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NJU7291 Datasheet(PDF) 7 Page - New Japan Radio

No. de pieza NJU7291
Descripción Electrónicos  SYSTEM RESET IC WITH WATCHDOG TIMER
PDF  10 Pages
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Fabricante Electrónico  NJRC [New Japan Radio]
Página de inicio  http://www.jrc.co.jp/eng/index.html
Logo NJRC - New Japan Radio

NJU7291 Datasheet(HTML) 7 Page - New Japan Radio

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NJU7291
- 7 -
Ver.2013-08-28
●
CWfor Clock Monitor Time Setting
The CW set the following: “WDT Monitor Time”: TWD.
The TWD is calculated the following.
()
TCWL
TCWH
CW
W
WD
V
V
I
C
T
−
⋅
=
・・
<7>
From formula<7>, CW is calculated as
follows:
WD
TCWL
TCWH
CW
W
T
V
V
I
C
⋅
−
=
・
・
・
・
<8>
The CW value can calculate by the following
formula.The CW Pin Charge Current: ICW is
4
µA (typ.). The CW Pin Threshold Voltage at
WDT Reset: VTCWH is 1V (typ.). The CW Pin
Threshold Voltage at Changing Charge:
VTCWH is 0.2V (typ.).
6
10
5
−
×
×
=
WD
W
T
C
[F] ・・・・・ <9>
The unit of TWDis [s] (second).
The relation between CW and TWD becomes
Fig 3.
―
PRECAUTION ―
The CW discharge time becomes long as with
the increasing of CW as shown in Fig 4. For this
reason, if the CW discharge is not completed
within the TWR, a malfunction occurs in next
watchdog timer operation.
To prevent this malfunction, you should set
the CR value greater than one-fifth of CW value.
0.1
1
10
100
1000
0.001
0.01
0.1
1
10
CW [µF]
Fig 3. WDT Monitor Time(TWD)
vs.
CWfor Clock Monitor Time Setting
RESET
Waveform
CW Pin
Waveform
GND
T
WR
T
WR
(a) at CWfully discharge
(b) at CW faulty discharge
Fig 4. WDT Reset Time (TWR) and CW Pin Voltage Waveform



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