M5295AL 데이터 시트보기 (PDF) - Renesas Electronics
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M5295AL Datasheet PDF : 13 Pages
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M5295AL/AP/AFP
1. Pin(2) (TC pin) charge time and discharge time
When input to WD pin is abnormal, TC pin output waveform is as shown below:
TC
0V
tWD
4
5
⋅ VCC
2
5
⋅ VCC
tRST(1)
tRST(2)
tRST(1) = 0.51 ⋅ C ⋅ R1
tWD = 1.1 ⋅ C ⋅ R1 (charge time)
4 ⋅ R1 – 1
tRST(2) = 1000 ⋅ C ⋅ ln
1000
2 ⋅ R1 – 3
(discharge time)
1000
VCC
R1
2
C
Resistance R1: 10kΩ ≤ R1 ≤ 30kΩ
When R1 is 10kΩ, tRST(2) is 830 ⋅ C
Figure 2
2. Pin (1) (WD pin) input frequency, input pulse width, charge time and discharge time
When input to WD pin is normal, TC pin output waveform is as shown below:
Pin (2) xV
t1 t2
(VCC = 5V)
4V
2V
Input
tWDIN
t1 = C ⋅ R1 ⋅ ln
3
5–x
( R1 + 1) x – 5
t2 = 1000 ⋅ C ⋅ ln
1000
2 ⋅ R1 – 3
1000
Figure 3
(charge time)
(discharge time)
REJ03D0780-0200 Rev.2.00 Jun 15, 2007
Page 5 of 12
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