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UCC3946D Datasheet(PDF) 5 Page - Texas Instruments |
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UCC3946D Datasheet(HTML) 5 Page - Texas Instruments |
5 / 17 page UCC2946 UCC3946 SLUS247F − APRIL 1997 − REVISED NOVEMBER 2007 5 www.ti.com APPLICATION INFORMATION PROGRAMMING THE RESET VOLTAGE AND RESET PERIOD The UCCx946 allows the reset trip voltage to be programmed with two external resistors. In most applications VDD is monitored by the reset circuit, however, the design allows voltages other than VDD to be monitored. Referring to Figure 2, the voltage below which reset is asserted is determined by: V RESET + 1.235 R1 ) R2 R2 In order to keep quiescent currents low, resistor values in the megaohm range can be used for R1 and R2. A manual reset can be easily implemented by connecting a momentary push switch in parallel with R2. RES is ensured to be low with VDD voltages as low as 1 V. UDG−98002 6 7 WDI WP 8 VDD 3 5 POWER TO CIRCUITRY WDO GND EDGE DETECT WATCHDOG TIMING 100 mV 2 RTH 4 RP 400 nA POWER ON RESET VDD RESET NMI I/O uP RES + − + − + − + − SQ Q R 1.235 V S Q QR R2 R1 400 nA 1.235 V A3 A2 A1 A0 CLK CLR 8−BIT COUNTER SQ Q R 1 CRP CWP Figure 2. Typical Application Diagram (1) |
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