HA16117 View Datasheet(PDF) - Hitachi -> Renesas Electronics

Part Name

Description

View to exact match

HA16117

CMOS Watchdog Timer

Hitachi -> Renesas Electronics 

HA16117F Series

6. When P-RUN frequency fluctuates (1)

If there is a double-pulse in P-RUN, the WD filter duty will be decreased and RES will be

output, as shown in the figure below, for example. In this case, the condition for non-output of

the RES signal is a value of 3 or less for the ratio of P-RUN pulse interval minimum value to

maximum value (when fP-RUN ≤ 20 kHz). This is because the CR pin charge/discharge current

ratio is 3.

H

P-RUN

L

H

Q

L

H

Q

L

H

A

L

5V

3.6 V

CF

0.9 V

0V

H

WD

L

5V

3.2 V

CR

1.6 V

0V

H

B

L

H

C

L

H

RES

L

2 ms

28 ms

20 ms

13

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