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ICL8211 Datasheet(PDF) 14 Page - Harris Corporation |
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ICL8211 Datasheet(HTML) 14 Page - Harris Corporation |
14 / 14 page 7-174 ICL8211, ICL8212 SPST switches range from push button and slide types to cal- culator keyboards. A major problem with the use of switches is the mechanical bounce of the electrical contacts on closure. Contact bounce times can range from a fraction of a millisec- ond to several tens of milliseconds depending upon the switch type. During this contact bounce time the switch may make and break contact several times. The circuit shown in Figure 37 pro- vides a rapid charge up of C1 to close to the positive supply voltage (V1) on a switch closure and a corresponding slow dis- charge of C1 on a switch break. By proportioning the time con- stant of R1 C1 to approximately the manufacturer’s bounce time the output as terminal #4 of the ICL8211/8212 will be a single transition of state per desired switch closure Low Voltage Power Disconnect (Figure 38) There are some classes of circuits that require the power supply to be disconnected if the power supply voltage falls below a certain value. As an example, the National LM199 precision reference has an on chip heater which malfunc- tions with supply voltages below 9V causing an excessive device temperature. The ICL8212 may be used to detect a power supply voltage of 9V and turn the power supply off to the LM199 heater section below that voltage. For further applications, see AN027 “Power Supply Design using the ICL8211 and ICL8212.” FIGURE 36. FREQUENCY LIMIT DETECTOR FIGURE 37. SWITCH BOUNCE FILTER FIGURE 38. LOW VOLTAGE POWER SUPPLY DISCONNECT 1 2 3 4 8 7 6 5 R1 1 2 3 4 8 7 6 5 1 2 3 4 8 7 6 5 OUTPUT R6 ICL8211 OR ICL8212 #3 B R7 R5 A R2 R3 C2 C3 C1 INPUT R6 V+ R4 ON TIME #2 INPUT 1.15V A 1.15V B INDETERMINATE BELOW FO OFF ON FREQUENCY FO ON OFF TIME CONSTANT R3C2 < R4C2 ≤ R7C3 VARY R1 FOR OPTION ZERO CROSSING DETECTION VARY R4 TO SET DETECTION FREQUENCY ICL8212 ICL8212 1 2 3 4 8 7 6 5 V+ R3 R2 VO R1 C1 R4 100 Ω RL ICL8211 OR ICL8212 1 2 3 4 8 7 6 5 V- 500k 56k OUTPUT REFERENCE LM199 4.7k 3.9k ICL8212 |
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