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參數(shù)資料
| 型號： | HA16113 |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | Dual Watchdog Timers |
| 中文描述： | 雙看門狗定時器 |
| 文件頁數(shù)： | 10/18頁 |
| 文件大?。?/td> | 102K |
| 代理商： | HA16113 |
HA16113FPJ
10
External Circuit Constant Calculations (cont)
Item
Equation
Remarks
Voltage at which the
NMI
signal is output when Vout
drops. The
NMI
trigger voltage and
NMI
recovery voltage
can be trimmed by connecting resistors between the
NMI
adj pin and Vout (R1), and between
NMI
adj and GND
(R2).
V
NMI
V = 1.2 1 +
(R1 // 71.7)
(R2 // 25)
NMI recovery voltage
(V high) is:
V high =
86.65
R1
1 +73.8
+
86.65
R1
(R1 and R2 are in k )
Vout
R1
NMIadj
R2
NMI
Vout
NMI
V
NMI
V high
t
V
STBY
(R3 is in k )
V =
71
31.2 + (36.8 // R3)
1 +
1.47
×
Voltage at which the
STBY
signal is output when Vout
drops. The
STBY
trigger voltage can be adjusted by
connecting a resistor (R3) between the
STBY
adj pin and
GND. The
STBY
recovery voltage cannot be adjusted.
Vout
STBYadj
R3
STBY
Vout
STBY
V
STBY
V high
t
WDT.
Line1 =0.31 (Du – 24)
Cf Rf
Line2 = Du (= 25%)*
Line3 =
0.015
Cf Rf
Line4 =
1 – Du
2.1 t
Line5 = 99%
Du is the duty cycle of the P-RUN
pulse.
t
t + t
*
Du =
Note: Line2 and Line5 are fixed.
The watchdog timer function determines whether the P-
RUN pulse is normal or not. A reset pulse is output if P-
RUN is determined to be abnormal. The normal region is
the part bounded by Line1 to Line3 (or Line4) in the
diagram. Line4 applies in certain cases, depending on
C
R
, Cf, and the state of P-RUN.
(Hz)
Line1
Line4
Line5
Line2
Line3
Normal area
Frequency
Duty
(%)
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