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M5295AL Datasheet(PDF) 6 Page - Renesas Technology Corp |
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M5295AL Datasheet(HTML) 6 Page - Renesas Technology Corp |
6 / 13 page M5295AL/AP/AFP REJ03D0780-0200 Rev.2.00 Jun 15, 2007 Page 6 of 12 • Pin (1) (WD pin) input requirements (1) Connect capacitor between WD pin and voltage input. (refer to section 3) (2) Input cycle: tWD or less (discharge should start before voltage at WD pin reaches 4 V.) 1 1.1 ⋅ C ⋅ R1 < f (3) Input pulse width tWDIN: t2 or less 234 t2 t t1 0.5 ms C = 104 1ms 50 µs C = 103 100 µs VCC = 5V R1 = 10kΩ Discharge Voltage x(V) Figure 4 3. Relationship between input pulse width and input capacitance Cin When input to pin (1) is 1.5 V or more, TC pin discharges electricity. Determine pulse width and input capacitance Cin with reference to the diagram shown in figure 5. t3 = Cin ⋅ 5 × 10 4 ⋅ ln RST1 is output when t4 is longer than tWD. Vin 1.5 Q1 is off when voltage at pin (1) is 1.5V or less. VIN 1Q1 30k Cin 20k t3 t4 tWD 4V Cin: 10000pF, t3 = 0.6ms Cin: 1000pF, t3 = 60µs Cin: 100pF, t3 = 6µs VIN WD (1) Vin Vin 1.5V 2V t t t t TC (2) RST1 (3) When t3 is too long, TC pin output waveform frequency changes as shown above. Set t3 to be sufficiently long to turn on Q1 [tWDIN(3µs) or more] but not to exceed t2 (discharge time). (t2: Discharge time during normal input) Figure 5 |
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