HA16117F Datasheet, PDF(15/31 Page) Hitachi Semiconductor

English

English German Russian Spanish Italian Polish Chinese Japanese Korean French Portuguese	Language :

HA16117F Datasheet, PDF (15/31 Pages) Hitachi Semiconductor – CMOS Watchdog Timer

◁

HA16117F Series

8. Summary of cases where P-RUN frequency fluctuates

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.

â¢ P-RUN normal detection region, duty dependency

100 k

Note: 1

When fP-RUN â¥ 20 kHz,

tOFF is frequency-dependent,

so care is required when

making the P-RUN setting

(see figure below).

10 k

Normal detection region*2

100

P-RUN pulse duty D (%)

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.

â¢ fP-RUN dependency of VCR, tOFF, M

2 Multivibrator threshold voltage (1.6 V)

tOFF

(s)

100 m

50 m

3 k 5 k 7 k 10 k

30 k 50 k 70 k 100 k

P-RUN frequency (Hz)

▷