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:
4
⋅
V
CC
5
TC
0V
t
WD
t
RST(1)
t
RST(2)
2
⋅
V
CC
5
t
RST(1)
= 0.51
⋅
C
⋅
R
1
t
WD
= 1.1
⋅
C
⋅
R
1
(charge time)
R
1
4
⋅
–1
1000
t
RST(2)
= 1000
⋅
C
⋅
ln
(discharge time)
R
1
2
⋅
–3
1000
2
V
CC
R
1
Resistance R
1
: 10kΩ
≤
R
1
≤
30kΩ
When R
1
is 10kΩ, t
RST(2)
is 830
⋅
C
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:
(V
CC
= 5V)
4V
Pin (2)
xV
2V
t
1
t
2
Input
t
WDIN
t
1
= C
⋅
R
1
⋅
ln
3
5–x
(
R
1
+ 1) x – 5
1000
2
⋅
R
1
– 3
1000
(charge time)
t
2
= 1000
⋅
C
⋅
ln
(discharge time)
Figure 3
REJ03D0780-0200 Rev.2.00 Jun 15, 2007
Page 5 of 12
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