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TLE4275V33 Datasheet(PDF) 7 Page - Infineon Technologies AG |
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TLE4275V33 Datasheet(HTML) 7 Page - Infineon Technologies AG |
7 / 12 page TLE 4275 V33 Block Description and Electrical Characteristics Datasheet 7 Rev. 1.1, 2015-01-15 3.3 Reset Function The reset function contains serveal features: Output Undervoltage Reset: An output undervoltage condition is indicated setting the Reset Output “RO” to low. This signal might be used to reset a microcontroller during low supply voltage. In case the battery voltage is already lower than the buffered output voltage V Q of the voltage regulator, the reset circuit is supplied from the output “Q”, ensuring a defined reset switching threshold also at V I = 0 V. The Reset Output “RO” is held “low” down to an output voltage of V Q = 1 V, even if the input voltage VI is 0 V. Power-On Reset Delay Time: The power-on reset delay time t d,PWR-ON allows a microcontoller and oscillator to start up. This delay time is the time period from exceeding the reset switching threshold V RT until the reset is released by switching the reset output “RO” from “low” to “high”. The power-on reset delay time t d,PWR-ON is defined by an external delay capacitor C D connected to pin “D” which is charged up by the delay capacitor charge current ID,ch starting from V D = 0 V. For easy calculating the power-on reset delay time, a multiplier factor F d,PWR-ON = td,PWR-ON / CD is specified. Hence, t d,PWR-ON becomes: t d,PWR-ON = Fd,PWR-ON / CD . (1) For a precise calculation consider also the delay capacitor’s tolerance. Undervoltage Reset Delay Time: Unlike the power-on reset delay time, the undervoltage reset delay t d time considers a short output undervoltage event where the delay capacitor C D is assumed to be discharged to VD = VDST,lo only before the charging sequence restarts. Therefore, the undervoltage reset delay time t d is defined by the delay capacitor charge current ID,ch starting from V D = VDST,lo and the external delay capacitor CD. For easy calculating the undervoltage reset delay time, a multiplier factor F d = td / CD is specified. Hence, td becomes: t d = Fd / CD . (2) For a precise calculation consider also the delay capacitor’s tolerance. Reset Reaction Time: The total reset reaction rime t rr,total considers the internal reaction time trr,int and the discharge time trr,d defined by the external delay capacitor C D (see typical performance graph for details). Hence, the total reset reaction rime becomes: t rr,total = t rr,int + trr,d . (3) Reset Output “RO” Low for V Q ≥ 1V: In case of an undervoltage reset condition reset output “RO” is held “low” for V Q ≥ 1 V, even if the input voltage VI is 0 V. This is achieved by supplying the reset circuit from the output capacitor. |
Similar Part No. - TLE4275V33_15 |
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Similar Description - TLE4275V33_15 |
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