOH09 4 mA VDD >= 1.2 V IOH12 10 mA VDD = 0.9 V IOL09 4 mA VDD >= 1.2 V IOL12 10 mA Max Source Current at min VOH Max Sink Current at max VOL Input capacitance Table 6. CI 10 pF Max Unit General specifications Parameter Symbol Min Typ Time to synchronize on mains frequency TSynch 250 ms Minimal time of active button to reset internal counter TReset 3 s Pull-up resistor on START RPULL ACS - Revision 2.4 © Semtech Corp. October 2010 Page 5 30 100 kOhm www.semtech.com/products/ SX8124 24 hours timer synchronized on 50/60Hz mains ADVANCED COMMUNICATIONS & SENSING DATASHEET TECHNICAL DESCRIPTION 3 Pinout Table 7. 1. SOIC-8 pinout Pin# Pin name Pin type Pin function Reset 1 DURATION Analog input Analog input to set duty cycle.1 High impedance 2 PHASE Digital input Input for phase and frequency detection High impedance 3 START Digital input Optional button to reset counter or switch output pull up 4 LED Digital output Optional LED pulses VSS 5 NOUT Digital output Output, low when active VSS 6 VSS Power ground Negative supply and IC ground Negative supply 7 OUT Digital input Output, high when active VDD 8 VDD Power positive Positive supply Positive supply In active mode, input impedance on DURATION pin is 500k min, 750k typical and 1000k max. 1 8 DURATION VDD PHASE OUT START VSS LED NOUT Figure 1. SOIC-8 pinout ACS - Revision 2.4 © Semtech Corp. October 2010 Page 6 www.semtech.com/products/ SX8124 24 hours timer synchronized on 50/60Hz mains ADVANCED COMMUNICATIONS & SENSING 3.1 DATASHEET Digital input levels Input thresholds levels scale with VDD. Inputs have an hysteresis based on a Schmitt trigger schematics. VIL, VIH vs VDD 2 1.5 Threshold VDD 1 VIH 0.5 VIL 0 0.8 1 1.2 1.4 1.6 1.8 2 VDD Figure 2. Input level scales with VDD 3.2 Pin states Table 8. Pinout vs Power mode Pin state Pin# Pin name Pin type Safe mode Low voltage mode Active mode 1 DURATION Analog input High impedance High impedance High impedance 2 PHASE Digital input High impedance High impedance High impedance 3 START Digital input High impedance pull up pull up 4 LED Digital output High impedance VSS 43kHz burst or VSS 5 NOUT Digital output High impedance VSS VSS or VDD 6 VSS Power ground Negative supply Negative supply Negative supply 7 OUT Digital input High impedance VDD VSS or VDD 8 VDD Power positive Positive supply Positive supply Positive supply ACS - Revision 2.4 © Semtech Corp. October 2010 Page 7 www.semtech.com/products/ SX8124 24 hours timer synchronized on 50/60Hz mains ADVANCED COMMUNICATIONS & SENSING 4 DATASHEET Power Modes VDD 1.05V IOs ON 0.95V IOs OFF 0.9V Timer ON / OFF Hysteresis 0.6V LOW VOLTAGE Safe ACTIVE SAFE LOW VOLTAGE SAFE 0V time Figure 3. Operating modes vs VDD voltage 4.1 Safe mode The internal system goes in Safe mode as soon as the VDD voltage is above 0.6-0.7V. In this mode all pins are set in high impedance and are inactive. This guarantees a safe start-up. 4.2 Low voltage mode The internal 24h timer and phase detection/synchronization functions are active. All input ( BUTTON, PHASE, DURATION ) pins functionalities remains active but will not activate the outputs. All outputs are forced to a default static state as follows: OUT pin is forced high NOUT pin is forced low LED pin is low 4.3 Active mode The outputs are active and set according to the device internal states: OUT and NOUT pin active (see “Operating” on page 10) LED pin sending 250ms bursts (see “LED output” on page 15) ACS - Revision 2.4 © Semtech Corp. October 2010 Page 8 www.semtech.com/products/ SX8124 24 hours timer synchronized on 50/60Hz mains ADVANCED COMMUNICATIONS & SENSING 5 DATASHEET System architecture The system is based on its internal timer to track frequency and to disciminate 50 Hz vs 60 Hz supply. If there