參數(shù)資料
型號(hào)： HA16129FPJ
廠商： Hitachi,Ltd.
英文描述： Single Watchdog Timer
中文描述： 單看門狗定時(shí)器
文件頁(yè)數(shù)： 6/24頁(yè)
文件大?。?/td> 135K
代理商： HA16129FPJ
HA16129FPJ
6
Function Start Voltage
This is the minimum required Vout voltage for the
RES
,
NMI
,
STBY
, and OUTE output pin functions to
start operating. It is stipulated as the voltage that Vout must reach after power is first applied for these pins
to output a low level.
Hysteresis
This is the difference between the LVI function detection voltage when the power-supply voltage drops,
and the clear (reset) voltage when the power-supply voltage rises.
(V
HYSN
= V
NMI
' – V
NMI
; V
HYSS
= V
STBY
' – V
STBY
)
OUTE Function
When a microprocessor is in the runaway state, its outputs are undefined, and thus it is possible that the
outputs may be driven by incorrect signals. This function is used to mask such incorrect microprocessor
outputs. When the WDT function recognizes normal operation (when the
RES
output is high), the OUTE
output will be held high. When the WDT function recognizes an abnormal state and an auto-reset pulse is
output from the
RES
pin, the OUTE output will be held low. Thus microprocessor outputs during
microprocessor runaway can be masked by taking the AND of those outputs and this signal using external
AND gates.
The OUTE output will go high when the C
R
pin voltage exceeds VthHcr2, and will go low when that
voltage falls below VthLcr.
There are limitation that apply when the OUTE function is used. Refer to the calculation formulas item for
details.
RES Function
t
RH
This period is the length of the high-level output period of the
RES
pulse when the P-RUN signal from the
microprocessor stops. This is the time required for the C
R
potential to reach VthLcr from VthHcr1.
t
RL
This period is the length of the low-level output period of the
RES
pulse when the P-RUN signal from the
microprocessor stops. This is the time required for the C
R
potential to reach VthHcr1 from VthLcr.
t
OFF
This is the time from the point the P-RUN signal from the microprocessor stops to the point a low level is
output from the
RES
pin. During normal microprocessor operation, the potential on the C
R
pin will be
about Vout – 0.2V (although this value may change with the P-RUN signal input conditions, so it should be
verified in the actual application circuit) and t
OFF
is the time for the C
R
pin potential to reach VthLcr from
that potential.
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