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ICL7665S Datasheet(PDF) 11 Page - Intersil Corporation |
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ICL7665S Datasheet(HTML) 11 Page - Intersil Corporation |
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11 / 14 page  11 FN3182.8 April 5, 2006 Simple High/Low Temperature Alarm Figure 16 illustrates a simple high/low temperature alarm which uses the ICL7665S with an NPN transistor. The voltage at the top of R1 is determined by the VBE of the transistor and the position of R1’s wiper arm. This voltage has a negative temperature coefficient. R1 is adjusted so that VSET2 equals 1.3V when the NPN transistor’s temperature reaches the temperature selected for the high temperature alarm. When this occurs, OUT2 goes low. R2 is adjusted so that VSET1 equals 1.3V when the NPN transistor’s temperature reaches the temperature selected for the low temperature alarm. When the temperature drops below this limit, OUT1 goes low. AC Power Fail and Brownout Detector Figure 17 shows a circuit that detects AC undervoltage by monitoring the secondary side of the transformer. The capacitor, C1, is charged through R1 when OUT1 is OFF. With a normal 100 VAC input to the transformer, OUT1 will discharge C1 once every cycle, approximately every 16.7ms. When the AC input voltage is reduced, OUT1 will stay OFF, so that C1 does not discharge. When the voltage on C1 reaches 1.3V, OUT2 turns OFF and the power fail warning goes high. The time constant, R1C1, is chosen such that it takes longer than 16.7ms to charge C1 1.3V. HYST1 VSET1 VSET2 HYST2 V+ OUT1 OUT2 5.86k Ω 130k Ω BACKUP BATTERY 7805 5V REGULATOR UNREGULATED DC INPUT 1M Ω 22M Ω 2.2M Ω 1M Ω 715k Ω 1M Ω RESET OR WRITE ENABLE POWER FAIL WARNING 470 µF 4700 µF ICL7665S FIGURE 15. POWER FAIL WARNING AND POWERUP/POWERDOWN RESET ICL7665S |
Similar Part No. - ICL7665S_06 |
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Similar Description - ICL7665S_06 |
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