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TLE42794 Datasheet(PDF) 17 Page - Infineon Technologies AG |
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TLE42794 Datasheet(HTML) 17 Page - Infineon Technologies AG |
17 / 28 page Data Sheet 17 Rev. 1.1, 2008-10-09 TLE42794 Block Description and Electrical Characteristics 5.6 Reset Function The reset function provides several features: Output Undervoltage Reset: An output undervoltage condition is indicated by setting the Reset Output RO to “low”. This signal might be used to reset a microcontroller during low supply voltage. Power-On Reset Delay Time: The power-on reset delay time t rd allows a microcontoller and oscillator to start up. This delay time is the time frame 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 rd is defined by an external delay capacitor CD connected to pin D charged by the delay capacitor charge current I D,ch starting from VD =0V. If the application needs a power-on reset delay time t rd different from the value given in Item 5.6.7, the delay capacitor’s value can be derived from the specified values in Item 5.6.7 and the desired power-on delay time: with • CD: capacitance of the delay capacitor to be chosen • trd,new: desired power-on reset delay time • t rd: power-on reset delay time specified in this datasheet For a precise calculation also take the delay capacitor’s tolerance into consideration. Reset Reaction Time: The reset reaction time avoids that short undervoltage spikes trigger an unwanted reset “low” signal. The reset reaction rime t rr 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 time becomes: with • trr: reset reaction time • trr,int: internal reset reaction time • t rr,d: reset discharge CD trd new , trd ---------------- 47nF × = trr trd int , trr d , + = |
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