is no input on PHASE pin, the system timing will use the internal oscillator (10% precise). Set duration ADC DURATION VDD Reset ‘0’ detect PHASE 60 Hz detect OUT 50 Hz detect 24H TIMER RC Oscillator START Debounce LED Output control Reset 3s detect Burst gen VSS NOUT Figure 4. SX8124 Architecture Once the system is locked on the mains phase, its time precision is given by the mains frequency precision. The period of the output signal on OUT and NOUT is 24 hours. The duty cycle on these pins is equal to the relative voltage on pin DURATION version the voltage on pin VDD. If DURATION is 1/3 of VDD, OUT will be high for 8 hours and down for 16 hours. Remark that when the OUT state is manually modified using the START pin, this does not influence the internal counter: the OUT (and NOUT) pins will continue to be switched “on” at the end of the 24 hours cycle and “off” after the programmed duty cycle. The LED outputs is a signal indicating the internal chip status (see 10. LED output). ACS - Revision 2.4 © Semtech Corp. October 2010 Page 9 www.semtech.com/products/ SX8124 24 hours timer synchronized on 50/60Hz mains ADVANCED COMMUNICATIONS & SENSING 6 24h Timer 6.1 Operating DATASHEET OUT NOUT toggle at set duration 24h cycle start timer (re)start Next 24h cycle Figure 5. Outputs waveforms during the 24 h cycle The pin START is used to change the OUT (and NOUT) state. A short pulse (below 1 second) on this pin manually changes the OUT and NOUT state (Figure 6). A long pulse (around 3 seconds or more) resets the system and restarts the synchronization of the chip on its PHASE input. Short low pulse Short low pulse START OUT NOUT start timer pin toggle pin toggle 24h cycle (re)start Next 24h cycle Figure 6. Outputs toggling pushing START pin down during less than 1 second 6.2 Debounce on START pin The START pin is active low. For a start/stop command detection, the voltage on the START pin must be maintained low during 10ms. Then, a delay of 20ms is necessary before the next start/stop command. This allow to remove wrong start/stop commands due to oscillations when using of low-cost push buttons. ACS - Revision 2.4 © Semtech Corp. October 2010 Page 10 www.semtech.com/products/ SX8124 24 hours timer synchronized on 50/60Hz mains ADVANCED COMMUNICATIONS & SENSING 7 DATASHEET Setting duration The measurement of DURATION pin voltage is ratiometric to VDD. The 24h duty cycle on OUT and NOUT pins is equal to the relative voltage on pin DURATION versus the voltage on pin VDD. For example if DURATION is 1/3 of VDD, OUT will be high for 8 hours and down for 16 hours. The voltage resolution on the DURATION pin is 256, so the OUT and NOUT pin can toggle at each step of 24H / 256 = 5.625 minutes. VDD 256 DURATION 128 0 SX8124 VDD VSS VSS Figure 7. 256 steps resolution on DURATION pin OUT NOUT toggle at set duration 24h cycle start timer Step 0 Step 128 (re)start Next 24h cycle Step 256 Figure 8. 256 steps on the 24H timer cycle Steps 0 to 2 on the DURATION pin are reserved for detection of a Reset command with the pin set to ground. The timer can not be set to toggle OUT and NOUT during the 15 first minutes after the start of the 24H cycle. See “Reset with the DURATION pin” on page 14 . While the duration is set to ‘0’, the LED pin is not active and set to VSS. ACS - Revision 2.4 © Semtech Corp. October 2010 Page 11 www.semtech.com/products/ SX8124 24 hours timer synchronized on 50/60Hz mains ADVANCED COMMUNICATIONS & SENSING 8 DATASHEET Timer synchronization on a 50Hz or 60Hz external phase To avoid timing drifts over the time, the SX8124 can be synchronised on a signal from the mains. The SX8124 permanently checks the duration between two consecutive edges on the PHASE pin. 8.1 External phase available for synchronization If OUT and NOUT are on : 60 Hz detect 50 Hz signal Burst gen 50 Hz detect PHASE 24H TIMER RC Oscillator LED If OUT and NOUT are off : Output control Figure 9. Example: timer synchronized on a 50Hz phase Please note that for correct phase detection the edges on the PHASE pin must be sharp . A sinus or triangular wave is not recommended. 