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TLE42754D 数据表(PDF) 15 Page - Infineon Technologies AG |
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TLE42754D 数据表(HTML) 15 Page - Infineon Technologies AG |
15 / 24 page Data Sheet 15 Rev. 1.0, 2008-05-29 TLE42754 Block Description and Electrical Characteristics 5.3 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 5.3.6, the delay capacitor’s value can be derived from the specified values in Item 5.3.6 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 Reset Output Pull-Up Resistor R RO: The Reset Output RO is an open collector output requiring an external pull-up resistor to a voltage V IO, e.g. VQ. In Table “Electrical Characteristics Reset Function” on Page 18 a minimum value for the external resistor R RO is given for the case it is connected to V Q or to a voltage VIO < VQ. If the pull-up resistor shall be connected to a voltage V IO > VQ, use the following formula: CD trd new , trd ---------------- 47nF × = trr trd int , trr d , + = RRO 5k Ω VQ ----------- V IO × = |
类似零件编号 - TLE42754D |
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类似说明 - TLE42754D |
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