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HA16117FPC Datasheet(PDF) 15 Page - Renesas Technology Corp

Part # HA16117FPC
Description  CMOS Watchdog Timer
PDF  31 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HA16117FPC Datasheet(HTML) 15 Page - Renesas Technology Corp

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HA16117F Series
Rev.3.00 Jun 15, 2005 page 15 of 30
8. Summary of cases where P-RUN frequency fluctuates
When fP-RUN ≥ 20 kHz,
tOFF is frequency-dependent,
so care is required when
making the P-RUN setting
(see figure below).
1 M
100 k
10 k
1 k
100
10
1
5
4
3
2
1
0
0
50 m
100 m
3
2
M
1
tOFF
(s)
1 k
3 k
10 k
P-RUN frequency (Hz)
30 k
50 k 70 k 100 k
7 k
5 k
050
P-RUN pulse duty D (%)
100
• P-RUN normal detection region, duty dependency
• f
P-RUN dependency of VCR, tOFF, M
Note: 1
Note: 2. This is the region when fP-RUN is constant.
If fP-RUN fluctuates within the normal detection region, the following applies:
Normal detection is performed when the condition fP-RUN H/fP-RUN L < M is satisfied.
If there is a double-pulse in P-RUN,
RES may be output if the double-pulse has multiple frequency
components. If the P-RUN frequency fluctuates, refer to the following when making the P-RUN
setting.
Multivibrator threshold voltage (1.6 V)
Normal detection region*2



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