8.2 No phase available for synchronization If there is no clean 50Hz or 60Hz signal on PHASE pin, the system timing switch on the internal RC oscillator. In this case the timer will be 10% precise. The LED output is sending 2Hz burst to indicate that the timer is not synchronized and counting based on the internal base time. 60 Hz detect No signal or noise Burst gen 50 Hz detect PHASE 24H TIMER RC Oscillator LED Output control Figure 10. Timer not synchronized on an external phase The maximum frequency on PHASE pin should not exceed 20kHz. If the signal on this pin has a frequency potentially higher than 20kHz it must be low pass filtered with a capacitor. ACS - Revision 2.4 © Semtech Corp. October 2010 Page 12 www.semtech.com/products/ SX8124 24 hours timer synchronized on 50/60Hz mains ADVANCED COMMUNICATIONS & SENSING 9 Timer reset 9.1 Reset with the START pin DATASHEET A button can be connected between the BUTTON pin and VSS. Holding START down during 3 seconds or more resets the 24 hours timer and the system. Pressing shortly the button changes the output state without modifying the internal counter. SX8124 VDD > 3 seconds START VSS Figure 11. Timer reset with the START button Long pulse Long pulse START OUT NOUT start timer (re)start timer (re)start Toggle at set duration 24h cycle Figure 12. Manual reset holding START pin down during 3 seconds or more ACS - Revision 2.4 © Semtech Corp. October 2010 Page 13 www.semtech.com/products/ SX8124 24 hours timer synchronized on 50/60Hz mains ADVANCED COMMUNICATIONS & SENSING 9.2 DATASHEET Reset with the DURATION pin Moving the DURATION voltage to 0V and then moving it back to the desired duration will reset the 24 hours timer. This can be done either with a switch in parallel with the DURATION resistive divider or if this divider is made with a potentiometer by turning this potentiometer to 0 leaving it there for a few seconds and then bring it back to the desired position. 12h DURATION 6h SX8124 VDD 18h VSS 0h 24h Figure 13. Timer reset by pushing DURATION pin to ground DURATION OUT NOUT reset start (re)start toggle at set duration 24h cycle Figure 14. Manual reset moving DURATION pin voltage down to 0V The voltage on DURATION pin remains ratiometric to VDD while VDD is below 1.8V. Additionally, if the voltage on DURATION pin exceeds |1.8V| the timer is reinitialized. ACS - Revision 2.4 © Semtech Corp. October 2010 Page 14 www.semtech.com/products/ SX8124 24 hours timer synchronized on 50/60Hz mains ADVANCED COMMUNICATIONS & SENSING 10 DATASHEET LED output The LED output is used to indicate the status of the internal system. The LED signal is made of bursts of 4 us pulses with a period of 30 us and total duration of 250 ms. This makes possible to activate a LED even at very low voltage. To indicate that OUT is high, the LED sends two bursts separated by 500 ms every 5 seconds. To indicate that OUT is low, the LED send one burst every 5 seconds. To indicate that the system is not synchronized (no PHASE detected, or frequency measured on PHASE outside 50-60 Hz, at start-up or after a manual reset), the LED continuously sends bursts separated by 250 ms. 10.1 Synchronized on phase, outputs ON When synchronized, the LED indicates the OUT pin status. The first pulse occurs 5 seconds after a POR, timer startup or timer reset, OUT NOUT LED 250ms 500ms 250ms 5s 250ms 250ms 