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參數(shù)資料
| 型號： | HA16129FPJ |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | Single Watchdog Timer |
| 中文描述： | 單看門狗定時器 |
| 文件頁數(shù)： | 8/24頁 |
| 文件大?。?/td> | 135K |
| 代理商： | HA16129FPJ |
HA16129FPJ
8
Calculation Formulas
Item
Formula
Notes
Reference
voltage
Vout = 1.225 1 +
R1, R2; k
37 // R1
12 // R2
(
While the Vout voltage will be 5 V
±
1.5% when the
Voadj pin is open, the circuit shown here should be
used to change the Vout voltage externally.
Voadj
V
CC
CS
Vout
R2
R1
Current
limiter
voltage
V
CS
(150 mV Typ)
<
I
L
· R
CS
When this function operates, the base current to the
external transistor connected to the CS pin stops and
the Vout output is lowered.
V
CC
CS
Vout
R
CS
I
L
OVP
—
This function prevents the microprocessor from being
damaged if the Vout voltage is inadvertently increased
to too high a level. The OVP detection voltage is fixed.
t
RH
, t
RL
t
RH
t
RL
= 3.3
×
C
R
· R
R
= 1.1
×
C
R
· R
R
These determine the reset pulse frequency and duty.
RES
t
RH
t
RL
t
ON
t
ON
= 1.1
×
C
R
· R
T
Sets the time from the rise of the
NMI
signal to the point
the
RES
output is cleared.
NMI
t
ON
RES
t
OFF
t
OFF
= 6.5
×
C
R
· R
R
Sets the time from the point the P-RUN pulse stops to
the point a reset pulse is output.
RES
toff
P-RUN
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