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參數(shù)資料
| 型號： | HA16117FPCJ |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | CMOS Watchdog Timer |
| 中文描述： | 看門狗定時器的CMOS |
| 文件頁數(shù)： | 16/31頁 |
| 文件大?。?/td> | 249K |
| 代理商： | HA16117FPCJ |
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HA16117F Series
16
Setting of
RES
Timing and Watchdog Frequency Range
RES
timing requirements. The minimum reset time (t
ON
) required at power-
on (rise of V
CC
) is 20 ms for some MPUs and 100 ms for others.
RES
timing waveform parameters must be selected according to the MPU. With the HA16117F the timing
of the
RES
output and the watchdog frequency range can both be set by external constants (C
F
, C
R
, and K).
Parameters
Item
Symbol
CR (pin 4)
CF (pin 3)
K (pin 8) *
1
Power-on reset time
t
ON
t
OFF
t
RL
t
RH
f
H
f
L
G
Reset-clock off time
G
L
*
2
G
Reset low time
G
Reset high time
G
G
Watchdog frequency high
G
G
Watchdog frequency low
Notes: 1. K = R
2
/ (R
1
+ R
2
)
2. Variability of t
OFF
increases with increasing C
. The variability
t
OFF
is approximately
3.3 (M
)
×
C
F
(
μ
F), so C
F
≤
0.01 (
μ
F) is recommended.
3. External constants should be selected with reference to the formulas in tables 1 and 2.
G
G
G
Table 1
Calculation of
RES
Output Timing
Item
Formula
Notes
t
ON
(ms)
t
OFF
(ms)
t
RL
(ms)
t
RH
(ms)
400 (
)
×
C
R
(
μ
F)
1.99
×
t
RH
(ms)
0.5
×
t
ON
(ms)
t
ON
and t
OFF
can be set independently
t
RL
and t
RH
can be set independently
1.6 (V)
K
×
31 (
μ
A)
15.8 (
μ
A)
×
C
R
(
μ
F)
×
10
3
t
SL
(ms)
≈
t
OFF
(ms)
Table 2
Calculation of Watchdog Frequency Range
Item
Formula
f
H
(MHz)
1
500 (
)
×
C
F
(
μ
F)
t
RH
(ms)
t
RL
(ms)
t
RH
(ms) + t
RL
(ms)
×
f
L
(Hz)
1
1.7 (M
)
×
C
F
(
μ
F)
t
RL
(ms)
t
RH
(ms) + t
RL
(ms)
1
t
OFF
(ms)
×
×
10
3
or
Whichever is larger
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