500ms Figure 15. Dual pulse 10.2 Synchronized on phase, outputs OFF The first pulse occurs 5 seconds after a POR, timer startup or timer reset, OUT NOUT LED 250ms 5s 250ms 5s Figure 16. Single pulse ACS - Revision 2.4 © Semtech Corp. October 2010 Page 15 www.semtech.com/products/ SX8124 24 hours timer synchronized on 50/60Hz mains ADVANCED COMMUNICATIONS & SENSING 10.3 DATASHEET Not synchronized on phase OUT NOUT LED 250ms 250ms Figure 17. Continuous pulses ACS - Revision 2.4 © Semtech Corp. October 2010 Page 16 www.semtech.com/products/ SX8124 24 hours timer synchronized on 50/60Hz mains ADVANCED COMMUNICATIONS & SENSING DATASHEET APPLICATION EXAMPLES 11 Complete application schematics 200 V supply 91 kOhm 200V 91 kOhm 200V 1.5 – 2.0 V supply 15 kOhm 11 W Heater 1.2 V 1.5 mA 50 kOhm 150 uF 0Ohms 25 mA SX8124 DURATION ADC VDD 1 kOhm PHASE SYNC START DEBOUNCE LED BURST GEN CONTROL 51 kOhm 50 uA 27 nF 3.9 MOhm OUT 500 uA VSS MSPA44 W < 300 mW IC < 300 mA B = 50 VC < 300 V VB < 6V NOUT Figure 18. Application schematics with low-power sleep mode (below 0.3 W) The circuit can be directly powered from the mains through a diode bridge and a resistor as long as the supply voltage is limited at ~1.2V by diodes or similar devices. The choice of the resistor that limits the supply current must be made so that it delivers enough current for the system to supply the IC and any other device that is connected to that supply, but the resistor must be large enough to limit the current in sleep mode (120 kOhm will limit power dissipation below 0.3W on a 220V network). The RC filter on the power supply is there to reject 100 Hz or 120 Hz variations. The phase detector is used to increase the precision on the 24 hours counter. It is recommended to protect the pin with external diodes. The filter on the phase detector is there to reject high frequency perturbations (several kHz) but must let the 50 Hz or 60 Hz go through with limited attenuation. The timer element is a potentiometer. The total resitivity of the potentiometer must be low enough to avoid sensitivity to the DURATION pin impedance (> 500 kOhm) and high enough to limit current drift current. The voltage applied on the potentiometer is 1/100 of the voltage applied on the resistor that protects the supply voltage of the chip, therefore the current through these resistors will be in the same ratio if they have the same value. The power element (either a resistove heater for a diffuser or a motor for a ventilator) will be controlled through an NPN transistor. ACS - Revision 2.4 © Semtech Corp. October 2010 Page 17 www.semtech.com/products/ SX8124 24 hours timer synchronized on 50/60Hz mains ADVANCED COMMUNICATIONS & SENSING 11.1 DATASHEET LED boosters The chip sends bursts to trigger the LED. If the LED is supplied by the regulated voltage VDD it is expected to be connected to a transistor and in parallel with a coil to get enough voltage to light. 0.9 – 2.0 V Coil LED SX8124 VDD VSS LED Figure 19. Booster for red LED 0.9 – 2.0 V Coil SX8124 VDD VSS LED LED Figure 20. Booster for white/blue LED ACS - Revision 2.4 © Semtech Corp. October 2010 Page 18 www.semtech.com/products/ SX8124 24 hours timer synchronized on 50/60Hz mains ADVANCED COMMUNICATIONS & SENSING 11.2 DATASHEET Low cost LED output The schematic on Figure 21 below shows a LED driving without the usage of a coil to drive the LED, and also reduce the costs of the BOM. The Rlim, Rb resistors and the transistor hfe must be carefully choosed according to the LED and mains voltage. 