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M5295AL Datasheet(PDF) 6 Page - Renesas Technology Corp

Part # M5295AL
Description  Watchdog Timer
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

M5295AL Datasheet(HTML) 6 Page - Renesas Technology Corp

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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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