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UCC3946D Datasheet(PDF) 8 Page - Texas Instruments |
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UCC3946D Datasheet(HTML) 8 Page - Texas Instruments |
8 / 17 page UCC2946 UCC3946 SLUS247F − APRIL 1997 − REVISED NOVEMBER 2007 8 www.ti.com APPLICATION INFORMATION CONNECTING WDO TO RES In order to provide design flexibility, the reset and watchdog circuits in the UCCx946 have separate outputs. Each output independently drives high or low, depending on circuit conditions explained previously. In some applications, it may be desirable for either the RES or WDO to reset the microprocessor. This can be done by connecting WDO to RES. If the pins try to drive to different output levels, the low output level dominates. Additional current flows from VDD to GND during these states. If the application cannot support additional current (during fault conditions), RES and WDO can be connected to the inputs of an OR gate whose output is connected to the microprocessor’s reset pin. LAYOUT CONSIDERATIONS A 0.1- µF capacitor connected from VDD to GND is recommended to decouple the UCCx946 from switching transients on the VDD supply rail. Since RP and WP are precision current sources, capacitors CRP and CWP should be connected to these pins with minimal trace length to reduce board capacitance. Care should be taken to route any traces with high voltage potential or high speed digital signals away from these capacitors. Resistors R1 and R2 generally have a high ohmic value, traces associated with these parts should be kept short in order to prevent any transient producing signals from coupling into the high impedance RTH pin. TYPICAL CHARACTERISTICS Figure 5. THRESHOLD RESISTANCE vs AMBIENT TEMPERATURE TA − Ambient Temperature − °C −55 1.22 1.20 −35 −15 5 25 45 65 85 105 125 1.21 1.25 1.23 1.24 1.26 VDD = 5 V 2 10.0 9.0 345 6 9.5 11.5 10.5 11.0 12.0 Figure 6. VDD − Input Voltage − V INPUT CURRENT vs INPUT VOLTAGE |
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