100V or 200V 0.9 – 2.0 V Mains Rlim SX8124 VDD LED VSS Rb LED Figure 21. LED supplied by the mains ACS - Revision 2.4 © Semtech Corp. October 2010 Page 19 www.semtech.com/products/ SX8124 24 hours timer synchronized on 50/60Hz mains ADVANCED COMMUNICATIONS & SENSING DATASHEET MECHANICAL SPECIFICATION 12 Packages 12.1 SOIC-8 12.1.1 Outline drawing DIMENSIONS MILLIMETERS INCHES DIM MIN NOM MAX MIN NOM MAX A D e 2X E/2 E1 E 1 2 ccc C 2X N/2 TIPS .053 .069 .004 .010 .049 .065 .020 .012 .010 .007 .189 .193 .197 .150 .154 .157 .236 BSC .050 BSC .010 .020 .016 .028 .041 (.041) 8 0° 8° .004 .010 .008 A A1 A2 b c D E1 E e h L L1 N 01 aaa bbb ccc N e/2 B D 1.75 1.35 0.25 0.10 1.65 1.25 0.31 0.51 0.25 0.17 4.80 4.90 5.00 3.80 3.90 4.00 6.00 BSC 1.27 BSC 0.25 0.50 0.40 0.72 1.04 (1.04) 8 0° 8° 0.10 0.25 0.20 aaa C h A2 A SEATING PLANE C h A1 bxN bbb H C A-B D c GAGE PLANE 0.25 SEE DETAIL L (L1) A DETAIL SIDE VIEW 01 A NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. DATUMS -A- AND -B- TO BE DETERMINED AT DATUM PLANE -H3. DIMENSIONS "E1" AND "D" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. 4. REFERENCE JEDEC STD MS-012, VARIATION AA. ACS - Revision 2.4 © Semtech Corp. October 2010 Page 20 www.semtech.com/products/ SX8124 24 hours timer synchronized on 50/60Hz mains ADVANCED COMMUNICATIONS & SENSING DATASHEET 12.1.2 Land pattern This land pattern is for reference purposes only. Consult your manufacturing group to ensure your company’s manufacturing guidelines are met. X DIM (C) G Z Y C G P X Y Z DIMENSIONS INCHES MILLIMETERS (.205) .118 .050 .024 .087 .291 (5.20) 3.00 1.27 0.60 2.20 7.40 P NOTES: 1. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET. 2. REFERENCE IPC-SM-782A, RLP NO. 300A. ACS - Revision 2.4 © Semtech Corp. October 2010 Page 21 www.semtech.com/products/ SX8124 24 hours timer synchronized on 50/60Hz mains ADVANCED COMMUNICATIONS & SENSING DATASHEET 12.1.3 Marking information "#$ &&'' !"#$% &&''" !()(*% + !,)()% ACS - Revision 2.4 © Semtech Corp. October 2010 Page 22 www.semtech.com/products/ SX8124 24 hours timer synchronized on 50/60Hz mains ADVANCED COMMUNICATIONS & SENSING DATASHEET © Semtech 2010 All rights reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any license under patent or other industrial or intellectual property rights. Semtech assumes no responsibility or liability whatsoever for any failure or unexpected operation resulting from misuse, neglect improper installation, repair or improper handling or unusual physical or electrical stress including, but not limited to, exposure to parameters beyond the specified maximum ratings or operation outside the specified range. SEMTECH PRODUCTS ARE NOT DESIGNED, INTENDED, AUTHORIZED OR WARRANTED TO BE SUITABLE FOR USE IN LIFESUPPORT APPLICATIONS, DEVICES OR SYSTEMS OR OTHER CRITICAL APPLICATIONS. INCLUSION OF SEMTECH PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE UNDERTAKEN SOLELY AT THE CUSTOMER’S OWN RISK. Should a customer purchase or use Semtech products for any such unauthorized application, the customer shall indemnify and hold Semtech and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs damages and attorney fees which could arise. Notice: All referenced brands, product names, service names and trademarks are the property of their respective owners. Contact information Semtech Corporation Advanced Communications & Sensing Products E-mail: [email protected] or [email protected] Internet: http://www.semtech.com USA FAR EAST EUROPE 200 Flynn Road, Camarillo, CA 93012-8790. Tel: +1 805 498 2111 Fax: +1 805 498 3804 12F, No. 89 Sec. 5, Nanking E. Road, Taipei, 105, TWN, R.O.C. Tel: +886 2 2748 3380 Fax: +886 2 2748 3390 Semtech Ltd., Units 2 & 3, Park Court, Premier Way, Abbey Park Industrial Estate, Romsey, Hampshire, SO51 9DN. Tel: +44 (0)1794 527 600 Fax: +44 (0)1794 527 601 ISO9001 CERTIFIED ACS - Revision 2.4 © Semtech Corp. October 2010 Page 23 www.semtech.com/products/