M5295AL MITSUBISHI [Mitsubishi Electric Semiconductor], M5295AL Datasheet - Page 4

• Manufacturer Part Number: M5295AL
• Description: WATCHDOG TIMER
• Manufacturer: MITSUBISHI [Mitsubishi Electric Semiconductor]

1.Pin 2 (TC Pin) Charge Time and
TERMINOLOGY
Resistance R1:10k
When R1 is 10k ,t
t
t
t
RST
WD
RST
Discharge Time
t
t
t
When input to WD pin is abnormal,TC pin output
waveform is as shown below:
t
RST
WD
RST
RST
0V
TC
=1.1•C•R1(charge time)
(1)=0.51•C•R1
(2)=1000•C•in
: Time required for TC pin potential to rise
1:Time required for TC pin potential to rise
2:Time required for TC pin potential to go
(1)
from 0V V
from V
down from V
t
WD
TH
3(L) to V
t
2
TH
RST
RST
2•
4•
3(L) when Vcc is being applied.
TH
R1 30k
R1
C
(2)
(2) is 830•C.
1000
1000
3(H) to V
R1
R1
TH
Vcc
3(H).
-3
-1
TH
3(L).
(discharge time)
MITSUBISHI
ELECTRIC
4
5
2
5
•Vcc
•Vcc
50µs
PIN 1 (WD PIN)INPUT REQUIREMENTS
(1)Connect capacitor between WD pin and voltage input.
(2)Input cycle:No more than t
C=103
100µs
2.Pin 1 (WD Pin) Input Frequency,
When input to WD pin 1 is normal,TC pin 2 output
waveform is as shown below:
Pin 2 xV
(3)Input pulse width t
t1=C•R1•in
t2=1000•C•in
(Refer to Section 3.)
(Discharge should start before voltage at WD pin
reaches 4V.)
Input Pulse Width,Charge Time and
Discharge Time
Input
C=104
1ms
0.5
ms
1.1•C•R1
DISCHARGE VOLTAGE x(V)
MITSUBISHI<Dig.Ana.INTERFACE>
M5295AL/P/FP
1
t
5-x
3
1000
R1
t1
2•
(charge time)
2
WDIN
t
WDIN
< f
1000
t2
R1
+1
:No more than t2
3
WATCHDOG TIMER
WD
-3
x-5
4
(discharge time)
t1
(
4V
2V
4
(Vcc=5V)
R1=10k
Vcc=5V
/ 8 )
t2