Electronic Components Datasheet Search |
|
IMP705CUA Datasheet(PDF) 7 Page - IMP, Inc |
|
IMP705CUA Datasheet(HTML) 7 Page - IMP, Inc |
7 / 9 page © 1999 IMP, Inc. 408-432-9100/www.impweb.com 7 IMP705/6/7/8, 8 IMP705/6/7/8, 8113L 3L Monitoring Voltages Other Than VCC The IMP705-708 can monitor voltages other than VCC using the Power Fail circuitry. If a resistive divider is connected from the voltage to be monitored to the Power Fail input, PFI, the PFO (output) will go LOW if the divider voltage goes below its 1.25V reference. Should hysteresis be desired, connect a resistor (equal to approximately 10 times the sum of the two resistors in the divider) between the PFI and PFO pins. A capacitor between PFI and GND will reduce circuit sensitivity to input high-frequency noise. If it is desired to assert a RESET in addition to the PFO flag, this may be achieved by connecting the PFO output to MR. Monitoring a Negative Voltage The Power-Fail circuitry can also monitor a negative supply rail. When the negative rail is OK, PFO will be LOW, and when the negative rail is failing (not negative enough), PFO goes HIGH (the opposite of when positive voltages are monitored). To trigger a reset, these outputs need to be inverted: adding the resistors and transistor as shown achieves this. The RESET output will then have the same sense as for positive voltages: good = HIGH, bad = LOW. It should be noted that this circuit’s accuracy depends on the VCC line, the PFI threshold tolerance, and the resistors. IMP70x VCC = 5V VIN = 12V GND VCC RESET To Processor 12V Threshold ~10.87V PFO MR PFI 1M 9 130k 9 705_07.eps IMP70x + — +5V Negative Input Voltage GND VCC RESET PFO MR PFI RP RN 705_09.eps 5 1 25 1 25 − = − .. RP V RN TRIP Application Information Figure 4. Monitoring Voltages Other Than VCC Figure 5. Monitoring a Negative Voltage |
Similar Part No. - IMP705CUA |
|
Similar Description - IMP705CUA |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |